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  • We run it off the internal clock, inefficiently, hence wanting to sort a new thermostat. It's about 3 or 4 years old but never installed along with a thermostat

  • Ok in that case look at the set up instructions for the boiler, there will be a row of connectors with two being for the thermostat.

  • Well that's the thing, I have three, a 230V RT and a twin RT marked 24V if I remember. If that's true then I have a low voltage dry contact combi boiler...

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