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Natural Gas Whole-House Tankless Water Heaters

These are water heaters for domestic water, meaning for heating your home's drinking, washing and bathing water. Tankless water heaters, also known as on-demand or continuous flow water heaters, only heat the water when needed, which is beneficial. When water flow is detected the water heater turns on, and when the demand for hot water ceases the unit shuts down to conserve energy. This is much more energy efficient than the traditional tank-style water heater which keeps all of the water in the tank hot at all times. Other benefits of tankless water heaters are that the hot water supply is endless so you'll never run out of hot water, and they take up much less space than a tank-style water heater. There is an alternative use for these tankless heaters as well, which is to heat your home when combined with a hydronic air handler. Click here to select the correct size tankless water heater for your home.
Displaying 1-18 of 18 results
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  • Rinnai RH180N

    91,300 BTU Hybrid Tank-Tankless Water Heater, Natural Gas

    $1,584.99 Free Shipping

    Or as low as /mo

    (0 Reviews)
  • Rinnai RL75eN

    Exterior, 7.5 GPM, Natural Gas, 82% Efficiency Tankless Water Heater

    $ 969.99

    Or as low as /mo

    (2 Reviews)
  • Rinnai RL75iN

    Interior, 7.5 GPM, Natural Gas, 82% Efficiency Tankless Water Heater

    popular
    $ 939.99

    Or as low as /mo

    (2 Reviews)
  • Rinnai RL94eN

    Exterior, 9.4 GPM, Natural Gas, 83% Efficiency Tankless Water Heater

    popular
    $1,142.99

    Or as low as /mo

    (2 Reviews)
  • Rinnai RL94iN

    Interior, 9.4 GPM, Natural Gas, 83% Efficiency Tankless Water Heater

    popular
    $1,142.99

    Or as low as /mo

    (2 Reviews)
  • Rinnai RLX94iN

    Interior, 9.8 GPM, Natural Gas, 0.82 Energy Factor Tankless Water Heater

    $1,161.99

    Or as low as /mo

    (2 Reviews)
  • Rinnai RU80eN

    Exterior, 8.0 GPM, Natural Gas, Tankless Water Heater

    $1,190.99 Free Shipping

    Or as low as /mo

    (5 Reviews)
  • Rinnai RU98eN

    Exterior, 9.8 GPM, Natural Gas, Tankless Water Heater

    $1,418.99 Free Shipping

    Or as low as /mo

    (5 Reviews)
  • Rinnai RUC80iN

    Interior, 8.0 GPM, Natural Gas, 0.96 Energy Factor Tankless Water Heater

    $1,037.99

    Or as low as /mo

    (5 Reviews)
  • Rinnai RUC98iN

    Interior, 9.8 GPM, Natural Gas, 0.95 Energy Factor Tankless Water Heater

    $1,233.99

    Or as low as /mo

    (5 Reviews)
  • Rinnai RUCS65iN

    Interior, 6.5 GPM, Natural Gas, 0.93 Energy Factor Tankless Water Heater

    $ 812.99

    Or as low as /mo

    (5 Reviews)
  • Rinnai RUCS75iN

    Interior, 7.5 GPM, Natural Gas, 0.93 Energy Factor Tankless Water Heater

    $ 951.99

    Or as low as /mo

    (5 Reviews)
  • Rinnai RUR98eN

    Exterior, 9.8 GPM, Natural Gas, 0.95 Energy Factor Tankless Water Heater

    $1,668.99

    Or as low as /mo

    (5 Reviews)
  • Rinnai RUR98iN

    Interior, 9.8 GPM, Natural Gas, 0.95 Energy Factor Tankless Water Heater

    $1,668.99

    Or as low as /mo

    (5 Reviews)
  • Rinnai V65eN

    Exterior, 6.6 GPM, Natural Gas, 82% Efficiency Tankless Water Heater

    $ 649.99

    Or as low as /mo

    (0 Reviews)
  • Rinnai V65iN

    Interior, 6.6 GPM, Natural Gas, 82% AFUE Tankless Water Heater

    $ 710.99

    Or as low as /mo

    (0 Reviews)
  • Rinnai V75eN

    Exterior, 7.5 GPM, Natural Gas, 82% Efficiency Tankless Water Heater

    $ 843.99

    Or as low as /mo

    (0 Reviews)
  • Rinnai V75iN

    Interior, 7.5 GPM, Natural Gas, 82% Efficiency Tankless Water Heater

    $ 809.99

    Or as low as /mo

    (0 Reviews)