14 best house electric tankless water heater

A house electric tankless water heater, also known as an electric on-demand water heater, is a type of water heating system that provides hot water for various household needs without the use of a traditional storage tank. Here's what you need to know about these appliances:

  1. Operation: Unlike traditional tank water heaters that store and constantly heat a large volume of water, tankless electric water heaters heat water only when it is needed. When a hot water tap is turned on in the house, cold water flows through the unit, where it is rapidly heated by electric heating elements, providing hot water almost instantly.

  2. Energy Efficiency: Electric tankless water heaters are known for their energy efficiency. They only use electricity when hot water is in demand, reducing standby heat loss associated with tank-style water heaters. This can lead to energy savings and lower utility bills.

  3. Space-Saving: Tankless water heaters are typically more compact than traditional tanks, making them suitable for smaller spaces. They can be mounted on walls or installed in tight spaces, freeing up valuable floor space.

  4. Endless Hot Water: One of the main advantages of tankless water heaters is their ability to provide a continuous supply of hot water. As long as there is a demand for hot water, the unit will keep heating it, making them ideal for households with high hot water usage.

  5. Flow Rate: The flow rate of a tankless water heater determines how much hot water it can produce at a given time. Different models offer various flow rates, so it's essential to choose a unit that meets the hot water demands of your household.

  6. Installation: Installing an electric tankless water heater may require electrical work and plumbing adjustments.It's advisable to have a professional plumber or electrician handle the installation to ensure it's done correctly and safely.

  7. Maintenance: Electric tankless water heaters generally have lower maintenance requirements compared to tank-style heaters. Regular flushing to remove mineral deposits may be necessary, depending on your water quality.

  8. Cost Considerations: While tankless water heaters can be more energy-efficient in the long run, they often have a higher upfront cost compared to traditional tank-style heaters. However, energy savings over time can offset the initial investment.

  9. Temperature Control: Most electric tankless water heaters offer precise temperature control, allowing you to set the desired water temperature to meet your specific needs.

It's important to choose the right size and model of electric tankless water heater to match your household's hot water demands. Factors such as climate, incoming water temperature, and simultaneous hot water usage should all be considered when selecting a unit. Additionally, local building codes and regulations may affect the installation and use of tankless water heaters in your area, so it's advisable to consult with a professional before making a purchase.

Below you can find our editor's choice of the best house electric tankless water heater on the market
  

EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology

EcoSmart

Based on 2 reviews Check latest price

Product description

This Smart Technology electric tankless water heater is configured as a "whole home" model for climates where incoming water temperature is 67°F and above. This model is well suited for heating up to 2-Gallon per minute, which is the equivalent of one shower head (with a 1.5 gpm flow) and one sink with a low inlet water temperature of 67°F and an output setting of 105°F. Digital Temperature Control allows you to set your temperature in increments of 1 Degree. This model can also be used in colder climates as a Point of Use for a sink or other low flow application. All tankless water heaters are sized based on flow rate and temperature rise, and there is a direct relationship between the two. So if used in a cold area requiring a high temperature rise, it will be more limited in the amount of fixtures (gallons per minute) it can heat at one time compared to a warmer climate. When sized properly this water heater will provide endless hot water and only consume the energy needed, giving the user complete control. Prior to purchase and installation please verify this model is the right size for the expected demand and electrical requirements. The ECO 11 requires a minimum 125 amp electrical panel for installation with 60 amp double pole breaker connected to set of #6 awg wire. Plumbing connections are 1/2" compression fitting with the option of 1/2" NPT adapter included. For additional assistance please feel free to contact our support center at 877-474-6473.



NOTE : 11Kw at 220 is equal to 13kw at 240. .Activation Flow : 0.3 GPM

From the Manufacturer

This Smart Technology electric tankless water heater is configured for climates where incoming water temperature is 67 Degree F and above. This model is well suited for heating up to 2-Gallon per minute, which is the equivalent of one shower head (with a 1.5 gpm flow) and one sink with a low inlet water temperature of 67 Degree F. Digital Temperature Control allows you to set your temperature in increments of 1 Degree. This model can also be used in colder climates as a Point of Use for a sink or other low flow application. Prior to purchase and installation please verify this model is the rights size for your hot water needs and electrical requirements.

  • Lifetime warranty
  • Save up to 60-percent on your water heating cost with an ECOSMART electric tankless water heater
  • Never run out of hot water with an ECOSMART tankless water heater
  • Patented Self Modulating Technology and design
  • ECOSMART tankless water heaters are 99.8-percent energy efficient.Uniform Energy Factor:0.98

