United KingdomGBP
My Basket (0)
Free Delivery*
*On UK Mainland Orders
Please note: The following postcodes will incur an additional surcharge which will be calculated during the checkout:
Northern Ireland, Isle of Man, Isle of Wight, Jersey, Guernsey, Alderney and the following Scottish Highlands and Lowlands postcodes:

AB1, AB10, AB11, AB12, AB13, AB14, AB15, AB16, AB2, AB21, AB22, AB23, AB24, AB25, AB3, AB30, AB31, AB32, AB33, AB34, AB35, AB36, AB37, AB38, AB39, AB4, AB41, AB42, AB43, AB44, AB45, AB5, AB51, AB52, AB53, AB54, AB55, AB56, AB9, IV1, IV10, IV11, IV12, IV13, IV14, IV15, IV16, IV17, IV18, IV19, IV2, IV20, IV21, IV22, IV23, IV24, IV25, IV26, IV27, IV28, IV3, IV30, IV31, IV32, IV33, IV34, IV35, IV36, IV4, IV40, IV5, IV52, IV53, IV54, IV6, IV63, IV7, IV8, IV9, KW1, KW2, KW3, KW5, KW6, KW7, KW8, KW9, KW10, KW11, KW12, KW13, KW14, PA33, PA38, PA39, PA40, PH17, PH18, PH19, PH20, PH21, PH22, PH23, PH24, PH25, PH26, PH30, PH31, PH32, PH33, PH34, PH35, PH36, PH37, PH38, PH39, PH40, PH41, PH42, PH43, PH44, PH49, PH50.

For further information please click here
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 before 4pm and all stocked items will be dispatched the same day.

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:
Room Dimensions
Width * Height * Length *
Window Area X²: *
Room Information
Type of room: *
What is below the room? *
What is above the room? *
Select type of outside wall: *
Select type of window: *
Select number of outside walls: *

RESET
CALCULATE

Trade Account
Trade Account