I've been recommended this little tool for calculating radiator sizing http://www.kermi.co.uk/EN/Information/Computer_Solutions/index.phtml
It looks like a fairly sharp tool - and you know what they say about sharp tools in the hands of idiots - but my question is this:
If I can work out what the requirements are for each room, how do I know the output of the old radiators I have? They're about 30 years old as far as I know - is there a formula to calculate it from the radiator dimensions? Or do TRVs make this all irrelevant?
It looks like a fairly sharp tool - and you know what they say about sharp tools in the hands of idiots - but my question is this:
If I can work out what the requirements are for each room, how do I know the output of the old radiators I have? They're about 30 years old as far as I know - is there a formula to calculate it from the radiator dimensions? Or do TRVs make this all irrelevant?