Best Electric Tankless Water Heater For Radiant Heat

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Sizing Guide For Tankless Water Heaters: Equivalents Table

How big is your familyHow big was your old water heaterCapacity required (in gallons per minute – GPM)
1-2 people30, 40, 50 gallons3, 4, 5 GPM
2-3 people40, 50+ gallons4, 5, 6 GPM
3-4 people50, 75, 80 gallons6, 7, 8 GPM
5+ people75, 80+ gallons8, 9, 10, 11 GPM

Even in the case, what is a good electric tankless water heater?

The Best Electric Tankless Water Heater Reviews

  • Ecosmart ECO36. See More Photos at Amazon >>> ...
  • Stiebel Eltron Tempra Plus. See More Photos at Amazon >>> ...
  • Rheem RTEX-13. See more photos at Amazon >>> ...
  • Bosch WH27. See More Photos at Amazon >>> ...
  • Titan SCR2 N-120. See More Photos at Amazon >>> ...
  • Sio Green IR260 POU. ...
  • Sio Green SIO18.
  • Finally, can you use a tankless water heater for radiant heat? Though they are sold primarily for domestic hot water, tankless heaters are actually well-suited for radiant heating, which operates at low temperatures compared with, for example, hot-water baseboard. So using the unit for radiant heating generally has little or no effect on the sizing calculation.

    Somehow, what is the best water heater for radiant floor heat?

    Water Heater for Radiant Floor Heat Comparison Chart

    NameMax Flow
    Takagi T-KJr2-IN-NG Indoor Tankless Water Heater Top Pick (Smaller Spaces)6.6 GPMCHECK PRICE
    Takagi T-H3-DV-N Condensing Indoor Tankless Water Heater Top Pick (Larger Spaces)10 GPMCHECK PRICE

    What size tankless water heater do I need for radiant heat?

    You'll need to be able to heat at least 5.2 gallons of water. So you'll need a tankless water heater that can produce at least a 60 degree rise in temperature at 5.2 gallons per minute.

    BESTSELLER NO. 1 in 2021

    Ecosmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology,White

    Ecosmart ECO 18 Electric Tankless Water Heater, 18 KW at 240 Volts with Patented Self Modulating Technology,White
    • The product is highly durable
    • The product is easy to use
    • Manufactured in China
    • Copper and stainless components
    • Lifetime warranty for residential use
    • Save up to 60% on your water heating costs with the most advanced, self modulating technology available
    • Never run out of hot water with an ECOSMART tankless water heater.
    • Save up to 12 cubic feet of storage space.
    • Digital temperature control in 1-degree increments gives users complete control of hot water
    • 75 A
    BESTSELLER NO. 2 in 2021

    Rheem 240V 4 Heating Chambers RTEX-36 Residential Tankless Water Heater, GRAY

    Rheem 240V 4 Heating Chambers RTEX-36 Residential Tankless Water Heater, GRAY
    • External digital thermostatic control with LED display (+/1 degree accuracy)
    • Most advanced self-modulation, adjust power to meet hot water demand
    • Durable Copper immersion four heating elements, field Serviceable
    • Simple installation – bottom 3/4 inch NPT water connections
    • Threaded for easy replacement, simple installation, digital temperature display.Amperage:150 amps.A max flow of 8.0 GPM
    BESTSELLER NO. 3 in 2021

    Stiebel Eltron Tankless Water Heater - Tempra 15 Trend – Electric, On Demand Hot Water, Eco, White

    Stiebel Eltron Tankless Water Heater - Tempra 15 Trend – Electric, On Demand Hot Water, Eco, White
    • TEMPRA 15 TREND – This specific model is 14.4kW, 240V/208V, requires a min. recommended household electric service of 100 A, and offers an output water temperature of 86˚ to 140˚F. Check our guides below to compare features of our various Trend and Plus models, each available in different kW levels
    BESTSELLER NO. 4 in 2021

    Tankless Water Heater Electric,ECOTOUCH 9KW 240V On Demand Water Heater Self-Modulating Instant Hot Water Heater ECO90 Black

