Reduce water hammer sound by slowly closing the radiator valve
If the radiator valve would be closed more slowly, this would significantly reduce the amount of sound produced.
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I do not know whether that can be done but if it bothers you, you could add a short episode of reduced temperature at the end of each heat schedule so that it only ever turns off from reduced output.
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Thank you for the suggestion, but the valves close regularly when the requested temperature has been reached, not only when the schedule ends. It's always a surprise when it happens, mainly in the middle of the night it can be quite startling0
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@Silvan I am no tech expert but the speed of closure is governed by the design of the motor; the battery power available and by a spring and the amount of system water pressure those two issues have to 'fight' against. You add to that the distance it has to travel.
If you are saying you are getting water hammer when closing from 1/3 open (it wouldn't close from fully open) is your system pressure too low or your valves very old?
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I had a similar experience. Not 100% sure what it was but really loud banging twice in one day (when system first set up). Seemed to be when the upstairs radiator was one of the only ones active. I do have two radiators that don’t have thermostatic valves on. One in my bathroom and one in the living room. They basically come on whenever the heating is on. I opened fully the valve on the living room one and the bathroom one slightly more. The system is still balanced (all radiators work) and the thumping has never occurred again. Might have been the combi pump, or water hammer? In any case the issue went away(3 months ago). I think having the two radiator valves opened has release pressure so when a Tado valve closes and the pump is at full, the resistance doesn’t now cause thumping.
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