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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 115 results
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  • Rinnai EX38CTN

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

    $1,959.00 Free Shipping
    Not In Stock

    Or as low as /mo

    (7 Reviews)
  • Rinnai EX38CTWN

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

    $1,959.00 Free Shipping
    Not In Stock

    Or as low as /mo

    (11 Reviews)
  • Rinnai EX38CTWP

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

    $1,959.00 Free Shipping
    Not In Stock

    Or as low as /mo

    (11 Reviews)
  • Williams 1403821

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

    $ 636.99 Free Shipping
    In Stock

    Or as low as /mo

    (1 Review)
  • Williams 1403822

    14,000 BTU, 65% AFUE, Direct-Vent Wall Furnace, Top Air Outlet, Natural Gas, No Electricity Required

    popular
    $ 630.99 Free Shipping
    Not In Stock

    Or as low as /mo

    (0 Reviews)
  • Williams 2509822

    25,000 BTU, 71% AFUE, Monterey Plus Top-Vent Wall Furnace, Top Air Outlet, Natural Gas, No Electricity Required

    $ 599.99 Free Shipping
    Not In Stock

    Or as low as /mo

    (2 Reviews)
  • Williams 2539821

    25,000 BTU,High Altitude (6,001 - 8,000'), 71% AFUE, Monterey Plus Top-Vent Wall Furnace, Top Air Outlet, LP, No Electricity Required

    $ 733.99 Free Shipping
    In Stock

    Or as low as /mo

    (2 Reviews)
  • Williams 2559622A

    25,000, BTU, 67% AFUE, High Altitude (6,001 - 8,000'), Monterey Top-Vent Wall Furnace, Top Air Outlet, Natural Gas, No Electricity Required

    $ 615.99 Free Shipping
    In Stock

    Or as low as /mo

    (7 Reviews)
  • Williams 2903511

    29,000 BTU, 82% AFUE, Direct-Vent Wall Furnace, Top Air Outlet, Liquid Propane, 120 VAC

    $1,488.99 Free Shipping
    Not In Stock

    Or as low as /mo

    (1 Review)
  • Williams 2903512

    29,000 BTU, 82% AFUE, Direct-Vent Wall Furnace, Top Air Outlet, Natural Gas, 120 VAC

    $1,488.99 Free Shipping
    Not In Stock

    Or as low as /mo

    (2 Reviews)
  • Williams 3509822

    35,000 BTU, 69% AFUE, Top-Vent Wall Furnace, Monterey Plus Top Air Outlet, Natural Gas, No Electricity Required

    $ 590.99 Free Shipping
    Not In Stock

    Or as low as /mo

    (2 Reviews)
  • Williams 4007332

    40,000 BTU, 80% AFUE, Direct-Vent Wall Furnace, Bottom Air Outlet, Natural Gas, 115 VAC

    $1,225.20 Free Shipping
    Not In Stock

    Or as low as /mo

    (8 Reviews)
  • Williams 4007731

    40,000 BTU, 75% AFUE, Direct-Vent Wall Furnace, Bottom Air Outlet, LP, 115 VAC

    $1,019.99 Free Shipping
    In Stock

    Or as low as /mo

    (7 Reviews)
  • Williams 5008632

    50,000 BTU, 74% AFUE, Top-Vent Wall Furnace, Bottom Air Outlet, Natural Gas, 115 VAC

    popular
    $ 969.60 Free Shipping
    In Stock

    Or as low as /mo

    (2 Reviews)
  • Williams 5009821

    50,000 BTU, 71% AFUE, Monterey Plus 2-Sided Top-Vent Wall Furnace, Top Air Outlet, LP, No Electricity Required

    $ 832.99 Free Shipping
    In Stock

    Or as low as /mo

    (2 Reviews)
  • Williams 5009822

    50,000 BTU, 71% AFUE, Monterey Plus 2-Sided Top-Vent Wall Furnace, Top Air Outlet, Natural Gas, No Electricity Required

    $ 770.99 Free Shipping
    In Stock

    Or as low as /mo

    (2 Reviews)
  • Williams 5039821

    50,000 BTU, 69% AFUE, High Altitude (4,001 - 6,000'), Monterey 2-Sided Top-Vent Wall Furnace, Top Air Outlet, LP, No Electricity Required

    $1,018.99 Free Shipping
    In Stock

    Or as low as /mo

    (7 Reviews)
  • Williams 5058632

    50,000 BTU, 74% AFUE, High Altitude (6,001 - 8000'), Top-Vent Wall Furnace, Bottom Air Outlet, NG, 115 VAC

    $1,040.40 Free Shipping
    In Stock

    Or as low as /mo

    (0 Reviews)
  • Williams 5507332

    55,000 BTU, 76% AFUE, Direct-Vent Wall Furnace, Bottom Air Outlet, Natural Gas, 115 VAC

    $1,350.60 Free Shipping
    Not In Stock

    Or as low as /mo

    (8 Reviews)
  • Williams 5508232

    55,000 BTU, 76% AFUE, Top-Vent Wall Furnace, Bottom Air Outlet, Natural Gas, 115 VAC

    $1,201.80 Free Shipping
    In Stock

    Or as low as /mo

    (2 Reviews)
  • Williams 6007732

    60,000 BTU, 76% AFUE, Direct-Vent Wall Furnace, Bottom Air Outlet, Natural Gas, 115 VAC with 9809 Vent Kit

    $1,169.99 Free Shipping
    Not In Stock

    Or as low as /mo

    (8 Reviews)
  • Rinnai EX08CN

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

    $1,038.75 Free Shipping
    Not In Stock

    Or as low as /mo

    (11 Reviews)
  • Rinnai EX08CP

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

    $1,038.75 Free Shipping
    Not In Stock

    Or as low as /mo

    (11 Reviews)
  • Rinnai EX11CN

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

    $1,242.75 Free Shipping
    Not In Stock

    Or as low as /mo

    (11 Reviews)