    Tankless Water Heater Electric,ECOTOUCH 9KW 240V On Demand Water Heater Self-Modulating Instant Hot Water Heater ECO90 Black
    • 【INSTANT & SUFFICIENT HOT WATER】 Applied with 9kW heating system, the electric water heater ECO90 supplies instant, consistent and endless hot water of 116℉or higher temp shortly, no waiting for preheating nor temp fluctuations in use, perfect companion for sink and faucet.
    • 【SMART SELF Modulation】The hot water heater ECO90 adjusts power input according to flow rate and temp setting in real time, less power will be applied by the system when waterflow reduced, thus you still get ideal temperature instead of scalding hot water, which means comfortable experience. Optimal energy efficiency of 99.8% saves considerable electric charge.
    • 【UPGRADED HEATING ELEMENT】The ECO90 hot water heater is applied with micro-computer control and patent heating technology. Water pipe is completely separated from electricity by cast aluminum module, which also guaranttes no"cold water sandwich" and avoids any corrosion inside pipes so as to extend service life.
    • 【SAFE AND DURABLE】Applied with multiple protection devices, every unit goes through strict tests to ensure 100% safety. Inner water and electricity lines are designed to run separately so as to avoid leakage or harm of scale build up. Approval by ETL and qualifies for UL, you can expect outstanding performance for years to come.
    • 【CONVENIENT USE】The ECO90 tankless water heater comes with digital display & touch control panel so temp setting is easy job. It's space saving, measuring: 15.8″ H x 11.1″ W x 3.1″ D. Plus it has a stylish, modern design that blends in any location. Please verify it is the right size for you: 9kW@240V (not 110V); pipes fittings : 1/2" NPT.
    BESTSELLER NO. 5 in 2021

    Rheem RTEX-08 8kW 240V Tankless Electric Water Heater, Gray

    Rheem RTEX-08 8kW 240V Tankless Electric Water Heater, Gray
    • ON/OFF Dial Control with adjustable digital temperature display
    • Self-modulating power control
    • 8kW Model Flow Rate: up to 1.95 GPM
    • Side 1/2" NPT water connections
    • On demand; continous hot water
    BESTSELLER NO. 6 in 2021

    iHeat Tankless AHS18-D 240V 75A 18KW Stainless Steel Enclosure 3/4" MIP 16" by 13.5" by 3.5" Electric Water Heater, 13.7 lb

    iHeat Tankless AHS18-D 240V 75A 18KW Stainless Steel Enclosure 3/4
    • The heat pro-performer AHS18-D is built for applications with more than 1 bathroom in the southern states where the incoming water temperatures no lower than 65 degrees F
    • Because the heat pro-performer continuously monitors all real time data collected 60 times a second through a range of sensors
    • It automatically adjusts to any application you may have, for example floor heating, multiple units in series and recirculation configurations
    • The heat pro-performer boasts a 3/4 in. Inlet and outlet which makes it a breeze for high flow applications
    • Heat electric tank less water heaters are 99% energy efficient which can translate to saving 10-25% on your water heating bills
    BESTSELLER NO. 7 in 2021

    Camplux Tankless Water Heater Electric, TE27 27kW Whole House Instant Water Heater, On Demand Electric Water Heater Digital Display and Remote Control, 240V, Black

    Camplux Tankless Water Heater Electric, TE27 27kW Whole House Instant Water Heater, On Demand Electric Water Heater Digital Display and Remote Control, 240V, Black
    • SMART & CONSIDERED DESIGN - The point of use tankless water heater design with touch control & digital display, save space, smart and easy to set temperature. Comes with remote smart controller, very convenient even install under sink.
    • RELIABLE AND DURABLE- The 27kW tankless water heater comes with multiple protection. NFS approved, offer lead-free water. ETL safety certified, leakage and overheat protection device to ensure your safety. Stainless steel component for high efficiency and durability.
    • INSTANT ENDLESS HOT WATER - Enjoy instant and endless hot water! The on demand tankless water heater rated power up to 87,500 BTU. Easy to get water between 86°F - 125°F.
    • MINIMUM ACTIVATION WATER FLOW - Camplux electric tankless water heaters just need 0.85 GPM water flow for activation. No need to waiting and pre-heating. Get hot water in seconds.
    • COMPACT DESIGN & MULTI-ANGLED MOUNTING - The compact size electric water heater requires a connection of 3* 50A 2 poles circuit breaker. Install close to outlet for energy saving. Can be mounted Multi-angled, ideal for kitchen, school, hospital and hair salon. Please make sure it is the right size for you: 27kW at 240V, product dimensions 15.15" x 10.23" x 3.66", water pipes fitting: 3/4" NPT male.
    BESTSELLER NO. 8 in 2021

    iHeat Tankless S-16 240V 66A 16KW Stainless Steel Enclosure 7.2" by 11" by 3" 1/2"CPT 36' AWG#8 Electric Water Heater, 7.5 lb

    iHeat Tankless S-16 240V 66A 16KW Stainless Steel Enclosure 7.2
    • The heat tank less stainless Steel construction is a perfect fit for any applications near the ocean, like beach front properties, yachts, small boats, resorts and outdoor kitchens
    • Heat tank less s series can also be used in highly sterile applications like commercial kitchens, hospitals, clinics, and even schools where cleanliness is of the highest importance
    • Heat tank less s series saves valuable space with its compact size, the s series compared to tank Type water heaters, is small enough to fit any under counters installations, or even closets
    • Heat tank less water heater saves you up to 60% on your water heating costs.Water proof construction allows you to easily and safely control the temperature by using our water proof interactive touch pad
    • Dimensions: 11.5 x 9 x 4.5 inches
    BESTSELLER NO. 9 in 2021

