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Natural Gas / LP Wall Furnaces

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 1-24 of 114 results
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  • Rinnai EX08CN

    8,000 BTU Direct Vent, 82% Efficiency, Natural Gas Wall Furnace

    $ 952.99 Free Shipping

    Or as low as /mo

    (10 Reviews)
  • Rinnai EX08CP

    8,000 BTU Direct Vent, 83% Efficiency, Liquid Propane Wall Furnace

    $ 919.99 Free Shipping

    Or as low as /mo

    (10 Reviews)
  • Rinnai EX11CN

    11,000 BTU Direct Vent, 81% Efficiency, Natural Gas Wall Furnace

    $1,072.99 Free Shipping

    Or as low as /mo

    (10 Reviews)
  • Rinnai EX11CP

    11,000 BTU Direct Vent, 82% Efficiency, Liquid Propane Wall Furnace

    $1,072.99 Free Shipping

    Or as low as /mo

    (10 Reviews)
  • Rinnai EX17CN

    16,700 BTU Direct Vent, 81% Efficiency, Natural Gas Wall Furnace

    $1,308.99 Free Shipping

    Or as low as /mo

    (10 Reviews)
  • Rinnai EX17CP

    16,700 BTU Direct Vent, 82% Efficiency, Liquid Propane Wall Furnace

    $1,308.99 Free Shipping

    Or as low as /mo

    (10 Reviews)
  • Rinnai EX22CN

    21,500 BTU Direct Vent, 81% Efficiency, Natural Gas Wall Furnace

    $1,378.99 Free Shipping

    Or as low as /mo

    (10 Reviews)
  • Rinnai EX22CP

    20,700 BTU Direct Vent, 82% Efficiency, Liquid Propane Wall Furnace

    $1,378.99 Free Shipping

    Or as low as /mo

    (10 Reviews)
  • Rinnai EX22CWP

    20,700 BTU Direct Vent, 82% Efficiency, Liquid Propane Wall Furnace

    $1,380.99 Free Shipping

    Or as low as /mo

    (10 Reviews)
  • Rinnai EX38CN

    38,400 BTU Direct Vent, 80% Efficiency, Natural Gas Wall Furnace

    $1,704.99 Free Shipping

    Or as low as /mo

    (6 Reviews)
  • Rinnai EX38CP

    36,500 BTU Direct Vent, 82% Efficiency, Liquid Propane Wall Furnace

    popular
    $1,724.99 Free Shipping

    Or as low as /mo

    (6 Reviews)
  • Rinnai EX38CWN

    38,400 BTU Direct Vent, 80% Efficiency, Natural Gas, White Wall Furnace

    $1,713.99 Free Shipping

    Or as low as /mo

    (10 Reviews)
  • Rinnai EX38CWP

    36,500 BTU Direct Vent, 82% Efficiency, Liquid Propane, White Wall Furnace

    $1,704.99 Free Shipping

    Or as low as /mo

    (10 Reviews)
  • Williams 0743511

    7,400 BTU, 79% Efficiency, Direct-Vent Wall Furnace, Top Air Outlet, Liquid Propane, No Electricity Required

    $ 697.99 Free Shipping

    Or as low as /mo

    (1 Review)
  • Williams 0743512

    7,400 BTU, 79% Efficiency, Direct-Vent Wall Furnace, Top Air Outlet, Natural Gas, No Electricity Required ***Not in Stock, ETA 7/15/2016***

    $ 673.99

    Or as low as /mo

    (2 Reviews)
  • Williams 1403821

    14,000 BTU, 76% AFUE, Direct-Vent Wall Furnace, Top Air Outlet, LP, No Electricity Required

    $ 599.99 Free Shipping

    Or as low as /mo

    (0 Reviews)
  • Williams 1403822

    14,000 BTU, 76% AFUE, Direct-Vent Wall Furnace, Top Air Outlet, Natural Gas, No Electricity Required

    $ 630.99 Free Shipping

    Or as low as /mo

    (1 Review)
  • Williams 1413821

    14,000 BTU, 65% AFUE, High Altitude (2,001 - 4,000'), Direct-Vent Wall Furnace, Top Air Outlet, LP, No Electricity Required

    $ 669.99 Free Shipping

    Or as low as /mo

    (0 Reviews)
  • Williams 1413822

    14,000 BTU, 65% AFUE, High Altitude (2,001 - 4,000'), Direct-Vent Wall Furnace, Top Air Outlet, Natural Gas, No Electricity Required

    $ 655.99 Free Shipping

    Or as low as /mo

    (0 Reviews)
  • Williams 1433821

    14,000 BTU, 76% AFUE, High Altitude (4,001 - 6,000'), Direct-Vent Wall Furnace, Top Air Outlet, LP, No Electricity Required

    $ 656.99 Free Shipping

    Or as low as /mo

    (0 Reviews)
  • Williams 1433822

    14,000 BTU, 65% AFUE, High Altitude (4,001 - 6,000'), Direct-Vent Wall Furnace, Top Air Outlet, Natural Gas, No Electricity Required

    $ 688.99 Free Shipping

    Or as low as /mo

    (0 Reviews)
  • Williams 1453821

    14,000 BTU, 65% AFUE, High Altitude (6,001 - 8,000'), Direct-Vent Wall Furnace, Top Air Outlet, LP, No Electricity Required

    $ 669.99 Free Shipping

    Or as low as /mo

    (0 Reviews)
  • Williams 1453822

    14,000 BTU, 65% AFUE, High Altitude (6,001 - 8,000'), Direct-Vent Wall Furnace, Top Air Outlet, Natural Gas, No Electricity Required

    $ 655.99 Free Shipping

    Or as low as /mo

    (0 Reviews)
  • Williams 1773511

    17,700 BTU, 82% AFUE, Direct-Vent Wall Furnace, Top Air Outlet, Liquid Propane, 120 VAC

    $1,387.99 Free Shipping

    Or as low as /mo

    (1 Review)