User questions & answers

Question: Ours has only been in service for less than a year - will not adjust temperature to anything above 85 Deg. F. What do you think is the problem ? kds
Answer: My only guess is that the rheostat (variable resistor) that the temperature adjustment knob is attached to may be faulty. If that isn't it then I don't know. Sorry.
Question: The warrenty says that this unit must be installed by a licensed electrician and plumber, for them to honor the "life time warrenty." why
Answer: Hello Bob, The reason is the same as why an innumerable number of gadgets around the world have that little "warranty void if removed" label. Because getting inside of one requires a certain level of training and expertise. Same with this unit. GadgetsGo is an authorized Ecosmart dealer. Kind regards,HenryGadgetsGo
Question: My house is wired 110V. What additional items do I need to purchase for the conversion
Answer: Just to expand slightly on prior answers, normally a residential service feed is 240 volts between the two incoming hot legs. There is also a neutral leg, which (hopefully) has zero potential with reference to ground. The voltage between either one of the hot legs and the neutral leg is 120 volts. The 120 volt circuits in your house are connected to one or the other of the two hot legs, and only one. An attempt is made to assign circuits to the two hot legs in a way that will roughly balance the load between them. The other side of a 120 volt circuit is connected to the neutral leg. There is additionally a safety ground run with the circuit, which also ties into the panel. Certain devices require more power (work product of current and voltage) than is practical to deliver using a 120 volt circuit. Common examples are your clothes dryer, and your electric stove. These devices are powered by both hot legs, with a difference in potential of 240 volts. This water heater is also such a device.STRONG BUT FRIENDLY WARNING: If you did not already know this, please don't make wiring this water heater your learning opportunity with electricity. Hire someone who knows how to do it right. Cutting corners, especially with higher currents and voltages, can lead to equipment damage, fire, and electrocution. Electricity is not magic, and you can certainly learn how to do many common wiring tasks safely on your own, but today is not the day to begin that journey. You need properly sized components, properly installed, and connected to an adequate service. Also, if you really, really foul up, you could conceivably wind up making that morning shower more energizing than you ever imagined, if you get what I mean. So newly aspiring electricians should go fix their grandmother's favorite table lamp instead. Once they have that working they can use it to to start reading books about electricity, residential wiring, and eventually, books about this stuff: http://amazon.com/s/ref=nb_sb_ss_c_0_8?url=search-alias%3Dstripbooks&field-keywords=nec+code&sprefix=nec+code%2Caps%2C164 . Of course, you still have to know not to nick conductors when you strip them, and other trade craft like that ; ) . Like almost everything in life that is fun, electricity will hurt you. Sort of like all those people you dated for a while, and then wished later you had never met.
Question: what amp breaker is required
Answer: The National Electrical Code requires conductors and overcurrent protection to be sized at 100% of the manufacturer's branch circuit recommendation for tankless electric water heaters. A 60 amp breaker is the same price as a 40 or 50, it is the wire that costs more. #6 AWG wire is required for a 60 amp circuit. If you undersize the wire it could overheat and catch fire. Protect your family and follow the manufacturer's sizing for this, or any other, electrical device. Your family's lives are worth the extra money. 

Product features

3 Smart Steps for Endless Hot Water

Step 1: Determining your average inlet water temperature is important, this allows you to determine how well your unit will perform in your desired location. A lower inlet water temperature will require a higher kilowatt product.

Step 2: Next you will determine how many applications your unit can run simultaneously at your chosen location inlet water temperature. Tankless electric water heaters are sized for maximum simultaneous use, not maximum fixtures in your home.

Step 3: Determining specifications and electrical infrastructure is important because without the correct infrastructure your unit may not fit into your breaker panel.

Ecosmart ECO 36 36kw 240V Electric Tankless Water Heater

Based on 313 reviews Check latest price

Product description

Eco Smart ECO 36 Electric Tankless Water Heater, 36 KW at 240 Volts with Patented Self Modulating Technology Why Eco Smart? If you have a need for a high amount of hot water then the ECO 36 is the right choice. The ECO 36 is the largest electric tankless water heater available with our patented self-modulating technology. This smart technology tankless water heater is ideal for the northern United States, where incoming water temperatures can reach as low as 37 degrees F. The ECO 36 is capable of heating nearly 3.5 gallons per minute at this low temperature. To put that into perspective, it can handle up to two showers running at the same time and never run out of hot water. For homes in the southern United States, the ECO 36 is perfect for large Roman-style and Jacuzzi tubs or high demand of hot water between multiple applications. It can handle up to 6 gallons per minute, which means you can run four showers and a sink simultaneously and never run out of hot water. A digital temperature control allows you to set your temperature in increments of 1 degree, so you can set the temperature to how you like it. The ECO 36 is the most powerful model from our full line of tankless water heaters, with the capacity to handle a large single-family home.Take a look at our full line of tankless water heaters below to see what's perfect for you. THIS MODEL REQUIRES 150 AMPS DEDICATED!. Required Wire: 4 x 8 AWG

From the Manufacturer

Ecosmart ECO 36 Electric Tankless Water Heater, 36 KW at 240 Volts with Patented Self Modulating Technology Why EcoSmart? If you have a need for a high amount of hot water then the ECO 36 is the right choice. The ECO 36 is the largest electric tankless water heater available with our patented self modulating technology. This smart technology tankless water heater is ideal for the northern United States, where incoming water temperatures can reach as low as 37 degrees F. The ECO 36 is capable of heating nearly 3.5 gallons per minute at this low temperature. To put that into perspective, it can handle up to two showers running at the same time and never run out of hot water. For homes in the southern United States, the ECO 36 is perfect for large Roman-style and Jacuzzi tubs or high demand of hot water between multiple applications. It can handle up to 6 gallons per minute, which means you can run four showers and a sink simultaneously and never run out of hot water. A digital temperature control allows you to set your temperature in increments of 1 degree, so you can set the temperature to how you like it. The ECO 36 is the most powerful model from our full line of tankless water heaters, with the capacity to handle a large single-family home. Take a look at our full line of tankless water heaters below to see whats perfect for you. THIS MODEL REQUIRES 150 AMPS DEDICATED!

  • Sleek and compact design with digital output temperature display
  • ECOSMART tankless water heaters are 99.8-percent energy efficient
  • Manufactured in United States
  • Pipe Fittings:3/4 inch NPT
  • Required Breaker:4 x 40 A
  • 150 A

User questions & answers

Question: What model is recommended for whole house
Answer:
Question: I live in lower michigan and what model is recommended for whole house
Answer:
Question: Why are these so much less expensive than other name brand tankless heaters
Answer:
Question: Even with 200 amp. My lights flicker with the water is in use. Any one having the same issue and how was the issue resolved? Thanks
Answer:

Product features

3 Smart Steps for Endless Hot Water

Step 1: Determining your average inlet water temperature is important, this allows you to determine how well your unit will perform in your desired location. A lower inlet water temperature will require a higher kilowatt product.

Step 2: Next you will determine how many applications your unit can run simultaneously at your chosen location inlet water temperature. Tankless electric water heaters are sized for maximum simultaneous use, not maximum fixtures in your home.

Step 3: Determining specifications and electrical infrastructure is important because without the correct infrastructure your unit may not fit into your breaker panel.

