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Thanks. The boiler is in the garage. Presumably then I need the horstmann frost start. Just to check this would be live to common 2 and com to c. H. 3 on the nest?

Thanks for help. I tidied up the wiring and realise the link between 2 and 5 was broken. Replaced this wire. Now have cylinder thermostat in 6 as above, Essentially I have copied the old wiring from the Horstmann to the heatlink allowing for the different terminals. Now everything seems to...

Sorry if my first post wasn't clear. I never thought that power to the immersion heater was anything other than independent. I was refering the thermostat. And I wasn't planning on leaving the hot water cycling at all. I was wondering if it would be simpler to turn it over to a timed on/off...

Thanks for your reply. Yes I appreciate that the immersion heater can be heated separately from the boiler. I was just mentioning that there is a thermostat on the water tank that appears to be wired into the water grundfos. I was suspecting that this link would need to be removed. I have...

Thank you gentlemen for allowing me to query your expertise. Equipment: grant 50/70 boiler was attached to a horstmann h21xl switch. No room thermostat. Timed on/off. Could only have heating on with water on. Moved in six months ago and thought I'd update to a smart thermometer, because I'm a...