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Well, the 2nd engineer did say that almost all of the new efficient boilers require 22mm even if they are not combi. However, he did mention that fitting a bigger water tank allowing the boiler to heat up more in longer periods of downtime that would provide enough hot water for our needs. I'm...

Hello everyone, For a bit of context - Our 15+ yearold potterton gas boiler started playing up, fairly quick fix, however we thought it'll be better to put that money into a new one, as this one still works. So, we had a few gas boiler engineers come over to have a look at our system - it's a...