Load Calculation For Gas Fired Radiant Infrared Heating Commercial and Industrial Applications

The capacity of a gas, radiant tube-heating system depends upon the value of the heat loss. Our program needs to learn some basic building specifications, geographic locations, and the desired indoor temperature.

Complete the following form and our program will create a report with an estimated heat loss for the building, and annual fuel cost comparison between traditional forced air heating versus our gas, radiant tube-heaters.

If at any time you would like help with an item click on the help image Get Help located in various places.

Do not use comma's when inputting information

Specification Information

Prepared For: Name:
Prepared By: Name:

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Winter Design Conditions

Temperature Information
Outside Temp. F
Inside Temp.
Temp. Difference
**For Canadian cities, Inside Temp. must be between 60 and 75.
Degree Day Information
Select nearest city
(Canada at bottom)
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Fuel Information
Select Fuel Type
Natural Gas
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Enter Fuel Cost
(Nat. Gas - $ per Therm)
(L.P. - $ per Gallon)
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Building Specifications


How well is the building insulated?

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Exposed Walls  
Total Exposed Lineal Feet
(Do Not Use Comma's)


Wall Height
U Factor of Exposed Walls

Exterior Windows  
Total Area of Windows

Sq. Ft.

U Factor of Exterior Windows

Exterior Doors  
Total Area of Doors
(Do Not Use Comma's)

Sq. Ft.

U Factor of Exterior Doors

Total Area of the Roof
(Do Not Use Comma's)

Sq. Ft.

U Factor of Roof

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Total Lineal Feet of the Floor


U Factor of Floor
(As a "rule of thumb,"
double equipment size
for wood or dirt floors)

Cold Masses  
Total Weight of Materials
(Do Not Use Comma's)


Specific Gravity of Material

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Time (Hours) to heat up cold mass
1 2 4 6 8 12 24

Infiltration Analysis

Gravity Infiltration
How many air changes occur in an hour?
Mechanical Exhaust  
Mechanical Exhaust
(heating season)
(Do Not Use Comma's)
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Total Heat Loss

Click here to calculate Total Estimated Heat Loss
Transmission Heat Loss BTU's
Cold Mass Heat Loss BTU's
Infiltration Heat Loss BTU's
Total Estimated Heat Loss BTU's

Equipment Sizing

Outside Air  
Are you using outside air for combustion?
(This will be used for capacity sizing. As a general rule, using outside air adds 3% to the total load.)
Mounting Height
What is the mounting height of the heaters?
(As a rule for Infrared heating, for every foot over 15 feet, the total load is increased by 1%.)
Efficiency Information
Select a Model
(The efficiencies listed are "Cyclic" efficiencies. This is defined as an average efficiency for an average system run time (15 min.).)
Omega II® (85% efficient)
Reflect-O-Ray® (90% efficient)

To produce a presentation quality specification

**Note: The heat loss calculation program is derived from data supplied by the user, and our heat loss is intended to provide estimates only. An annual fuel audit would be required to obtain precise fuel consumption data.

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