Heat Output Calculator
Calculate your room's BTU requirement
Enter your room details below, too find your require heat output.
Please note, this is a guide only. A radiator with insufficient output may never raise the temperature to that required. Outdoor temperatures, external walls, insulation, heated adjacent rooms (i.e. above, below and to the side) all play a part.
The boiler should be sufficient to supply all connected radiators to the sum of their maximum demand.
Larger rooms such as Living Rooms may require more than one radiator positioned evenly throughout the room. If this is the case, divide the required output between the number of radiators needed.
Step 1 Enter Room information
Step 2 Enter Room Dimensions
Please select whether like to provide the room dimensions in meters or feet
Your Calculation Result
This result is shown as a range to compensate for unknown factors such as external temperatures and levels of insulation in your home. We recommend the combined heat output of all the radiators in your room meets the higher end of this result to ensure your room is heated efficiently.