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  • Next question, our hot water cylinder appears to have 2 power sources, one is just a normal fused switch, and the other comes from a timer. Is it normal to have 2 power supplies going to a boiler like this?

    I assume it's so we don't have to mess with the timer when we want to heat water at unplanned times?


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  • Are you on an economy 7 tariff by any chance? If yes, one will be wired into off-peak circuit, and the other onto peak-rate, the idea being to heat up the water off peak (lower immersion heater) and should it not last long enough, you have the option to heat up during the day too with the upper heater.

    If you're not on Eco7, no idea.

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