Heat requirement calculator
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What size radiator?
Use Castrads' heat requirement calculator to work out exactly how big your cast iron radiator, modern radiator or towel radiator should be.
Room height in metres
Room width in metres
Room length in metres
Total area of all windows in room in metres
2
Type of room
Please Select...
Living Room
Bedroom
Hallway or Kitchen
Bathroom
What is below the room?
Please Select...
Heated room
Soil under wooden floor
Soil under solid concrete floor
Air under suspended concrete floor
What is above the room?
Please Select...
Heated room
A pitched uninsulated roof
Pitched roof insulated 50mm
Pitched roof insulated 100mm
Flat roof uninsulated
Flat roof insulated
What material are the external walls?
Please Select...
Brick Cavity
Insulated Brick Cavity
105mm Solid Brick
220mm Solid Brick
Wood frame
What sort of windows do you have?
Please Select...
Wood/Plastic double glazed
Metal double glazed
Metal Single glazed
Wood Single glazed
How many walls are exposed to the exterior?
Please Select...
One
Two
Three
Watts Required:
BTU's Required: