Only a couple of months since we had a new condensing boiler fitted to the existing system. It has always been my way with the old boiler, as I shall do with this one, to use the timer for HW. Our needs are from 7-9am and 5-11pm so I don't want the boiler to be topping up the hot water for the other 16hrs.
For two reasons...
Condensing boilers only work to their claimed high efficiency when working harder... ie cool to hot....
and experience with ours shows it tends to fire up for short periods at a time when maintaining hot water (when none is being drawn). This must add wear to the boiler fan and other parts.... bit like stop-start driving??
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