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Cheers for that, saved me a few quid and probably saved knackering my boiler..

Yea its a gravity system

Hi, I've just fitted a programable Drayton room stat which works fine, I would like to have the heating on 24/7 and let the room stat control when it comes on and off, the problem is my boiler and timeclock are about 20 yrs old, it is a Thorn Olympic boiler with a Landis & Gyr timeclock which...