Hi, i have a dual immersion heater element which is being supplied via 2 separate fcu. These are to be replaced with a horstmann E7 controls. The immersion heaters have 2 separate stats, one element is 2kw & the other is 3kw. My question is which one would be for overnight heating & which one would be for boost? I have had this before & i'm sure it was 3kw for boost & 2kw for overnight. Any idea's
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