by ericmark »
Sat Feb 16, 2008 10:38 pm
Assuming you have a pump for central heating and the hot water is thermo siphon then you can get some control. Room thermostats with timers built in are now available and a programmer is basely a fancy timer. But to get full control you will need a motorised valve to turn off the hot water. If I am any where near what you are looking for then read the post on zones and do internet hunt for Honeywell "C" plan.