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Not sure about battery life (touted as two years with standard AAs - there are workarounds to allow you to use rechargeables) but until the windows are replaced next month, it's not a fair test as no sooner do they get the room up to temp, all the celciusses fly out through the merde fenetres and they have to kick into gear again so will likely be using more power at the minute. There is a whirr from the actuator when the TRVs go on and off, but it's not loud enough to wake you or prevent sleep. So I'd say it's not a problem unless you are super sensitive to that kind of thing.
stevo_com-
workarounds to allow you to use rechargeables
I'd be cautious about using rechargeables for something that's a continuous small drain. I'd expect them to be like smoke detectors.
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touted as two years with standard AAs
Hahaha not a chance.
Rechargeables are a no-no too - they don't have 3enough oomph, amd trigger the low battery warning (which is way too sensitive)
hugo7
NotThamesWater
What's the battery life like as heard there could be issues with that and also noise if you have them in the bedroom?
I'm still contemplating just getting the smart trvs for 4 of the bedroom and hallway rads but spending so much cash on house stuff