I am going to be replacing my aging Central Heating system (30 years). The current radiators are just single panel and I am thinking od replacing them with double convectors to save space.
Can anyone tell me an easy way to work out what size radiators I need in each room, without employing a heating engineer to tell me.
Years ago, Stelrad gave away a free program (MS-DOS based) that calculated your heat loss, and told you the BTU each room required, as well as offering boilers to suit.
I just had a quick look on the web, and they are charging £20 for it on CD at the moment.
I also remember at our local Plumb Centre they had a cardboard wheel calculaty thingy for calculating radiator sizes. I am sure the nice man at your plumb centre or other supplier would let you use theirs if you were buying from him.
I might have a copy of the old Stelrad program lurking in an old box of disks somewhere...
You could also have a search on the web for "heat loss calculation program". There are a few expensive programs that have free demos available. If they are limited to 1 use, or 30 days, it would be ideal for you.
If your old radiators provide sufficient heat, replace them with new ones of similar output. I was once given rule-of-thumb estimates for old steel panel designs (unfinned) of 400btu/ft2 for singles and 600btu/ft2 for doubles. These rough estimates were at a temperature difference of 100F. Conversion to kW, m2 and deltaC left as an exercise for the reader.
Note that if you intend to fit a condensing boiler, you should base any calculations on cooler water temperatures. I forget the exact figure that is used, but it shouldn't be too hard to find. (It might be 70C against
| >Jimmy | | | On its way, and to Paul | Any chance someone could forward a copy to me too? I've been using the web based calculator on the B&Q website for rough sizings but have no way of telling how accurate the results actually are.
E-Mail address is: seri (at) dextrous (dot) net (I hope that doesn't open the floodgates of spam)
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