    Thermoflow 18KW at 240V Tankless Water Heater Electric, On Demand Instant Hot Water Heater with Self-Modulating Temperature Technology, CSA Certified Wall Mounted

    Thermoflow 18KW at 240V Tankless Water Heater Electric, On Demand Instant Hot Water Heater with Self-Modulating Temperature Technology, CSA Certified Wall Mounted
    • On Demand Endless Hot Water - instant hot water tankless water heater, constant supply of hot water whenever and however long you need, elimiate waiting time and never run out of hot water; Flow rate 2.7GPM at 45°F temp.rise and 1.9GPM at 65°F temp.rise
    • Energy and Cost Saving - Heating water only when it's needed with heating efficiency up to 99%, savings of up to 50% on water heating costs; minimal activation flow rate 0.66GPM
    • Self-Modulating Temperature Technology of Germany - use only neccessary energy to heat water to temperature of your needs, also ensure steady output temperature despite of flow fluctuation. LCD digital display shows output temperature, which allow you to adjust temperature in 1-degree increments; temperature range 104-167°F
    • Easy Installation and Durable - Compact and wall-mounted design with Six stainless steel heating elements, CSA & UL certified, IPX24 protection, ensuring a long service life (online video installation guidance available)
    • NOTICE - Please verify that this model is the right size for your hot water needs and electrical requirements before purchase & installation. Dimensions: 18.6" x 10" x 4.5" ; Weight: 8.4 lbs; Pipes fittings :1/2 inch NPT, Nominal pressure: 115PSI. Electrical requirements: 18 kW at 240 volts. Nominal current: 2 x 38A . Required breakers: 2 x 2-POLE 50 AMP. Required wire: 2 x 10 AWG . ( Breakers and wire are NOT included ); 24months warranty and timely customer service support
    BESTSELLER NO. 10 in 2021

    BLACK+DECKER Black+Decker 24 kW Self-Modulating 4.68 GPM Electric Tankless Water Heater, Multi-Application hot water heater electric

    BLACK+DECKER Black+Decker 24 kW Self-Modulating 4.68 GPM Electric Tankless Water Heater, Multi-Application hot water heater electric
    • On demand hotwater heater for ideal for whole house
    • Electric Water Heater with no hot water tank
    • WARRANTY: 7-yr leakage free, 5-yr heat exchanger, 2-yr parts
    • Save up to 50% on your water heating costs

    8 More Questions Answered

    Can you heat a whole house with radiant floor heating?

    Yes! The short answer to “Can you heat your entire home with radiant floor heating”? is yes. In theory, as long as you have a floor, you can utilize radiant floor heating. The heating system goes right into the floor, heating water or using electricity in an infrastructure of pipes.

    Can I replace my boiler with a tankless water heater?

    Now onwards – As mentioned each home is different and a tankless definitely can't be installed as a boiler replacement in all situations. But they can in quite a few. A tankless is upwards of 98% efficient and can bring you quite a bit of money and energy savings.

    Is electric tankless water heater better than tank?

    For homes that use 41 gallons or less of hot water daily, demand water heaters can be 24%–34% more energy efficient than conventional storage tank water heaters. ... In contrast, storage water heaters last 10–15 years. Tankless water heaters can avoid the standby heat losses associated with storage water heaters.

    What is the water temperature for radiant heat?

    85 - 125 °F

    How much does hot water radiant cost?

    Installing a radiant heat boiler costs from $6,000 to $9,000 and an extra $6 to $20 per square foot for the hydronic heating system in the house. Hot water radiant heating costs less to operate than electric systems because water conducts and holds heat very well, meaning there is less actual operating time.

    How long does a radiant heat boiler last?

    20 years

    How many gpm do I need for a whole house tankless water heater?

    Most homes will only demand one major hot water use at a time, or a maximum of 2 flow-restricted showers, etc. Generally, a maximum flow rate of 3 GPM will be sufficient for such applications.

    How hard is it to install an electric tankless water heater?

    Electric tankless water heaters are cheaper than the gas versions. Installation is easier and less expensive, and they're generally not as difficult to maintain as gas models. ... Keep in mind, however, that most conventional gas tank water heaters were not installed with a tankless retrofit in mind.