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Natural Gas Whole-House Tankless Water Heaters

BTU CALCULATOR
BTU CALCULATOR

BTU stands for "British Thermal Unit" and measures the heating or cooling capacity of a furnace or air conditioning unit. Enter your homes square footage to see how many BTU's are required to adequately heat or cool it.

Enter the square footage of your home (or room) and press Go.

Square Footage

GO
This calculator is for estimating capacity only, and does not give exact equipment capacities for your home.
Displaying 1-15 of 15 results
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  • Rinnai R53e-NG

    Exterior, 5.3 GPM, Natural Gas, 80% Efficiency Tankless Water Heater

    $ 677.99
    (0 Reviews)
  • Rinnai R75LSe-NG

    Exterior, 7.5 GPM, Natural Gas, 83% Efficiency Tankless Water Heater

    $ 981.99
    (0 Reviews)
  • Rinnai R98LSeN

    Exterior, 9.8 GPM, Natural Gas, 83% Efficiency Tankless Water Heater

    $1,129.99 Free Shipping
    (0 Reviews)
  • Rinnai RL75eN

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

    $ 951.99
    (0 Reviews)
  • Rinnai RL75iN

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

    popular
    $ 952.99
    (0 Reviews)
  • Rinnai RL94eN

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

    $1,143.99
    (0 Reviews)
  • Rinnai RL94iN

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

    $1,143.99
    (0 Reviews)
  • Rinnai RU80eN

    Exterior, 8.0 GPM, Natural Gas, Tankless Water Heater

    $1,150.99 Free Shipping
    (0 Reviews)
  • Rinnai RU80iN

    Interior, 8.0 GPM, Natural Gas, Tankless Water Heater

    $1,154.99 Free Shipping
    (0 Reviews)
  • Rinnai RU98eN

    Exterior, 9.8 GPM, Natural Gas, Tankless Water Heater

    popular
    $1,293.99 Free Shipping
    (0 Reviews)
  • Rinnai RU98iN

    Interior, 9.8 GPM, Natural Gas, Condensing, Tankless Water Heater

    popular
    $1,293.99 Free Shipping
    (0 Reviews)
  • Rinnai V65eN

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

    $ 636.99
    (0 Reviews)
  • Rinnai V65iN

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

    $ 682.99
    (0 Reviews)
  • Rinnai V75eN

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

    $ 869.99
    (0 Reviews)
  • Rinnai V75iN

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

    $ 869.99
    (0 Reviews)

In 2002 Alpine Home Air Products became the first company to sell heating, air conditioning and indoor air-quality products online. We have proudly served hundreds of thousands of customers, helping them save time and money by buying their products direct.