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Thanks for all the helpful comments. I have tried the boiler sizer as suggested. That tells me that about 25KW would do. We have hardwood flooring for most of ground floor. Hence, I am a bit apprehensive about a sealed system, in case there are problems under floor. I guess the real weak...

We have an old Ideal E floor standing boiler, probably 20+ years old. This winter the radiators on the extreme ends have gone cold. There is no sludge that is worth a mention. The pump could be on the last legs. Given the age of the boiler, I thought it may be best to go for replacement as...