Battery operated thermostat

I've got a 3 channel wired controller plus a radio stat and its mains powered receiver unit spare now...

If that is any use.

Or a PCB with a 15A relay and a Pi Pico and a temperature sensor in it.

Bathroom zoning issue. The sensor location is on the wall reachable from her bath!

I went for a battery version as mains power is managed by the underfloor heating system/time control.

The defunct unit is fitted on the outside of the bathroom wall and wired back to the zone manifold control.

Thst OK. This statt is battery poowered. Tlaks 400Mhz to a mains powereed relay box.

What I have might suit,

It's very simply a battery powered thermostat (Sunvic TLX7506) that talks to a rather large box (Sunvic TLX1206) that contains a mains relay.

It's surplus as I replaced its functionality with Raspberry Pis and clever software and wifi.

Also surplus is a Newlec three zone timed CH controller. (ChannelPlus H37XL Series 2)

Technologically upmarket for my needs:-) But thanks for your interest.

Current thinking is to use the existing buried cable to extend the thermistor leads back to the airing cupboard where I have mains power and can use a conventional unit. Takes the control out of user reach which may be seen as a benefit:-)

We have 7 combined timer/stats (for individually controlled rooms) - they are 21 years old and still work fine. One has had a relay contact fail. I could have replaced the relay, but I just swapped from the heating to the cooling contact and switched the mode to cooling ... whch means that it works fine, but has the operating symbol on, when it is actually off and vice-versa.

The planned solution is to use a simple remote Thermistor operated thermostat. It won't function during *heating off* periods but should do the same job otherwise. Having discovered that the battery powered controller purchased as a replacement had no provision for use with an external sensor, I was tempted to remove the on-board one and connect to the existing.