It is a wet system (hydronic) and the thermostat is connected to the manifold solenoid (240v) controlling flow to the bathroom. Would I be compliant with IET Wiring Regs so long as the thermostat is placed outside Zone 2?

I used a similar thermostat for controlling the bathroom underfloor heating in my previous house without any problems for >10 years, but that was in Switzerland where IET Wiring Regs do not apply. Indeed the electrician insisted on putting all light switches inside the bathroom. The circuits were protected with RCDs, as they will be in my new house.

I used a similar thermostat for controlling the bathroom underfloor heating in my previous house without any problems for >10 years, but that was in Switzerland where IET Wiring Regs do not apply. Indeed the electrician insisted on putting all light switches inside the bathroom. The circuits were protected with RCDs, as they will be in my new house.

Bathroom electrics seem to vary more than most between different parts of the world. At one time, I think Germany liked 10mA rather than 30mA RCDs and liked to have one single c.p.c. for the whole bathroom - whereas the UK much preferred supplementary bonding and until comparatively recently was a lot less bothered about RCDs. I suspect the Swiss practice would have been closer to Germany's than UK. Things are gradually coming together - but there's still likely to be some differences, particularly around sockets and the risks of importing hazardous voltages from outside the bathroom via pipework or c.p.c.s..

   - Andy.

I used a similar thermostat for controlling the bathroom underfloor heating in my previous house without any problems for >10 years, but that was in Switzerland where IET Wiring Regs do not apply. Indeed the electrician insisted on putting all light switches inside the bathroom. The circuits were protected with RCDs, as they will be in my new house.

Bathroom electrics seem to vary more than most between different parts of the world. At one time, I think Germany liked 10mA rather than 30mA RCDs and liked to have one single c.p.c. for the whole bathroom - whereas the UK much preferred supplementary bonding and until comparatively recently was a lot less bothered about RCDs. I suspect the Swiss practice would have been closer to Germany's than UK. Things are gradually coming together - but there's still likely to be some differences, particularly around sockets and the risks of importing hazardous voltages from outside the bathroom via pipework or c.p.c.s..

   - Andy.