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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 would assume the immersion heaters don't need a time clock, the bottom heater is presumably connected to the E7 supply and just comes on at night and should be left turned on at all times as it gives you a tankful of hot water heated on the lower priced E7 tariff, the top one is presumably connected to the 24/7 supply and should only be turned on if you run out of hot water as it costs twice as much to run, therefore you only get half a tank of hot water for the same cost as a tankful using the bottom heater. So leave the top heater turned off unless you run out of hot water and need a boost.


    It could be controlled better using a simple push button timer on the top immersion to turn it on for a set time, for example like this so it doesn't get left turned on and as I said the bottom heater probably doesn't need a timer at all.


    I cannot imagine what the ST6400c is doing, unless someone has made up a homespun control unit using relays or it is severely overloaded it cannot be controlling the immersion heaters.


    Andy B.
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  • 0
    I would assume the immersion heaters don't need a time clock, the bottom heater is presumably connected to the E7 supply and just comes on at night and should be left turned on at all times as it gives you a tankful of hot water heated on the lower priced E7 tariff, the top one is presumably connected to the 24/7 supply and should only be turned on if you run out of hot water as it costs twice as much to run, therefore you only get half a tank of hot water for the same cost as a tankful using the bottom heater. So leave the top heater turned off unless you run out of hot water and need a boost.


    It could be controlled better using a simple push button timer on the top immersion to turn it on for a set time, for example like this so it doesn't get left turned on and as I said the bottom heater probably doesn't need a timer at all.


    I cannot imagine what the ST6400c is doing, unless someone has made up a homespun control unit using relays or it is severely overloaded it cannot be controlling the immersion heaters.


    Andy B.
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