If it is the standard thermostat that appears when i google that part number i personally would not fit it. I don't know the size of the room but i would not consider it suitable for the environment that you are installing it in for a 'standard' sized bathroom. You could well get tingles off it over time with moisture ingress into the workings and i doubt it would last long either. 

Gary

Is this electric underfloor heating? Don't thermostats for those usually have an additional remote sensor to be sited within the floor to prevent overheating?

Wet systems typically go through a zone controller and most offer 12V versions.

   -  Andy.

Gary - what would you suggest? The bathroom is quite small (2.4m x 1.4m with 2.6m ceiling) but is ventilated with a electrical fan. I don't like the thermostats with LCD displays and the sort of timers that need an instruction manual to operate. The UFH is hydronic so any change in the thermostat setting may take several hours to impact the room temperature and I don't need to set on/off times. For this reason I prefer a simple dial.

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.

1. Generally anything mains powered that is not a 13A socket can go edit just outside Zone 2 so long as you are confident it is not going to be affected by the potentially damp conditions. EDIT inside zone 2 needs the manufacturers say so,  edit and both in and out of zone 2  need a bit of judgement, so the places with most condensation can be avoided. EDIT made new scentance At least in a larger bathroom once you get beyond 2.5m into zone 2 you can have general 13A socket as well...RCDs will always be needed and some bonding might, depending where else that has been done and what the pipes are made of.

Mike.

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.

A wireless thermostat with a receiver the other end would be the easiest option if everything is in place already. There would normally be a floor probe with these then it could go outside.

Gary

Accessories incorporating switches are also forbidden in zone 2. (Which is probably what leads to the widely-held but erroneous belief that you must use a pull-chord light switch in a bathroom.)

Sorry yes - what I meant to say, and mangled somewhat, was that within  Z2 you need to think and check makers recommendations, and outside it less so.

General fused spurs light switches etc are OK outside  zone 2, but you need still to be careful about condensation, splashing from washbasin taps  etc even though not explicitly given a rule in the regs. The sockets being 2,5m are something of an anomaly left over by the tide of pre RCD history.

I have edited the post above so it is nearer to what I intended to say. -it is still a simplification, but at least not actually wrong any more.
Mike

edited to change meaning totally, so it is actually correct. Apologies.

General fused spurs light switches etc are OK in zone 2

Maybe I'm just clarifying the clarification - but zone 2 - i.e. the first 600mm from the edge of the bath or shower tray - does NOT permit LV switches etc. You need to go beyond zone 2 for that (and beyond 2.5m from the bath for ordinary sockets - it seemed simpler when we had a zone 3).

   - Andy.