Heat Output Calculator

What are BTU’s

BTUs are ‘British Thermal Units’, the unit in which radiator efficiency is measured. Factors such as room dimensions, windows and wall type 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?

Our 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).

  • Dimensions of the Room Feet Meters
    Width: Length: Height:
  • Select the Room Type
    Dining Room/Lounge Bedroom/Bathroom Kitchen/ Common Area
  • Additional Factors to be taken into consideration. Does the room have:
    North Facing Wall French Windows Double Glazing