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We don’t actually have a boiler to call to, and hot water can run all the time and won’t be connected to the wiring center (as it is a coil through the thermal store run on mains pressure), it will be more or less hot depending how much heat is in the store (depending on solar thermal input or...

So it is basically the HW stat in this diagram and none of the calls for heat from the room thermostats would result in an actuator opening until the HW stat was closed. And in this diagram the boiler would run, but for us it wouldn’t because we have to fire it manually…

Ok good to know it is just normal thermostat, there is no brand or anything on it so couldn’t look up characteristics). At the moment it turns on the central heating (so heating is on when thermostat is set lower than tank temperature), I suppose via a relay somewhere. We’d like to input the...

Sorry my question and photo weren’t v clear! Yes that is the thing that controls the solar thermal loading to the tank, I meant the thing below and to the left of it, which conteols whether the central heating oump runs or not - taking heat from the tank… Sorry!

I’m trying to come to grips with our central heating system so we can add ufh and more sophisticated controls for the existing radiators. This thermostat (white thing with black dial) turns the pump (running 2 radiators and a towel rail) on when the temperature from it’s probe in the tank is...