Rheem RTEX-18 18kW 240V Electric Tankless Water Heater, small, Gray

Rheem

Based on 466 reviews Check latest price

Product description

This water heater offers quick, continuous hot water that is on demand for single point-of-use or multiple applications.Robust copper immersion heating elements with brass top increases durability and are threaded for easy replacement. Digital temperature control allows you to set your temperature in increments of 1°

  • External digital thermostatic control with LED display (+/1 degree accuracy)
  • Most advanced self-modulation, adjust power to meet hot water demand
  • Durable Copper immersion two heating elements, field Serviceable. Flow Rate- up to 4.4 GPM
  • Simple installation – bottom 3/4 inch NPT water connections
  • Threaded for easy replacement, simple installation, digital temperature display

User questions & answers

Question: Can this be used in a recirculating system
Answer: No where on the box does it say contains copper. Box reads.... 100% nonstick surface - hand washable and dishwasher safe- PFOAF Free, PTFE- fiberglass coating, safe up to 500 degrees, FDA approved. We are happy with our purchase.
Question: How many amps
Answer: Of course it can.
Question: how many breakers and what amp
Answer: No
Question: will this supply two showers, washer and dishwasher for two people? (1000 sf house
Answer: Made in China

EcoSmart ECO 27 Electric Tankless Water Heater, 27 KW at 240 Volts, 112.5 Amps with Patented Self Modulating Technology,White

EcoSmart

Based on 3 reviews Check latest price

Product description

Configured for cold climates or high flow rates. Well suited where incoming water temperature can drop below 45 F. For use in more demanding water usage applications. Self modulating flow sensor technology regulates the amount of energy required to heat the water needed. Digital temperature display showing the outlet water temperature setting. Uses 9 KW standard Emerson electric heating elements with brass tops to prevent electrolysis. Copper heat exchanger. Automatic resettable thermostat. 40 DP breakers required. 112A draw. Required wire: 3 sets 8 AWG. Pipe fitting: 3/4'' NPT. Energy efficiency: 99.8%. UL and CSA certified.Weight: 11 lb. Lifetime warranty. It can provide between 2.7 and 6.5 gallons-per-minute depending on the inlet water temperature.

From the Manufacturer

This Smart Technology electric tankless water heater is configured for climates where incoming water temperature can reach as low as 37 degrees. The ECO 27 is capable of heating nearly 3 gallons per minute at this temperature. The ECO 27 is the largest electric tankless water heater available with Patented Self Modulating Technology. This model is well-suited for homes in the northern U.S., Canada, and in the southern U.S. for large Roman-style or Jacuzzi tubs that generally have more demanding water usage needs. Digital temperature control allows you to set your temperature in increments of 1 degree. Prior to purchase and installation please verify that this model is the right size for your hot water needs and electrical requirements.

  • Savings of up to 50% on water heating costs. Dimensions :17H x 17W x 3.625D inches ;Pipes fittings :3/4 inch NPT
  • Digital temperature control in 1-degree increments allows control of hot water; Activation Flow: 0.3 GPM
  • Copper and stainless components designed for efficiency, durability and easy replacement.
  • Compact size saves valuable storage space, while the stylish and advanced design is pleasing to the eye and Copper and stainless components designed for efficiency, durability and easy replacement.
  • Prior to purchase & installation, please verify that this model is the right size for your hot water needs and electrical requirements. Electrical requirements: 27 kW, 240 volts, 40 required breakers, 112.5 maximum power (AMP), 8 required wire.Amperage Draw:113 A
  • Required Breaker Quantity: Three 40 Amp Double Pole
  • Recommended Electrical Panel: 200 Amps

User questions & answers

Question: How do know which size to buy? We will supply two bathrooms, dish washer, clothes washer. What size should I choose
Answer: In order to have a 208 volt power you would need to be pulling off of 2 legs of a 3 phase service. Are you sure you have 3 phase?
Question: Can this unit supply a 3,700 sq foot home with 3 1/2 baths
Answer: Approx 7x11. The cover is approx 8x12
Question: What is the power consumption of this tank-less heater
Answer: This is a 240V/208V heater. At 240V this heater draws 6.25 amps.
Question: remote
Answer: Are you asking if it can be wired 208 volt? The answer is yes. I don't have any experience with model you are referring to otherwise.

Product features

3 Smart Steps for Endless Hot Water

Step 1: Determining your average inlet water temperature is important, this allows you to determine how well your unit will perform in your desired location. A lower inlet water temperature will require a higher kilowatt product.

Step 2: Next you will determine how many applications your unit can run simultaneously at your chosen location inlet water temperature. Tankless electric water heaters are sized for maximum simultaneous use, not maximum fixtures in your home.

Step 3: Determining specifications and electrical infrastructure is important because without the correct infrastructure your unit may not fit into your breaker panel.

Rinkmo Electric Tankless Water Heater 18KW 240V Instant Hot On Demand Residential Electric Water Heater for Bathroom Bathtub rv Whole House Shower Sink Small

Based on 113 reviews Check latest price
  • 🚿【TIPS】Please notice that the 18KW tankless water heater requires 2 x 40 AMP breakers and 2 x 8 AWG wire, the Min. Water Flow is 0.4GPM/1.5L/min. The 24KW tankless water heater requires 3 x 40 AMP breakers and 3 x 8 AWG wire, and the Min. Water Flow is 0.66GPM/2.5L/min.
  • 🚿【Save Money Save Cost】No need to preheat before using instant tankless water heater. After using our Rinkmo high efficient water heater, you will find your water Heating Costs Reduce Up to 60%, due to our heater is 99.8% Energy Efficient, you can get hot water within 3s; Create heat without direct contact with metals,No mineral buildup so you don't need to maintenance or fix it and replace the heater coils, No expensive maintenanc cost in the future.
  • 🚿【Stable Water Temp for Whole House 】Our smart modulating technology and formula to calculate the difference between the desired temp and current temp, adjusts power input based on flow rate and temp setting in real time by our temp sensors and flow sensors. No sudden temp changes.
  • 🚿【Stable Water Temp for Whole House】Our smart modulating technology and formula to calculate the difference between the desired temp and current temp, adjusts power input based on flow rate and temp setting in real time by our temp sensors and flow sensors. No sudden temp changes.
  • 🚿【Compact Size Save Space】Rinkmo water heater only like a small suitcase, save your space and giving more to your living area. Easy to install and operation, set temp by turning the button, press the button to switch between Fahrenheit/ Celsius.

Product features

Rinkmo Electric Tankless Water Heaters Help You

Rinkmo has developed a new line of more efficient electric tankless water heaters within 3 years, which with improved design and state of the art technology.

It is a new generation of instant and efficient electric tankless water heaters, safe, efficient and cost effectiveness never before obtainable. Radically solve the problems.

You can install it anywhere hot water is needed.

Rinkmo always cares what consumers care about.

No Worry

Approved.

No above bad things happened under Rinkmo, you can enjoy your life without this terrible things even you have hard water.

Endless Hot Water

Not worry about the hot water even you have a long shower time.

No need to preheat, 3s you can get the hot water you want, no annoying delay and cold water.

Just turn on the tap or shower.

It can run both of our showers and dishwasher/washing machine without issue, up to 3 x faucet, 2 x shower at the same time.

Well suited also good for homes in the Northern U.S. and Canada or in the southern U.S. that have large Roman-style or Jacuzzi tubs that have generally more demanding water usage needs.

Get Comfortable Experience

Rinkmo use high quality temperature sensors and smart flow sensors, it is very important for our using experience.

So you can still get stable temperature water instead of scalding hot water, when you reduce flow rate or low water pressure.

The water temperature will not fluctuates anymore when you take shower and bathe baby.

-Auto protection: when it is detected that the outlet temp reaches 167 ° F (75 ° C) ,the system immediately cuts off heating for safe.

-Temperature abnormal reminder: The display will alarms if the inlet water temp <37° F, or the outlet temp >167° F

Fundamentally Solve Customer Problems

TURELY SAFE compared to other Traditional electric water heater or storage water heater.

Note

18kw Electric Tankless Water Heaters need:

Breaker:2x40AMP

Cable: 2x8AWG

Volts:240/208

Compact Design

Save space design, allows you install it in non-traditional spaces such as the utility room, basement, garage, attic, crawl space or even a closet.

Easy to read digital temperature display, no any complicated requirements for installation without minimal noise output.

Size: 18x14x3.7in

Weight: 11.2lb

Well sealed packaged that you can get a intact product, no any dented or damage.

Save Money Save Time

1. Compared to traditional tanks water heater:

Rinkmo instant Electric Tankless Water Heater only turn on when you need hot water, reduce the store heat loss, saving up to 50% in water heating costs, and you can get the fresh water.

2. Compared to other Electric Tankless Water Heater:

Totally solve most of safe problem and high maintenance costs, more cost-effective under our Original Water Pipe and Electricity Heating Separate tech:

304 stainless steel water pipe, healthy.

No mineral builup, no need to clean it.

No dirty water

You don't need to ask a plumber to repairing machine multiple times.

Real savings for your future cost, time and money.

Good for Other Commercial Places

Rinkmo Electric Tankless Water Heater not only for home use, but also for many other commercial places where need instant, endless and safe hot water, such as: apartment, barbershop, hotel, beauty salon, gym center, restaurent and so on.

More Smart Design:

-High quality sheet metal shell, fireproof

-Screen shows actual outlet water temperature clearly instead of the setting temp, safer

-Machine will auto stop if no water be heated.

-Adapt to 2 voltages: 240V/208V both ok, just 1 button to set it when install

-Cleanable filter

First, before order unit, you need to check below things:

Determining your average inlet water temperature is important, this allows you to determine how well your unit will perform in your desired location.

Second

Next you will determine how many applications your unit can run simultaneously at your chosen location inlet water temperature.

Third

Next you need determining specifications and electrical infrastructure.

Sio Green SIO18-220v/80A/18kW -Infrared Electric Tankless Water Heater - Instant Hot Water Heater - Corrosion Free - Free Maintenance

Based on 85 reviews Check latest price

Product description

Did You Know That A Tank Less Electric Water Heater Could Save You Thousands Of Dollars In The Long Run? Looking for a cost-effective, practical and heavy-duty hot water heater for your home? Want to cut down on maintenance costs and enjoy hot water anytime you need it? Why settle for cheaply-made tank-less water heaters, when you can have the smartest and most innovative tankless electric heater? Introducing The Sio Green Sio18 80A/18kW Whole House Infrared Electric Tankless Water Heater! If you are building a new home or renovating your house, then you need to consider a budget-friendly alternative to all those water heaters that require thousands of dollars in maintenance each year. With the Sio Green tankless heater that utilizes Far infrared ray and quartz elements, you don’t have to worry about maintenance costs, since you will have: NO Corrosion – since no metal parts come in contact with water NO Calcium Deposits – which is ideal for hard water areas NO Flimsy Coil Metallic Elements – which means NO maintenance costs NO Bulky & Impractical Heaters In Your Home – our tankless heater is as large as a shoe box. Why Choose Our Environmentally-Friendly & Cost-Effective Water Heater? Save Your Time & Effort Enjoy Maximum Operational Longevity Save Your Precious Utility Room, Kitchen Or Bathroom Space Cut Down On Maintenance Costs Adjust It To Your Family’s Exact Needs Super-Easy To Install Don’t Hesitate! Check out your home area and choose the ideal tankless water heater for your home! Indulge Yourself! Click “Add To Cart” NOW & Get Your Sio Green Premium Infrared Water Heater 100% RISK-FREE 30 Days Return from Amazon.

  • ✔HOT WATER ANYTIME YOU WANT WITHOUT ANY HASSLE! The Sio Green premium tankless water heater is here to help you enjoy your hand wash or wash the dishes with warm water anytime you want without any fuss. The infrared heating design will heat ONLY the water you use, thus allowing you to save time and money!
  • ✔PATENTED TECHNOLOGY, NO COIL METALLIC ELEMENTS, NO CORROSION, NO MAINTENANCE! That’s right! Our tankless hot water electric heater will create heat without direct contact with metals, which will in turn prevent corrosion, limescale deposit and calcium buildup. As a result, you will have to spend $0 on maintenance or replacements!
  • ✔SAVE YOUR BATHROOM OR KITCHEN SPACE WITH OUR COMPACT WATER HEATER, which is not only ideal for small bathrooms, kitchens or cabinets, but can be also installed easily. The ergonomic size and simple yet innovative construction will allow you to install it almost anywhere, including hotels, stores or restaurants!
  • ✔ADJUST IT TO YOUR EXACT NEEDS EFFORTLESSLY! Our electric tankless hot water heater features Automatic Power Technology so you can easily tailor its performance to your family’s needs and saving the energy and only use what you need, which is ideal for any home application.
  • ✔100% SATISFACTION OR YOUR MONEY BACK! That’s our guarantee! If you are not 100% satisfied with your budget-friendly, space-saving and ultra-practical tankless water heater within 30 days, we will offer you a refund or a replacement. No questions asked! What are you waiting for? Get yours now while supplies last!

Product features

The benefits of Quartz Elements

No more routine flushing to maintain some level of the efficiency and since you don’t have to replace the heating elements periodically, it will save you both time and money!

No Corrosion & No Calcium Deposits

The systems energize your water with quartz elements that create heat without requiring direct contact of metal for heating with the water and minimizes your chances of corrosion accumulating in the water.

Automatic Modulating Technology

In Automatic mode, the software is using smart modulating technology and formula to calculate the difference between the desired temperature and current temperature, then predicts how much power it requires to ensure the process temperature remains as close to the set point as possible.

Temperature Adjustment

Our premium Sio18 designed for high performance usage in Residential operating 24h/a day for 365 days a year.

Check Specifications

SioGreen products must be installed by a licensed and qualified electrician in accordance with all applicable national, state, and local electrical codes depending on country. Before installing this product, ensure that the home has sufficient electrical power available to handle the maximum amperage load of the applicable model.

1) FIND YOUR LOCATION ON THE MAP AND NOTE YOUR THE INLET COLOR REGION

Manufacturer Cover: This unit is qualified One-to-One Replacement Cover service contract (“Replacement Cover”) provides for the replacement of the Product purchased by you if found to be defective during the term of two year(s) from the date of purchase. When the Product failure occurs due to an electrical or mechanical defect, You will receive a replacement product of like kind, quality and value (same condition). Once the Product has been replaced, the cover will carry on the rest of the period from the date of original purchase. Notwithstanding the foregoing time period, the Heat Exchanger portion of the product shall have an additional Eight year limited cover beginning at the expiration of the above two year One-to-One Replacement Cover. This means that, the Product will have a total cover of ten (10) years stated from the date of Sales Invoice/Receipt of the Product, subject to payment of the applicable fee, shipping fee for the Replacement Cover selected. Contact SioGreen to execute this Replacement

Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray

Rheem

Based on 257 reviews Check latest price

Product description

This water heater offers quick, continuous hot water that is on demand for single point-of-use or multiple applications.Robust copper immersion heating elements with brass top increases durability and are threaded for easy replacement. Digital temperature control allows you to set your temperature in increments of 1°

  • ON/OFF Dial Control with adjustable digital temperature display
  • Self-modulating power control
  • 24kW Model Flow Rate: up to 5.9 GPM for RTEX-24
  • Bottom 3/4" NPT water connections
  • On demand, consistent and continuous hot water

User questions & answers

Question: Can this directly replace a 40 gal tank heater with a 30A double pole breaker? What are power requrements
Answer: No it can't. RTEX-24 requires 3 sets of wire and ground, and it needs 3x 40amp breaker. That's a total of 120amps
Question: Can you use the 10/3 for one of the cicuits
Answer: No. It requires three legs of 8-2.
Question: Can the unit operate as a rtex-18 if i only hook up 2 of the elements? because i only need the 18 specs as of now but would like the option to upgrade
Answer: Actually you can do this but you must be careful on which circuits are connected. Rheem says the elements are activated from right to left as power is required. The right most element connection also provides power to the control so this must always be connected. If the very left element is left disconnected, you will only get 2/3 of the rated power on a 3 element unit.
Question: Why are 2 answers for the breaker requirements. Is it 3 double 40 or 3 double 60 amp
Answer: If the unit draws 40 amp. you need a 2 pole 40 amp breaker 2 #8 wires good for 40 amp and 1 # 10 wire for a bond. Now if the unit draws 60 amps you need 2 # 6's good for 65 amps. A 2 pole 60 amp breaker and 1 # 8 for a bond( ground wire).

Product features

Rheem 240V 3 Heating Chambers RTEX-24 Residential Tankless Water Heater

Professional Classic tankless electric water heaters offer continuous hot water quick and on demand for single point-of-use or multiple applications.

Performance Features

  • On demand, continuous hot water
  • Compact and stylish with digital temperature control in increments of 1°F ranging from 80°F to 140°F
  • 99.8% Energy efficient
  • Robust copper immersion heating elements with brass top increases durability and are threaded for easy replacement
  • Simple Installation
  • Digital temperature display

Applications

  • Standard Hand Sink – 0.5 GPM
  • Washing Machine – 1 to 1.5 GPM
  • Kitchen Sink – 1 to 2 GPM
  • Dishwasher – 1 to 2 GPM
  • Water-Saver Shower Head – 1.5 GPM
  • Standard Shower Head – 2.0 GPM
  • Bath Tub – = 4 GPM
  • Whole-Home – up to 6 GPM

Average Gallons Per Minute (GPM) based on 2010 Plumbing Standards.

Unique Features

  • External Digital Thermostatic Control with LED display (+/- 1 degree accuracy)
  • Most advanced self-modulation, adjust power to meet hot water demand
  • Durable Copper Immersion three heating elements, field serviceable
  • Simple Installation – Bottom 3/4"NPT water connections

Eemax EEM24018 Electric Tankless Water Heater, Blue

Based on 107 reviews Check latest price

Product description

Eemax electric tank less water heaters provide endless hot water where you need it and when you need it. This product can be used for any of your residential or commercial water heating needs. The EEM24018 is a 240 volt, 18 kilowatt unit. It can produce enough hot water for up to 1 shower and 2 sinks simultaneously in colder climates. In warmer climates it can produce enough hot water for up to 4 Showers or sinks simultaneously.

