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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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    Tom Luknar:

    16.81p per kwh day rate

    9.18 night


    Getting a grip on the usage in your installation is going to take some doing, you have a “third rate” free electricity when the sun is shining.


    If you don’t have storage heaters and you aren’t heating your hot water overnight, you are not making use of the 9.18 pence nighttime rate and may be over paying on the daytime rate.


    You may be better of spending a lot of money on storage heaters and/or using the E7 immersion heater if your general daily load matches the output of your solar panels.


    It sounds like you have not been in the house long enough to have bills to work out what’s your usage is.


    It might be a good setup, it might not, we can only speculate. As to how and what the timer does, I cannot tell you.


     Andy B.


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  • 0
    Tom Luknar:

    16.81p per kwh day rate

    9.18 night


    Getting a grip on the usage in your installation is going to take some doing, you have a “third rate” free electricity when the sun is shining.


    If you don’t have storage heaters and you aren’t heating your hot water overnight, you are not making use of the 9.18 pence nighttime rate and may be over paying on the daytime rate.


    You may be better of spending a lot of money on storage heaters and/or using the E7 immersion heater if your general daily load matches the output of your solar panels.


    It sounds like you have not been in the house long enough to have bills to work out what’s your usage is.


    It might be a good setup, it might not, we can only speculate. As to how and what the timer does, I cannot tell you.


     Andy B.


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