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Many thanks CountryFan. Fitted it this afternoon and all's well.

Makes a lot of sense. So something like this? Many thanks

Of course. I got the HW version because it was the same price as the plain T6R, and I may be moving soon so thought it might come in handy in future. Many thanks for the advice. Not entirely sure I understand what your "Heating" refers to on the T6R. Can you clarify?

Hi all I am trying to connect a Honeywell T6R-HW smart thermostat to a Greenstar 29CDi boiler. Before I start, I want to be sure I understand what connections are required, and it isn't helped when the connection labels are different from the two makers' tech docs. Does anyone know exactly...