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Immersion heater - economy 7 timer wiring

Former Community Member
Former Community Member
Hello,


I have a honeywell st6400c controller and an immersion heater. 

My heater has 2 switches, off and on peak. My concern is that the heating works only with both switches on. Even if its set to trigger at off peak time only, which it does, both switches light up and if I switch off the onpeak one, the heating stops even tho the offpeak is still lit (testing this at off peak hours ofc). Is this correct ? does this not use much more electricity? I was monitoring this and Im sure it goes against the "night" hours, but my worry is that it uses much more power than it should.

Thank you for your advice

Tom
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    I think most E7 systems charge everything at the off-peak rate overnight - so an off-peak supply can sometimes be emulated by using a single 24-hour circuit and a time switch that only switches on during the overnight period. That saves running an extra cable and so on, but has the disadvantage that if your clock and the supplier's get out of sync you can inadvertently end up using electricity at the peak rate instead - or indeed get into a right tangle if the user doesn't understand exactly what's going on and tries to re-program their clock.

       - Andy.
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  • 0
    I think most E7 systems charge everything at the off-peak rate overnight - so an off-peak supply can sometimes be emulated by using a single 24-hour circuit and a time switch that only switches on during the overnight period. That saves running an extra cable and so on, but has the disadvantage that if your clock and the supplier's get out of sync you can inadvertently end up using electricity at the peak rate instead - or indeed get into a right tangle if the user doesn't understand exactly what's going on and tries to re-program their clock.

       - Andy.
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