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I have read the list of suggested things to cover and I have covered them (except for the make of boiler which is a Worcester/Bosch - though this isn't really relevant). I'm after a general explanation of how this sort of system works. Oil-fired combi boiler, pump that powers up whenever a...

We have an oil-fired combi-boiler and a punp that fires up whenever a hot water tap is turned on (whether or not the boiler is on). I've noticed that the shower has some sort of pattern about when it's hot (not often) and when it's tepid, but I just can't work out what that pattern is...