Sales Hotline 0844 417 2563

FREE DELIVERY* TRADE ACCOUNT
FREE DELIVERY* TRADE ACCOUNT
My Basket (0)
free delivery * 30 day money back guarantee Trade Account same day dispatch before 4pm *
*On UK Mainland Orders
Please note: Additional surcharges may be payable to the following destinations: Scottish Highlands, Lowlands, Northern Ireland, Isle of Man, Isle of Wight and Jersey.
*Place an order with BestHeating.com before 4pm and all stocked items will be dispatched the same day.
BestHeating Summer Sale

BTU Radiator Heat Output Calculator.

>>  What are BTUs.....?

BTUs are ‘British Thermal Units’, the unit in which radiator efficiency is measured. Factors such as room dimensions, window size and wall material are used to calculate the required outputs of radiators, in order to adequately heat a room.

>>  How do I Calculate the BTUs for my Room?

The best way to get an accurate calculation is to enlist the services of a plumber. However, Best Heating's BTU Calculator is an accurate guide as to what level of BTU and Watt output will efficiently heat your room. Please note: the calculated figure is for the combined heat output of all radiators and/or towel rails in your room (larger rooms may require more than one).

Please enter your information below:

FREE BTU Calulator for your website
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:

Watt/BTU requirements:
Watts Required: 
BTU's Required: 

Trade Account
Trade Account