  • Tankless water heaters provide a continuous Supply of hot water and only heats the water you need, when you need it
  • Instant, consistent and endless hot water
  • The most advanced, self-modulating technology available, meaning the unit will adjust how much energy needs to be input based on how much hot water is needed
  • Compact size saves valuable storage space; Resistant and stylish with digital temperature control in increments of 1°F ranging from 80°F to 140°F
  • Before purchase and installation, Please verify that this EEM24018 is the correct size for your hot water needs.Rated Pressure: 25psi minimum; 150psi maximum

User questions & answers

Question: Can i feed this water heater from two 40 amps brakers both conected to one phase, or should i put other braker to other (leg) phase
Answer: this heater uses (2) two pole 40 amp breakers NOT (2) single pole 40 amp breakers
Question: If i already have a 6/2 wire can i still use that wire on as one of the 40 AMP double pole breaker
Answer: Yes. You can. But you still have to put another pair with another 40 amp breaker next to it.
Question: Can this be used to heat an above ground pool
Answer: not really search for HEAT PUMP pool heater
Question: Will this work in a European country (European voltage
Answer: Not sure of European voltage? It takes FOUR 40 amp breakers to operate it. I used number 8 wire. Wired direct to breaker panel and no plug or receptacle needed. This makes the 4th one I have installed and will be replacing all the water heaters with these as soon as the ones in my rental go out.

Stiebel Eltron Tankless Water Heater – Tempra 24 Plus – Electric, On Demand Hot Water, Eco, White, 20.2

Stiebel Eltron

Based on 616 reviews Check latest price

Product description

"The Stiebel Eltron Tempra 24 Plus Tankless Water Heater features exclusive Advanced Flow Control German patented technology invented by Stiebel Eltron to automatically maintain water temperature for constant comfort. It’ll reduce flow slightly if hot water demand exceeds capacity to ensure that hot showers will never be interrupted. Tempra 24 Plus will typically use 15-20% less energy compared to conventional electric tank water heaters. Although, it’s possible to save significantly more energy depending on personal home usage habits. The difference is that conventional tank water heaters continually store hot water, and as a result, lose 15%-20% of the total energy consumed to the environment around them. This is called standby heat loss. Tank water heaters that use gas or oil are even less efficient, because they also lose heat through their vents to the outdoors. Our tankless water heaters do not need venting, and will not store hot water, waiting for you to use it. They operate on-demand to provide continuous and endless hot water when you need it, and not waste energy when you don’t. CERTIFICATIONS INCLUDE - ANSI/UL Std. 499, CSA Std. C22.2 No. 88, ISO 9001, WQA tested & certified against NSF/ANSI 372 for lead free compliance. TECHNICAL SPECIFICATIONS – Single Phase 50/60 Hz; Voltage: 240 V/208 V; Wattage: 24 KW/18 KW; Min. recommended household electric service 150 A; Amperage draw: 2 x 50 A 2 x 44 A; Number and min. recommended size of circuit breakers: 2 x 50 A (DP); Number of runs and min. recommended wire size (copper): 2 x 6/2 AWG; Max. temperature rises: 92 F/82 F at 1.50 GPM, 73 F/54 F at 2.25 GPM, 54 F/41 F at 3.00 GPM, 37 F/27 F at 4.50 GPM; Min. water flow to activate unit: 0.50 GPM/1.9l/min; Weight: 16.1 lb/7.3 kg; Nominal water volume: 0.26 gal/1l; Max. inlet water temperature: 131 F/55 C; Working pressure: 150 PSI/10 BAR; Tested to pressure: 300 PSI / 20 BAR; Water connections: 3/4"" NPT."

  • CONTINUOUS FLOW – Advanced Flow Control patented technology invented by Stiebel Eltron, automatically maintains water temperature for constant comfort. It’ll reduce flow slightly if hot water demand exceeds capacity. Hot showers will never be interrupted again
  • SPACE & ENERGY SAVER – Its small, sleek white design saves space yet still provides endless hot water for your whole house, and no venting is required. Eco friendly unit saves energy with auto-modulation and the ability to electronically control water flow. Savings monitor even shows how much you save on energy costs
  • EASY OPERATION – Electronic switch activates the hot water heater and it’s noise free while in use. Has a digital temperature display and preset temperature and memory buttons, while the interior solid copper heating system does all the power work
  • TEMPRA 24 PLUS – This specific model is 24kW, 240V, requires a min recommended electric service of 150 A, and offers an output water temperature of 68° to 140°F. Check our guides below to compare features of our various Trend and Plus models, each available in different kW levels
  • WARRANTIES INCLUDED – Stiebel Eltron’s top-rated electric tankless water heaters perform with the highest standards for comfort and reliability. Our 7-Year Leakage and 3-Year Parts Warranties are included with purchase

User questions & answers

Question: How can i make tempra trend 24 work with my bosch shx33a05uc/22 dishwasher? the dishwasher will not advance to next cycle. water is not hot enough
Answer: This water heater activates at 0.5 GPM and will heat to your set temperature at the correct flow rate for that set temperature. Please call our Technical Department at 1-800-582-8423 Ext 6 with more details so we can help you better. (for example, does the dishwasher have its own heating element, distance between the 2 units, etc...) Thank you.
Question: Electric panel is ~50 feet from where i want to install the tempra 29 trend. is this distance ok for #8 thhn wire
Answer: The recommended wire is 8/2 and there is not a limit to distance written in the install directions. You need to check with your electrician. Make sure he is state license and insured. We have installed a Tempra 29 and our electrician ran three 8/2's approx. 30' with no question. But check with your electrician and local codes. God bless you and happy New Year.
Question: Is there an installation kit available for this? i am installing in a remote location & plumbing parts are not available? water lines are pvc
Answer: There is no specific installation kit. However, we suggest using flexible braided hose connections that screw onto the hot and cold water for the first 18" or so. These connections are easy to remove to check a filter screen or if needed to work on the unit in general. The connections are 3/4" NPT. Please feel free to call our Technical Support Department at 1-800-582-8423 ext 6 with any questions. Thank You.
Question: Where is it made
Answer: We asked the Manufacturer and they replied: "These are made in Holzminden, Germany"

Product features

1 Find your approximate ground water temperature on the map.

2 Check the column on the table to see how many fixtures can be supplied at the same time for each model.

Bosch Electric Mini-Tank Water Heater Tronic 3000 T 7-Gallon (ES8) - Eliminate Time for Hot Water - Shelf, Wall or Floor Mounted

Bosch Thermotechnology

Based on 733 reviews Check latest price

Product description

120V - requires hard wiring. 1440W element. Magnesium anode rod. Rectangular shape with 2" of foam insulation. Glass lined tank for longer life. 6 year on heater and 1 year on parts for both commercial and residential use. Temperature/pressure relief valve included. Can be mounted both horizontally or vertically. Mounts on floor or wall. Meets ASHRAE 90. 1. See Info Page for technical and installation specifications.

Manufacturer Contact Information

800-283-3787

  • CONVENIENT HOT WATER HEATER: 7 gallon point-of-use mini-tank fits under your sink to provide hot water right where you need it. Thermal efficiency is 98%. Dimensions : 17.5 W x 17.5 H x 14.5 D Inches
  • INSTALLED VERTICALLY OR HORIZONTALLY: This larger model can be mounted vertically (7 gal. of water supply) or horizontally (5.1 gal. of water supply)- vertical orientation is installed with the cold and hot lines on top of the unit
  • RELIABLE WATER SOURCE: Easily hard-wire the 7-gallon model to provide the on-demand reliable water source your home or office needs
  • IMPORTANT INFORMATION: Heating capacity of 1440 watts and a temperature range of 65-145°F max. Operating pressure-150 psi. Water fittings-3/4 inch Male NPT. Electrical requirements (Amp 12A/Volts 120)
  • EASILY MOUNTED: Can be shelf, wall or floor mounted (bracket included for vertical orientation only); simply tap into the cold water line and install the water heater directly at the sink to provide hot water

User questions & answers

Question: What is the recovery time if the 7 gallons of hot water is used
Answer: I have the 4 gallon tank and it is not too bad for the reheat
Question: Can I reduce the pipe's size from 3/4 in to 1/2 in without any negative effect on the unit
Answer: No harm to unit.....Max water flow will be reduced a little.
Question: Can i use this to replace a small rv hot water heater
Answer: Yes, but realize that it's electric and draws quite a few amps, most rv water heaters are propane.
Question: The Manual request for the ES8 a 20 Amp breaker and 12GA wire. The wattage however is 1440 with 12 Amps. Why then 20 Amp breaker and not
Answer: I would use a 20 amp circuit with 12 ga wire but there are no inrush concerns with a resistive load. A heating element does not have a higher initial current draw like a motor. It draws 1440 watts or 12 amps at 120v. Since 14 ga wire must be fused for 15 amps, this device by itself is already at 80% of the circuit’s capacity.

Product features

Bosch ThermoTechnology

The Bosch Tronic 3000 T point-of-use electric mini-tanks are available in three compact sizes, which can be wall-hung (bracket included) or floor-mounted. They fit easily under a sink, even in a cabinet space, and because they have a sleek and attractive design, they blend in seamlessly with existing decor when installed in a visible location. Simply tap into the cold water line and install the water heater directly at the sink to provide hot water. Great for a wide range of locations!

Water Where You Need It

Provides hot water quickly at point of use and comes with temperature /pressure relief valve installed - 2.5 and 4 gallon tanks feature a simple 120 VAc plug-in connection (1440 watts).

Quality for Long-Life

Thick CFC-free foam insulation for maximum energy efficiency, glass-lined tank for durability.

Great for Small Spaces

Water heaters are compact and lightweight and can be floor, shelf, or wall mounted (except 7 Gallon) - features a sleek and attractive design to blend seamlessly with decor.

Minimize Wait Time for Hot Water

Waiting for hot water at a sink located far from a primary heating source can be frustrating. Only having access to cold water from a sink is just not useful, and plumbing a hot water line to every sink in a home or business requires time and money. To get hot water where it’s needed, when it’s needed, a better solution is to use the Tronic 3000 T from Bosch: a point-of-use electric mini-tank heater. This heater can supplement a primary water heating source, or be used under a single sink. In fact, the Bosch Tronic 3000 T can be used for three different applications: as a sole water heating source for a single sink, as a supplement to an existing heater located far from the sink, and as a buffer installed in-line with tankless water heaters that experience intermittent cold water, also known as 'cold water sandwiching'. No matter the configuration, there’s minimal stand-by loss from this premium mini-tank water heater.

Eemax EX190TC 3-Gallon Series Two Whole House Electric Tankless Water Heater

Eemax

Based on 22 reviews Check latest price

Product description

Cut energy costs - flow switch activates heater only on demand. Perfectly suited for single shower homes and condos.

From the Manufacturer

Cut energy costs - flow switch activates heater only on demand. Perfectly suited for single shower homes and condos.

  • 3/4 inch NPT water connections on bottom of the unit for easy installation
  • Saves space with a compact design
  • Thermostatic control for precise outlet temperature
  • Saves energy! this unit is 99% energy efficient
  • Bottom water connections
  • 99% Energy Efficient
  • Ease of installation - No T&P valve needed; 3/4" Male NPT connections on bottom

User questions & answers

Question: What size of electrial panel do I need? I have a 100AMP panel for everything
Answer: Yes, it is included
Question: Does this water heater draw 80 amps? What is the amperage of the circuit to supply it with electrical power
Answer: The power cord is firmly connected to the unit
Question: Does this work on 2 - 40 amp circuits
Answer: 6 11/16" in PDF owner's manual.
Question: Will this heater handle a one bedroom apartment with a kitchen sink, lav and shower. They are all within 30' of each other. Only one will run at tim
Answer: Yes, just push the stopper down and it seals

Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY

Rheem

Based on 456 reviews Check latest price

Product description

Professional classic® tankless electric water heaters offer continuous hot water quick and on demand for single point-of-use or multiple applications

