"Paul" wrote in message
om...
Hi,

I've just moved into a new house and found that the cover for my room
thermostat is broken, so I thought I'd better replace it. I don't know
what the model number is, but there is a simple wiring diagram on hte
inside (live, neutral and the wire to the central heating controller).
The terminal that connects to the central heating is number 3 and
marked 20(4)A - do I need to get a new thermostat with the same
rating, or would a 10(4)A be up to the job, as that's the highest I
can find locally. If this isn't enough information, let me know what
else is needed for me to find out.

It depends what load the thermostat is connected to.

20(4)A is a 20 amp resistive load / 4 amp inductive.

What size fuse does the central heating system use, this should give you some
idea of the load.

You might want to consider a programmable thermostat. They cost more but as
well as allowing you to vary the temperature during the day with maybe a
different program at weekends, they also provide a much more precise control of
the temperature.

Michael Chare