No warranty is offered or implied as to the accuracy of this calculator and should be considered as guidence only.
Please select from the options below as closely as possible to your room conditions, we have included as many variables as possible, plus an option to allow your preferred heating comfort type:
Btu's are measured in a number of different ways. We use delta T50 which supplies the most realistic figure for the majority of British central heating systems. If you have a different delta rated boiler feel free to check the btu’s below, simply type into the box which you have BTU figures for.
Many companies list T60 and T70 figures because they look larger when in reality unless your central heating system is running at T60 or T70 you will not get these figures.