Originally posted by bruce_miranda
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I figured that if I dropped back to TPI control of the heating zone valve when hot water demand was present (by disabling the overrun when hot water is on) this would avoid this. But I don't think I'll do any of this as I quite like the better temperature control I'm seeing from just letting the heating zone valve do its thing.
Apparently the normal motorised zone valve were never designed to stay open for long durations and hence many don't recommend that they are used for UFH purposes. There are other valves that are designed for that. Problem is most plumbers and electricians swear by the Honeywell valves so will only ever use that. The compromise I guess is to make sure the valves open and close regularly so that they don't seize.
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