@fixitflav There is a room thermostat, when I turn it up the central heating comes on and the rads get warm. When I turn it down the boiler still heats the hot water even though the controller has heating and hot water set to off.
The controller is Sunvic SELECT 207 XLS.
I recently moved into a house that has a Valiant ecotec plus 415 boiler, gravity fed with an hot water tank. To get the boiler to heat the hot water I have to manually set the heating flow temperature (which is the central heating setting) on the boiler itself. The controller we have downstairs...