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I assumed as a "backup" it just meant it would come on when it needs to. I didn't realise it was a "if your boiler blows up and you still want hot water" kind of backup. I haven't touched anything to do with the system short of changing the timings on the programmer since moving in. I've found...

Hi all, I've just moved into a new house and I'm looking for some clarification on how my hot water system works. I'll explain how I THINK it works, and hopefully someone here can maybe clarify if I'm a million miles out, partially wrong, or somehow correct. It all kind of stems down to a...