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I could be wrong but it's possibly only a call for heat that the thermostat receives/sends so unlikely to be a lot of amps. Not notifiable as far as I know. Obvs switch off power at the Cu and check there's no voltage with a decent voltage tester before messing with the wires.
Airhead-
That ^ when I replaced the roomstat in our last place for a wireless one the wiring turned out to be a phone line, so the draw must be minimal to say the least.
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Thanks - found this:
https://nest.com/support/images/misc-nest-thermostat-eu/gen3-install/3rd-gen-Nest-Learning-Thermostat-Install-Guide-UK.pdfvoltage tester
Any recs?
Chaley
CYOA
Kiddo somehow shattered our hallway thermostat this morning. It was an old Siemens one. Functional but due an upgrade. DIYable? Was looking at nest/ilk. Notifiable? Presuming need to be cautious as will be pokey amounts of power providing the boiler?