In an earlier contribution to this discussion,
Stephen wrote:

Hello,

I was wondering whether to put the bathroom rads on a separate CH
zone, rather than connecting them to the upstairs zone. I'm thinking
this way I could heat the towels in the summer without heating the
bedrooms.

Is this a good idea? If so, how would I control the 2 port-valve?
Normally I would use a thermostat but can you use thermostats in a
bathroom? I'm thinking not because of (i) electrical requirements
(unless outside zone 2 or wireless) and (ii) wouldn't the humidity be
an issue?

Would you just run the circuit off a timer? Could I use TRVs or would
TRVs switch off the rad when the room was warm but before the towels
were warm?

Thanks,
Stephen.

Why not just take a feed from the flow pipe *before* the zone valves? This
way, this rad will get hot whenever one or more zones - including HW - are
receiving heat, and won't need any exta valves or stats.
--
Cheers,
Roger
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