"Hzatph" wrote in message
...
Interesting responses thank you. Giving Aga a call sounds a great idea and
I will do that. The pumped system will need to be turned right down so as
not to exceed the modest heat output capability of the Aga which is oil by
the way. I don't really want to run a 240,000 BTU boiler just to heat a
water cylinder in summer. The boiler will feed something like 28 radiators
so the prospect of all being shut down sounds unlikely - a no-flow switch
closing down the boiler sounds much more sensible than a room thermostat
in one room.

Where did the 240,000 BTU boiler come from? What size is your house? or has
an extra nought crept in here?