My parents' house is heated by a Baxi Bermuda gas back boiler with a gravity fed hot water cylinder and pumped central heating controlled by a wall thermostat. The controller allows hot water, or hot water and heating. The hot water tank is of the indirect combination variety. The gas boiler replaced a Parkray coal boiler and there is no expansion tank or vessel (I think they say it's managed by air-locks), and no cold water tank in the loft.
What do I need to do, please, in order to: a. fit a hot water cylinder thermostat, and b. turn off the water heating so that only the radiators operate.
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