Got a standard GCH system, one of those where the bathroom rad is always
hot, for some obscure reason the plumber explained but I've since forgotten.
However, I've only just noticed that even with the room stat turned all the
way down, all my rads are still somewhere between warm and very (maximum)
hot. I turned the stat down about 3 hours ago, and a couple of the rads are
still red hot, some are pretty warm and others are lukewarm. Didn't think
much of it during the freeze, but now it's turned milder I was wondering why
the rads were still pumping out heat so much.
I keep the control box set to "always on" for the water and heating, I was
under the impression that it could be controlled by the room stat rather
than a complicated system of on/off cycles which for various reasons, don't
suit me. I have no idea what route the pipes take, but none of the rads have
a thermostat on them, and I've recently had to manually valve-turn a couple
off because the rooms they are in, were getting so hot.
We had the triple-valve (?) replaced a few months back along with the room
stat, could either of these be causing the problem? And if so, do we have
any comeback on the plumber for the (presumably) astronomical gas bill we're
going to get?