Best Tankless Water Heater For Whole House

Category: tankless water heater 👁 160 👍 3 ★★★★☆4.9

Our Top Picks

  • BEST OVERALL: Rinnai RU199iN Tankless Water Heater. ...
  • BEST BANG FOR THE BUCK: Rheem 240V Tankless Water Heater. ...
  • UPGRADE PICK: Rinnai RU180iN Sensei Tankless Water Heater. ...
  • BEST ELECTRIC: Stiebel Eltron Tempra 36 Plus Tankless Water Heater. ...
  • BEST PORTABLE: Hike Crew Portable Propane Water Heater.

One way or another, can a tankless water heater work for the whole house?

Whole-House Tankless Water Heater Whole-house units have higher GPM flow rate capacity and can handle the demand for more than one fixture at a time. For example, a unit may sufficient capacity to handle two shower fixtures at one time, or a dishwasher, kitchen sink, and lavatory hot water faucet at one time.

Without doubt, how much does a whole house tankless water heater cost? Tankless water heaters cost up to three times more than storage heaters — from less than $1,000 for an electric, whole-house model to $3,000 for a gas-powered one, including installation by a qualified plumber. Rewiring your house can easily add as much as $5,000 to the cost of installing a tankless water heater.

Nonetheless, can you run out of hot water with a tankless water heater?

Although a tankless system can't run out of hot water, it can be overwhelmed with demand. ... If more than one tap is on-demand hot water at the same time, however, such as other showers or a running washing machine, the water heater will struggle to keep up and drain extra power.

Can a tankless water heater fill a tub?

Please remember that tankless water heaters also come in different sizes, and you need to get a unit that will deliver a strong flow to the tub. A small tankless water heater can take a long time to fill a large tub. Second, bite the bullet and just install a larger water heater in place of your present water heater.

BESTSELLER NO. 1 in 2021

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

Rheem RTEX-24 24kW 240V Electric Tankless Water Heater, Gray
  • 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
BESTSELLER NO. 2 in 2021

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

EcoSmart ECO 11 Electric Tankless Water Heater, 13KW at 240 Volts with Patented Self Modulating Technology
  • 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
BESTSELLER NO. 3 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. 4 in 2021

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

Stiebel Eltron Tankless Water Heater – Tempra 24 Plus – Electric, On Demand Hot Water, Eco, White, 20.2
  • TEMPRA 24 PLUS – This specific model is 24kW, 240V/208V, requires a min. recommended household 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
BESTSELLER NO. 5 in 2021

Ecosmart POU 3.5 Point of Use Electric Tankless Water Heater, [email protected]

Ecosmart POU 3.5 Point of Use Electric Tankless Water Heater, 3.5KW@120-Volt
  • Can provide hot water for one sink at 0.5 GPM in warmer climates
  • Requires 1 x 30 amp breaker and 10 AWG wire
  • For one sink at 0.5 GPM in colder climates the POU 6 is recommended
  • Amperage Draw 29 amp. kW - 3.5 kW
  • Connection Fittings 1/2" NPT
BESTSELLER NO. 6 in 2021

EcoSmart 8 KW Electric Tankless Water Heater, 8 KW at 240 Volts with Patented Self Modulating Technology

EcoSmart 8 KW Electric Tankless Water Heater, 8 KW at 240 Volts with Patented Self Modulating Technology
  • The product is highly durable
  • The product is easy to use
  • Manufactured in China
  • Heating elements are durable and are threaded for easy replacement
  • Activation Flow - 0.3 GPM
BESTSELLER NO. 7 in 2021

Ecosmart ECO 36 36kw 240V Electric Tankless Water Heater

Ecosmart ECO 36 36kw 240V Electric Tankless Water Heater
  • 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
BESTSELLER NO. 8 in 2021

Rinnai Hot Water Heater / RL94IN /Natural Gas9.4 GPM Indoor Tankless, 9.4 GPM, RL94iN-Natural Gas/ 9.4 GPM

Rinnai Hot Water Heater / RL94IN /Natural Gas9.4 GPM Indoor Tankless, 9.4 GPM, RL94iN-Natural Gas/ 9.4 GPM
  • Professional Installation Recommended, call 833-746-6212 for assistance. Endless hot water for your entire home
BESTSELLER NO. 9 in 2021

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

Rheem RTEX-18 18kW 240V Electric Tankless Water Heater, small, 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 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
BESTSELLER NO. 10 in 2021

Eccotemp i12-LP water heater, 4 GPM, Black

Eccotemp i12-LP water heater, 4 GPM, Black
  • Whole home indoor, gas powered tankless water heater, rated at 4 GPM that activates only on demand and no pilot light needed, reducing energy consumption
  • Sleek, modern design with black tempered glass front panel featuring an easy to use LED display controls
  • Features fully automatic temperature controls with an energy saving mode and child lock technology
  • Safe electronic ignition system; Plugs into standard 110v electrical outlet with UL-listed cord
  • Uses standard 1/2" NPT water fittings and comes with horizontal venting allowing for a convenient and quick installation

3 More Questions Answered

Why is tankless water heater installation so expensive?

Installation is expensive because the unit needs a bigger gas supply than a conventional water heater does, and it needs to run its own exhaust flue to the exterior. Installation costs can vary widely, depending on the location of the flue and the gas supply. The unit itself costs between $800 and $1,000.

How do I size a tankless water heater for my house?

How to Select the Right Size Tankless Water Heater
  • Determine the maximum number of devices you want to run and their total flow rate. Then, add up their flow rates (gallons per minute). ...
  • Determine required temperature rise. ...
  • Sizing Example: An average shower will be between 104–106° and uses 2.6 gallons of water.
  • Which is better tankless or 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.