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Thanks It is a wirsbo and it was installed with the system so I would assume that it is made to do that. Some of the Chinese smart thermostats are flagged as being made for UFH so maybe they do the same. Unfortunately they are all 240v so I can't use them!

Thanks. Are you saying that the thermostat that I have at the moment takes that into account? Whenever I use it I can hear it click when I turn it past the current temperature and it doesn't seem to be doing any more than be an on/off switch.

Well it won't work at all since it needs 240V and the wires I have are kicking out 24V! But I don't see how UFH can be any different from anything else, surely it's just a switch activated at a certain temp to open an actuator on the manifold? It hits 21C and closes the switch?

Thanks!

The 240V one? Here https://smile.amazon.co.uk/gp/product/B083XHK8PW/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1

That did cross my mind. I have a 24V one here that I ordered. However the inputs on it clearly state 110-240V It's not a timer (the old one) it's just a room stat. I could try it and see what happens! Anyone have any idea what the different coloured wires going to my stat represent?

Hi I have underfloor heating (water system) and I'd like to replace the room thermostat with a smart one (one of the cheap ones!) However they all seem to be 95-240v and mine is 24V. It's a Wirsbo. The Nest ones seem to be 24V but are 10 times the price. Despite the great fat wires it's...