I will try never to have another heating system with TRVs. The ones I've had have been useless.
I've found them very hard to regulate even when they worked, and if there's a room stat (always in the hall where nobody lives IME) then you clearly can't use a TRV there unless you wish to render the others even more useless.
Our present rental has TRVs everywhere except I think the bathroom, and no room stat at all. At least I can make sense of the theory there, but in practice the TRVs are hard to get adjusted and half of them have jammed actuators anyway. And who wants the boiler going all the time which is the only way all the TRVs can have control as opposed to power of veto? We just open them all up, then turn on the heating when we are cold and off when we reach tropical conditions. I shall be glad to see the back of it.
I'm hoping the new house arrangement will just work. It has maybe 12-13 zones, many thermostats, and runs at mains pressure including all the hot and cold taps. I have only a vague idea of how it works. There are no TRVs, because there are no R's, just many metres of what I hope is very robust pipe under the first floor decking and the ground floor fibre screed. The screed is about 90-95mm thick so I expect we'll need to give the system 24 hours notice of when we're going to be cold.
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