The Old Radiator Company

BTU Calculator

The efficiency of radiators, old and new, is measured in British Thermal Units (BTU). The dimensions of a room are used to calculate the amount of BTU needed to heat that room. Radiators all have a known and calculated BTU output. Using the BTU outputs in the PRICE LIST it is easy to calculate the size of radiator you need to heat your room.

CALCULATION OF HEAT OUTPUT & LENGTH OF RADIATOR

1. Choose your style of radiator - see Radiator Styles

2. Look on the Price List for the BTU/Watt output per section of your chosen radiator,
i.e. School radiator = 368 BTU per 30" high section

3.     Divide your required BTU output needed to heat your room (as supplied by
         your plumber or ourselves, or see below for help)
        i.e. for 3680 BTU divided by 368 = 10 sections at 30" high School radiator

4. Look on the Price List for the section length of the radiator style you have chosen,
i.e. a 30" high School radiator section = 2.5" (64mm)

5.     Multiply the number of sections needed (see your BTU calculation in 3. above) by
         the length of each section to derive the overall length of the radiator
        i.e. the 10 section 30" high School radiator = 10 x 64mm = 640mm

6. Add an allowance of 75mm at each end for the valves to derive the overall wall
space you will need for your radiator, i.e. 640mm radiator + (2 x 75mm) = 790mm

HOW TO CALCULATE BTU

In the first instance - ask your plumber to perform the calculation for you. Or, ask your butler to ask your plumber.

Don't have a butler? Don't have a plumber and getting nowhere? Telephone us with the dimensions of your room and we will perform the calculation for you or try our new BTU Calculator

THE OLD RADIATOR COMPANY

BTU Calculator