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Thanks for everyone's input. So to confirm Whole 3 way Valve was changed with Actuator. Immersion is definitely not running (was checked by engineer & if the tank stat is right down, we get no hot water). I've been doing a bit more observation today - When the Water is 'On' at the timer...

I have a puzzling problem with my heating system. System comprises of Ideal icos HE18 boiler, Grundfos ALPHA2 Pump, Drayton MA1 Actuator, Drayton HT53 Tank Thermostat. To cut a long story as short as possible: I have a system that is generating Hot water that is far hotter than it should be...