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Hi spudkey, looked at the boiler and they seem to be 15mm pipes and thinner ones (8mm) going into the radiators. All the upstairs rads and the 1 remaining original downstairs get quite warm though not uniformly hot, varies from warm to almost too hot to touch, but the 4 new downstairs ones...

First thing, thank you to spudkey and bell824 for your advice. With regard the "i" button I don't have any information as to what the codes mean but I will note them doen for future reference. I think it is a 428 model, does that sound right? The F70/72 info is good too though I am sure whoever...

Tony, What gives you the right to publicly slag me off without knowing the full details. At what point did I say the Underfloor specialist did his inspection for free? I paid the going rate to the Vailant engineer and it was he who called in the UF specialist, not me. The arrangement was the...

Until late 2007 we had an efficient heating system, the house was comfortably warm and if you needed more you turned up the thermostat in the hall, the boiler fired, etc etc, pretty much a normal system. In late 2007 we had an ground floor extension to the rear of our house including underfloor...