Calculator Instructions
Return to Calculator Tab
Masonry Heater Performance Calculator - Borst Engineering & Construction LLC
Amount of Wood Burned per Day (Lbs)
BTU Value of Wood (BTU/Lb, 6880 for Douglas Fir with 20% moisture content)
Heater Overall Efficiency (%, 55-79 typical)
Indoor Temp (Degrees F, 68 typical)
Initial Facing Temp (Degrees F, 68 typical)
Firebox Door Area (SF, 3.5 typical)
Facing Area (SF, 100 typical)
Facing Thickness (Inches, 5 typical)
Facing Density (Lbs/CF, 150 typical)
Facing Thermal Conductivity (BTU-Inch/H-SF-Deg F, 14 typical)
Facing Specific Heat Capacity (BTU/LB-Deg F, 0.2 is typical)
Facing Emissivity (%, 85-95 typical)
Facing Convection Heat Transfer Coefficient (BTU/H-SF-Deg F, Still Air is 1.56)
Total Heat Gain (BTU/Day)
Average Heat Gain (BTU/Hour)
Facing Volumetric Heat Capacity (BTU/CF-Deg F)
Facing Thermal Diffusivity (SF/Hour)
Facing Maximum Surface Temp (Degrees F)
Facing Maximum Surface Temp Time (Hours after Firing)
Heat Gain at 30 Minutes (BTU/Hour)
Heat Gain at 1 Hour (BTU/Hour)
Heat Gain at 2 Hours (BTU/Hour)
Heat Gain at 4 Hours (BTU/Hour)
Heat Gain at 6 Hours (BTU/Hour)
Heat Gain at 8 Hours (BTU/Hour)
Heat Gain at 10 Hours (BTU/Hour)
Heat Gain at 12 Hours (BTU/Hour)
Heat Gain at 14 Hours (BTU/Hour)
Heat Gain at 16 Hours (BTU/Hour)
Heat Gain at 18 Hours (BTU/Hour)
Heat Gain at 20 Hours (BTU/Hour)
Heat Gain at 22 Hours (BTU/Hour)
Heat Gain at 24 Hours (BTU/Hour)
Borst Engineering & Construction LLC
Terms of Use
