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Yeah, that's what I do right now - when I remember! That's why I want to automate it.

Thanks to everyone. This is really useful. I had asked about this before on another forum and the basic response was "Why on earth would you want something like that?" I'm very glad to hear that it does indeed exist and I'll do some diligence to make sure I'm buying a good one. Some of them...

Thanks, Mister Banks. I'm only intending to control 2 or 3 radiators out of 13. The rest will stay on as before, which I tghink will mean there is enough circulation not to trip a short cycle. Am I correct?

That's interesting, Rodders. So putting one of Eric's eTRVs on a single radiator won't let me stop that radiator coming on when the central heating comes on? I thought that was the whole point of them: that even though the central heating is circulating hot water to radiators elsewhere in the...

Thanks, both. Yes, Rodders53, I could do a full system upgrade, but as you know, it's not cheap. Madrab: I'm interested to hear that E-TRVs can be programmed independently of any house-wide "smart" system. I will look into this. I believe they are about £70/valve, so even a couple will take a...

You may ask why I would want such a thing. Our home central heating comes on at 4.30pm. But we don't need to heat the bedrooms until 9.30pm. that's 5 hours of wasted energy every day. If we could time the thermostatic valves to come on at 9.30 it would solve the problem. I know I could install a...