[odiroot]

Replacing a thermostat is very easy to do though. And very easy to revert too.

Usually it's just acting as a simple relay (on-off switch) so there's two physical wires.

I've got my Hive thermostat running great with various Bosch and Vaillant boilers. And it works great with HA.

Some newer boilers have 12V "smart" controls but still expose 230V "dumb" call for heating pins.

[Tarq0n]

OP's thermostat wasn't wired, that's why he'd need the electrician.

[mschuster91]

> Usually it's just acting as a simple relay (on-off switch) so there's two physical wires.

Vaillant has a proportional signal as well, and that thing in my old home was 30 years old... [1]

[1] https://www.mikrocontroller.net/topic/126250?page=single

[glitchcrab]

Agreed (I set up our dual zone Nest-controllee heating so I know it's not difficult), but what happens if the landlord visits and isn't happy with you having done this? It would be a pain to have to revert this if you knew the landlord was coming.

[nkrisc]

Check your local laws. You may be allowed to do something like this by law.