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The Natural Philosopher

John Rumm wrote:
wrote:
On Jan 22, 1:48 pm, "John" wrote:
"Do not see any screws anywhere. The round dial knob may be coming off,
but will wait for the plumber "

I thought Plumbers fix pipes - electricians will know about
thermostats as
they are an electrical switch.

That did suprise me and worries me.

I am giving him for the present benefit of doubt that he does not know
how boiler is connected to other components of heating system.

Well in the grand scheme of things the heating wiring may be not
familiar to an electrician, however the wiring at the stat usually
follows one of two options - both will have live in and switched live
out, older stats may also have a neutral as well.

Newer stats you mean.

If you want power for digits, or a stat with less hystersis,or a better
switchover (with electronics/relay), you need the neutral.