We have a combi boiler, and a backup immersion heater
That doesn't sound like a combi boiler then. You may have a Y Plan heating system.
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It is a combi.
Most of the time (always, apart from when something is fucked) the immersion is turned off. As in all electrically turned off by hand.
@Mr_Sworld started
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That doesn't sound like a combi boiler then. You may have a Y Plan heating system.
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