Calculating radiator size

[Nige]

This has probably been asked a thousand times in this newsgroup, but could anyone tell me how I go about calculating radiator size (in BTUs/Watts) for a given sized room?

Is there a calculation chart available anywhere?

The room I have in mind is a bathroom, approx. 7ft x 7ft square and

8ft high.

Any advice would be gratefully received...

Nigel Lord

[Dave]

There are several downloadable tools, or you can take the simple B&Q approach to get the required output in Btu/hr:

- find room volume in cubic feet

- multiply this by 4 for bedrooms, kitchens and hallways; or by 5 for bathrooms, living rooms and dining rooms.

- add 10% if large windows or "exposed walls"

This sounds crude but the answers seem to be in the same ballpark as a more detailed calculation for the standard modern house situation I've been looking at. Divide by 3.41 to get Watts.

[Nige]

Thanks, that seems to work fine (and luckily, the rad I'd already bought is big enough for the room!)

NL