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Please See inserted text in aboveOk so let me get this right:
I have an immersion water tank. With two immersion heaters. YES
A main and a boost. YES
Is that the correct terminology? YES
I only need to use the boost immersion when I have used all of the hot water from the main tank. The only way to switch this off appears to be by the main switch, does that sound right?
YES but most people would have a controller / time clock fitted.