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Thank you for the responses! I figured that reverse circulation might lead to a couple of radiators coming on but surely not every radiator in the house being on full when the water tank is heating up - which is what is happening. I'll get a electrician out to look at the wiring; beyond fitting...

We recently moved to a house with a conventional heating system, with a digital wall thermostat and Danfoss 4033 boiler controls - the classic red and blue tappets! The heating is always switched to ON on the Danfoss, with the wall thermostat deciding whether it is on or off, and the water...