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I have a gas back boiler heating system that is programmed from a acl switchmaster sm400. There is no thermostat on the hot water cylinder and tyhis has been highlighted as a real safety issue. The programmer is difficult to access so before I try I wanted to know if it is possible to...

I have a gas back boiler heating system that is programmed from an acl switchmaster sm400. There is no thermostat on the hot water cylinder and this has been highlighted as a real safety issue. The programmer is difficult to access so before I try I wanted to know if it is possible to...