What size radiator is best for my house? Ryans Direct Heating and Plumbing
Calculating BTUs and Radiator Size Guide
9 Feb 11
Buying a radiator takes a bit of consideration. In order to calculate the radiator size you need, you need to calculate what heat output it requires to heat the room and for this you need a Radiator BTU Calculator.
Radiator outputs are quoted in watts and BTUs (British Thermal Units).
This might sound complex, but Ryans Direct are on hand to help pull together some Radiator Sizing guidance…
Calculating radiator BTU’s
Step 1 - Find the volume of the room in cubic metres:
* Calculate length x width x height
Step 2 - Adjust according to room type:
* Lounges and dining rooms multiply by 50
* Bedrooms multiply by 40
* Common areas and kitchens multiply by 30
* Bathrooms multiply by 90
Step 3 - Allow for important variables:
* For rooms facing north add 15%
* For French windows add 20%
* For double glazing deduct 10%
* For very exposed sites, or very cold weather add 10%
* For new builds (that are much better insulated) deduct 20%
This will give you the
output of any radiator in watts.
Multiply this by 3.412 to give the BTU requirement for the room.