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John D How long does a room have to be before you need two smaller rads? My main room is 18' x 11' , would it be better to have two? Thanks Pete

Thanks John D I will be fitting TRVs to all rads apart from the one in the main room with the room stat. As the one in the main room is on manual valve can you oversize with the rest of the system? My fear being that the main room heats up before the others do, leaving them with no flow...

Hi Is it really worth oversizing the rads on a system with a Condensing boiler? Just worked out that the rads need to be about 25% bigger to take full advantage of it!!! Only seems to suit new builds or places where the insulation has been sorted out. View on this one please. Pete

Thanks Fitz1 I have just tried the Plumb centre one and the figures seem to be around the ones I already have. Thanks Pete

Thanks Fitz1 Just did a quick calc using the site and the figures being given are a lot lower than what I have. Does this calculator take in to account the ventalation losses? or does it just given fabric losses? Cheers Pete

Hi I have tried to calculate the rad sizes but I am just not confident they are correct. Does the figures below seem ok? It's an 1980's first floor flat, roughly 55m2, with uninsulated cavity walls. Inner block wall is made from bubbly looking concrete type blocks assumed a total external...

Hi All Got a major problem with the subfloor in the bathroom. At some time or another there has been a major leak on to the floor and the sub floor now resembles wheatabix. A complete corner on one of the boards has broken off and I can see the concreate base under it. The floor looks to be...