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SMAX · 14 Nov 21, 10:43 AM

If it is a Combi boiler then you probably have preheat switched on. This tops up the hot water heat exchanger every so often so the water heats quicker on demand.

14 Nov 21, 10:43 AM	#4
	14 Nov 21, 10:43 AM SMAX Imagineer
SMAX Imagineer Join Date: Mar 02 SMAX's Reviews Hotel Reviews: 4 Restaurant Reviews: 3 theDIBB Guidebook Pages Created: 13 Guidebook Photos: 69	If it is a Combi boiler then you probably have preheat switched on. This tops up the hot water heat exchanger every so often so the water heats quicker on demand.