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Thanks for the reply. I suppose my question is vague as I know very little about central heating and I wonder how such small boiler can heat up a 4 beds detached house efficiently. It does stuggle a bit in the corridor and 1 bedroom where the radiators are not that hot and overall upstairs...

Hi all I moved into a house which has an un-vented central heating system/hot water tank system but the house has 14 radiators and some never get so hot that you cannot keep your hands on them. Is the boiler too small? Cheers David