  • External adjustable digital thermostatic control with LED display (+/1 degree accuracy
  • Durable Copper immersion two heating elements, field Serviceable.Self-modulating power control
  • Simple installation – 1/2 NPT adapters included; side 1/2 inch Compression water connections
  • 99.8% energy efficient. External controls to adjust temperature in increments of 1°f. Water-Saver Shower Head – 1.5 GPM
  • Threaded for easy replacement, simple installation, digital temperature display 54 A. 13kW Model Flow Rate: up to 3.17 GPM
  • 54 A

User questions & answers

Question: We have a 500sq' apt. 1 kitchen sink, 1 lav sink and tub/shower. This tankless heats water to both sinks but nothing to the tub/sh. Help
Answer: Sinks have aerators to slow down the water where a tub doesn't. It sounds like one possibility is that your exceeding the GPM for this heater. Next possibility, double check an measure your actually getting at least 240v at the heater, I had an issue where my unit was only getting 235v an it was causing a similar issue where only one of the two heating elements was activating. I had it set to 125F but it was coming out 100F. It was warm and without a meter I would of thought it was working correctly until I tried filling a tub. It couldn't even get the water warm. I pulled my wires out an restripped an cut an screwed them in an it fixed my problem, now its measuring around 245v. Make sure there is no copper showing after screwing down your input wires. Now filling the tub I noticed after about 10-15 seconds the water gets too hot to touch. I set it to 135F.
Question: Do these tankless water heaters require an overflow line to the outside of the home or a pan like is required on normal water heaters
Answer: No tank, so, no overflow line required. It mounts on the wall. A pan is needed if required by building code in your city.
Question: what are the wiring and power requirements
Answer: good morning,60 amp breaker and , number 6 cable !thank you have a great day!
Question: How many amps are needed for rheem rtex - 13 240v heating tankless electric water heater
Answer: Hello-The RTEX-13 requires 1x 60A@240V breaker / 6 AWG recommended wire size.Specs - http://cdn.globalimageserver.com/fetchdocument-rh.aspx?name=Specification-Sheet&id=fc3235b7-7cd0-42cd-93bc-7169ea92be31 Rheem 800-432-8373I hope this helped :)Ben

Product features

About Us

Brothers Richard and Donald Rheem founded Rheem Manufacturing Company in Emeryville, CA, in 1925. While the company has produced a number of products in its nearly 100 years of operation, Rheem is currently the manufacturer that produces heating, cooling, water heating, pool & spa heating and commercial refrigeration products, and it is one of the largest manufacturer of water heating products in North America.

Titan SCR2 N-120 Electric Tankless Water Heater 220 Volts

Based on 246 reviews Check latest price

Product description

Titan Original Product N-120 11.8 KW 220V 54A Tankless water heater SCR-2

  • Tankless Water Heater

User questions & answers

Question: why can't I get any water pressure or hot water in my tub? I works great in the kitchen and bathroom sink. this makes no sense to me
Answer: Most likely the lines running to your kitchen and bath sink are partially clogged with build up. That causes a water flow rate too low to trip the Titan water heater on. Most likely new water lines need to be run there. Good luck
Question: How can we purchase the Titan N120 Tankless water heater
Answer: Cash usually works well. You can buy direct from Tital, or a number of plumbing outlets, we have a few in Florida. I have also seen them on ebay & Amazon, about $200-$250.00 new
Question: we have a 1600 sf home want to know how big is the tankless water heather i need to buy
Answer: More important than how big your home is would be how close is the tankless heater to your point of use and how cold is the incoming water? I live in Florida, so the water is never very cold which helps the heater to work very well for me. If your incoming water is colder than 55*F, I would recommend a bigger unit than the N120.
Question: Is it Digtal
Answer: The unit has 2 (Only) buttons that are in fact digital, those 2 buttons are the only controls you have to turn up or down the temperature, needless to say, the buttons are right on the control panel of the unit and the control panel of the unit, is what fails and makes this unit a very poor choice, since the "10 years guarantee" only covers leaks, and nothing else on this unit.

Marey Power Pak Plus Tankless Electric Water Heater, 220 VOLT

MAREY

Based on 97 reviews Check latest price

Product description

The MAREY Power Pak 220-Volt tankless electric water heater combines the compact size to be installed almost anywhere with the power to provide endless hot water to a whole house. Its build at high quality standards to lasts many years. It is the only water heater in the market that has the ability to be wired to a 10 Amp, 20 Amp, 30 Amp or 40 Amp breaker. (By wiring the unit to a smaller breaker you are limited to the power setting you can use). The Power pack is a versatile and reliable tankless water heater that can be used either as a point of use or to supply unlimited hot water to a whole apartment or small house. It is also called water heater on demand, because it heats water only when needed, saving energy. It is designed in the USA and it's perfect to supply endless hot water for up to 1-2 points of use simultaneously, this greatly depends on your incoming water temperature and flow rate. (for a variety of residential hot-water applications). Its compact design saves space and is easy to install. It is ideal for a 1-2 bathroom house in a tropical climate. For regions with a cooler incoming temperature as found in most of the continental U. S. this would be more suited for a single point of use to achieve optimal performance. The amount of temperature increase will vary on the power setting and the flow rate of water going through the unit. MAREY has been in the water heating business since 1955, bringing tradition and innovation together.

  • Allows customer to regulate energy consumption, adapting the product to the home’s electric capacity
  • Easy management and simple adjustments
  • Filter on the water inlet that avoids sediments to damage the unit
  • Perfect for under the sink (one point of use) installation; requires very low water pressure to activate
  • Save up to 60% on electricity bills for water heating
  • Only uses electricity when you use it, so you save money

User questions & answers

Question: Can I use this for an outdoor shower
Answer: a little over 3 feet.
Question: I want to use it for 2 shower heads if not just one, would this work
Answer: Yes
Question: The specs say 220 volt so if we hardwire a 240 volt line into this marey power pack plus hot water heater, will it harm the unit
Answer: Yes
Question: My wh is not workig. does the wh has a reset bottom
Answer: 120V.

Product features

Power Pak Plus 220V

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