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Hi I'm after the benefit of your experience, before I go on wild gooses chases. The system is new to me, its an old Thorn Olympic 38/50CF with 5 rads downstairs and 4 upstairs. From searching this forum I think its gravity fed HW, since I can only find one 2 way valve. So far I have...

Hi Problem with central heating, hot water ok Boiler is Thorn Olympic 38/50CF (very old) which has hot water thermostat incorporated under sliding door on front of boiler. Separate timer unit which has "timed", "off" and "constant" switch (switchmaster 300) on wall next to boiler. There is...