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Cheers for replying guys. I have seen the black box type too, but was mainly on about the motor's such as the ones in the Vaillant ecotect range or the worcester cdi range. Just wondered how they worked in heating / hot water mode.

Hello all, I have a query I'd like help with if I may please? A lot of newer combi's use an electric motor on their diverter valves, where the motor when energised lifts the valve to h/w mode, often when a flow turbine first senses flow and via the pcb it activates the diverter valve. When...