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Immersion Heater Wiring.

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A customer has an economy 7 immersion heater to heat water in a copper cylinder. That is all she has to heat the water, one element.

She needs a boost function. Easy I thought. Just install a boost timer control.

But the existing immersion heater is supplied from a non R.C.D. protected off peak board. The booster switch will need to be fed from a 24 hour on peak board. All the on peak boards are R.C.D. protected via one R.C.D.

 

So, what is the easiest way to switch from off peak to on peak boost whilst not getting the neutrals interconnected, and with an automatic default back to off peak after the boost period?

 

I was thinking about a double pole changeover contactor. Is there another way?

 

Z.

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    Sparkymark: 
     

    How about changing the element for a dual element?

    +1. That was the traditional arrangement - the off-peak supply had an element low down (or a long element if top mounted) so to heat the entire tank, the peak supply had a top element (or short element if top mounted) so could only heats the top portion of the tank. Thus the ‘boost’ function could produce a small amount of hot water quickly using the minimum of peak rate electricity. Trying to boost using the bottom/long element wouldn't produce properly hot water until most of the tank had been heated - requiring a lot more expensive peak electricity.

      - Andy.

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  • 0

    Sparkymark: 
     

    How about changing the element for a dual element?

    +1. That was the traditional arrangement - the off-peak supply had an element low down (or a long element if top mounted) so to heat the entire tank, the peak supply had a top element (or short element if top mounted) so could only heats the top portion of the tank. Thus the ‘boost’ function could produce a small amount of hot water quickly using the minimum of peak rate electricity. Trying to boost using the bottom/long element wouldn't produce properly hot water until most of the tank had been heated - requiring a lot more expensive peak electricity.

      - Andy.

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