Originally Posted by
lynx
Check how many wires go to the existing thermostat.
Most of the old mechanical ones only have 2 wires, because they are just a simple switch. If that's the case replacing it with a digital controller will require a complete rewire of the control system. You have to supply operating power and control circuits so it could work out quite expensive.
The alternative would be one which operates via radio signals and powered by batteries.
http://cgi.ebay.co.uk/RADIO-FREQUENC...QQcmdZViewItem
The cost goes up if you want a full control system.
http://www.syxthsense.co.uk/ecommerc...bcategoryID=78
You're right. There's 3 wires going into it, L, S/L, and N (or is it an earth?
), but on looking at the specs for the boiler, the L wire is only Live when the timer switch is set to ON.
Therefore, I'm thinking of getting this one:
http://www.tlc-direct.co.uk/Products/HOSTAT7.html
It says easy to install, no extra wiring required, because the timer functions are powered by 3 AA batteries.
It's not as stylish as some of the others, but I think I'd like to keep it simple, I can't be arsed with fecking about with new wiring.
Thanks for the advice, lynx, gripper, busy, and The
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