Replacing Honeywell ST9420C to the Nest Heatlink

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Hi all,
I think I’ve got the general idea about wiring up the heat link. My question is:
What’s the story with controlling the hot water cylinder temp. It’s currently fitted with the Honeywell hot water RF kit, which I guess is all connected through the current programmer?

Only single port valves fitted, so I’m guessing S plan system.
Glow worm ultracom 38hxi boiler
As mentioned. Honeywell st9420c controller
Hot water RF kit
And a guy who works stupid shift patterns and is spending to much on heating when not in!

Thanks for any help.

Neil
 
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You need to buy a new cylinder stat, something like this will do the job

Alternatively, take Nest back and get Honeywell EvoHome. Your existing wireless stat should bind straight to the EvoHome controller, and it gives you the option of adding individual radiator controls if you so wish. Cheaper than Nest too...
 
Thanks for the tips.
It’s a Nest system from a recent move, so I’d like to keep the status quo.

Sorry the link didn’t work. What cylinder stat do I need?
 
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