Siemens thermostat help?

johannis

southcoastrgi wrote: »

So you have a faulty stat or receiver or it it being effected by an outside source & you are blaming the boiler ummmm interesting

Fair enough, I've got an engineer coming out as we are on a plan. Having discussed it on the phone with him it's almost certainly the thermostat or receiver.
All I was trying to do was try to ensure that I didn't spend on one thing to find it was something else...
...so what thermostat do I buy?

Thanks for your time.