Just Cast Ltd
Manchester’s No. 1 Supplier of original Cast Iron Radiators

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 Calculator it is easy to calculate the size of radiator you need to heat your room.

BTU Calculator

1. Select measurement type
Metric (metres) Imperial (feet)
2. Your room dimensions
Height of room:
Width of room:
Length of room:
Window Area x2:
3. Type of room:
4. What is below the room?
5. What is above the room?
6. Select type of outside wall:
7. Select type of window:
8. Select number of outside walls:

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Visit Our Manchester Showroom

We are situated in Oldham, Manchester around 10 minutes from the M60. Our showroom displays a cross section of our extensive stock of reclaimed radiators as well as all the different types of finishes we offer.

To arrange a private viewing to discuss your requirements please contact our sales team on 07745 717 728 or send an email to sales@justcastradiators.co.uk