>> Is there a Zero on the control knob after the ice symbol?
Yes. So that should turn it off completely. I also found a 'decorators cap' in my shed, presumably from when I fitted TRVs here. Not that it would be suitable I suppose, as I suspect there isn't a standard for these things.
Now I need to figure out a way of draining the rad without staining the carpet with nice, black ferrous oxide.
I did consider fitting reflective foil behind it while it's off, but reading about it, it seems to be most effective on solid, outside walls, less effective on cavity walls and probably no use whatsoever on insulated, cavity walls.
After I sort this room, there's only another seven to do.
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TRVs new
TRVs new