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Can't find the band but I think, becasue it's an commercial unit, that it doesn't appear on the sedbuk database I know it's 83% efficient. Scottish building regs allow this type to be fitted at the moment. I think it changes next year. This is the model...permenant pilot...

Sorry, my first post was rather vague. Thye original boiler was a 25 year old Thorn. The new boiler is a Potterton Derwent compact A - 4/50 permenant pilot. It arrived ready- assembled. Boiler's fine, just the service that sucks. So.. is power flushing a good or a bad thing? The...

It was indeed 8000 quid. The breakdown of the invoice is: potterton gas boiler - 2468.75 Boiler controls - 192.40 Flue assembly parts - 622.20 circulating pump + speed control valves Fresh air fan, Ducting and fitting - 328.25 Fan control - 87.90 pipe + fittings - 148.30 cabling...

Sorry, this is going to be a long post but we're left with a litany of problems and need any advice we can get. We had a new Potterton Derwent Compact A boiler fitted to our old, and rather eccentric system. Old boiler was in a blocked off fireplace so we had new one installed in cellar space...