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Yes, sounds like the heatlink needs to be installed upstairs by the boiler and pump. I think I will have to pay for someone to come in and do it now as its beginning to get a bit complicated.

Actually thinking about it, the hot water cylinder and pump is upstairs, so the thermostat wiring should be up there? If so, my boiler and Horstmann is downstairs. How will i connect the thermostat wiring upstairs to the heatlink downstairs without routing a cable?

Ahhh that makes sense, thanks for that, you’re good at explaining!! One final question please, where would the existing thermostats wires be? I’m assuming i need to located them and terminate them to T1 and T2 on the Nest Heatlink to power the Nest Thermostat.

Why would “CH OFF” not have a wire connected to it? When “HW OFF” has a wire connected to it?

Dohhh, sorry i’ve been a bit of a wally! uploaded the incorrect wiring diagram for the horstmann unit. please see the correct image attached.

Thank you for the prompt response Stem. My house has one thermostat which is downstairs, and one hot water cylinder which is upstairs. Does that help? Cheers

Hi Everyone, I’d like to replace my current Horstman Channelplus Series 2 H37XL with a Nest 3rd Gen Thermostat. I’m really confused with the wiring and wondered if somebody on this forum could explain to me what to do please? Thank You