On 9 Oct 2020 at 09:10:55 BST, "Roland Perry" wrote:

In message , at 08:02:19 on Fri, 9 Oct
2020, Andy Burns remarked:
Roland Perry wrote:

Andy Burns wrote:

I'd use a programmable thermostat in the living room then either
remove the existing timer, or set it "on" 24x7.
Sounds a bit complicated.

If you don't want the wifi integration fair enough, the models without
that are certainly not complicated, e.g.

https://www.thefloorheatingwarehouse.co.uk/acatalog/info-Slimline.html

Could I wire that with one pair of conductors to the boiler? How is it
powered. The site above has very little [actually, none] installation
detail.

As mentioned elsewhere, you need to know if your controller is working at
mains voltage or some extra low control voltage generated by the boiler. A
simple two wire room thermostat (in series with one of your two cores - the
other wire can be left intact or rejoined if the two core needs extending) is
the only thing that is guaranteed to work without further investigation.

--
Roger Hayter