Heat Loss Calculator | U.S. Boiler Company

Length Width Height

Total Area (ft²)

Total Room/Building:

Length

Width

Height

Windows & Doors:

Total Area (ft²)

Total Room/Building:

Area (ft²)

H.M. (BTU/Hr.) - get number from above chart

1. Windows & Doors

2. Net Walls

3. Ceiling

4. Floor

5. Infiltration

Based on:

Disclaimer

	Area (ft²)		H.M.(BTU/Hr.)		Heat Loss
1. Windows & Doors		x		=
2. Net Walls		x		=
3. Ceiling		x		=
4. Floor		x		=
5. Infiltration		x		=

Total Heat Loss for 60^o F Temp. Diff. =
Total Heat Loss for 70^o F Temp. Diff. =
Total Heat Loss for 80^o F Temp. Diff. =
Total Heat Loss for 90^o F Temp. Diff. =
Total Heat Loss for 100^o F Temp. Diff. =

Re-calculate Heat Loss

Heat Loss Calculation Application: Excellent when determining heat loss of a building as a whole.

This calculation will help determine a boiler size for a home.

This is to be used as an estimation. A detailed heat loss should be provided before a new boiler is installed.

* Heating multipliers (H.M.) BTU/Hr based on
60 degrees F Temperature Difference (T.D.)

Procedure

Measure the total length of all outside walls for the house. Calculate gross wall area by multiplying total length by height of the walls.
Measure the window and door area. Select proper H.M.
Record Net Wall Area=(gross wall area minus door and window area) select proper H.M.
Measure the ceiling area and select H.M.
Measure floor area and select H.M. ( H.M. of 4 used over unheated basement )
Multiply Floor area by ceiling height to obtain volume of home and select proper air change factor: 1.61 for Loose House – 1.07 for Average House – .81 for Tight House.
Add the results from steps #1 – 6 to get your home’s total heat loss.