konastab01-
Is it just the case that in laymans terms it's the hot water but to a plumber it's a loop connected to the boiler that supplies the towel rail.
I'm pretty sure ours is hot in the summer but I've never really felt the need for a towel to be warm in the summer and they usually dry quite well between uses.
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It's all pipes & elbows to me.
What I know is that the towels rails come on when the water is on, and not at any other time, and that there is a zone valve that is controlled by the hot water part of the controller.
What I don't know is wtf is happening with the pipes, having spent the last 30 minutes just staring at them.
Best guess is that I actually have a separate radiator zone for the towel rails, where the zone valve is called along with the hot water & boiler.
Which kind of makes sense, as I poured a bottle of fernox into the towel rad a couple of years ago, so should have realised that it's not fresh water in there.
I realise that saying it was t-d off the hot water was entirely incorrect!
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Airhead
NotThamesWater
You've for me questioning it now, for sure. I'll test it later to see what heats up when.