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Now have to decide whether to move existing boiler or buy new one with a decent guarantee. One plumber replied back to me saying that he doesn't move boilers as they have more chance of a leak. Would rather keep old one as it's less than 4 years old.

Thanks for the input. I'm not going to push for a bigger boiler if not needed. I've seen how long some of the other forum threads go on for. Another online calc came up with 15.2kW. We'll have big sliding doors & 3 big velus windows so maybe it should be more like 16kW.

Dan, How can I be sure that 18kW is enough? I can't seemd to find a any decent online calculators that allow you to provide enough detail.

Hi, In the middle of an house extension and would appreciate some guidance on boiler sizing. The house is a 3 bed detached two storey house built in 1960s so has small 50mm filled cavity walls. Width = 7m, depth = 8m, double glazed & insulated, room height = 2.4m. Extending two storey 3.2m...