My inherited CH system (about 20 years old) has a single motorised valve so hot water is always on. Was this for simplicity, cheapness or just a limitation of programmers at that time (which I've now replaced)??
Thanks for that. Have to say the Honeywell motorised valve has been very reliable (just easy-fit new motor every 5 years or so) so don't think an extra valve would be such a big risk
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