NC - someone remind me please.

[tabbypurr]

1. Bimetal wallstats are/were used for cooling as well as heating.
2. The other contact can be used to redirect electrickery to heating water if it's a room stat, or vice versa.

NT

[Theo]

Thanks. So in a traditional heating system, where the options were hot water or hot water+heating, you would always be running the boiler and using valves to put either heating water (when the house was cold) or hot water (when the house was warm enough) through it, until such time as the hot water came up to temperature and the boiler would turn off?

Theo

[dennis]

The fan doesn't run as the OP said.

[tabbypurr]

there's a bit more to it than that. There are several classic 'plans' for CH.

NT