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Thanks for your help. I finally settled on a Honeywell DT90E which seems to be a very popular 'stat, and easily installed. Easy when you know how... :wink:

$64,000 question then - which is best? RF is convenient and allows thermostat to be moved easily, something we've not ever done in the 18 months we've had it, or wired which is obviously static. Are there any other advantages with one over the other? Is it ultimately down to personal preference...

[/url] The Sunvic has that type of backplate :-)

[/url] A very grateful thanks for your reply. I have seen Drayton mentioned elsewhere. I have no idea if the Sunvic uses standard wiring? That said, I thought I would draw a diagram and understand better how the circuit is made. I couldn't visualise it in my head at first, but now I can...

I have a dodgy (read: failed) Sunvic TLX 1206. Symptoms were that green "heat required" light would come on, but heating wouldn't. Then it deteriorated into no lights, until I killed the power, waited 30 secs and turned power back on, ad infinitum. Suspected the motorised valve at first, but...