On Mon, 07 Nov 2005 10:26:20 +0000, Steve Gouldstone
wrote:

Sorry, I could have been clearer. There is a mains wire going into the
airing cupboard, but it terminates in a thermostat attached to the
outside of the tank. There is no output cable from the thermostat.
Presumably this is meant to continue on to an immersion heater?

More likely than not that is a cylinder stat that controls the boiler.

Immersion heaters normall have a built in thermostat-all they need is
mains power.

sponix