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Two separate supplies to an Immersion Heater - advice welcome

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  • 21-06-2015 10:03pm
    #1
    adrian92
    Registered Users Posts: 566 ✭✭✭


    A modern water cylinder. Two separate 3kW elements ( high and low level)..
    One element is connected via 20 Amp MCB on the board ( non-RCD section).
    Other element via 16A MCB on the RCD section.

    Anyone got an idea how to rectify the situation?


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    #2
    brightspark
    Registered Users Posts: 2,637 ✭✭✭brightspark


    You need to get a Registered Electrical Contractor, as it obviously entails working on the distribution board.

    Should be an easy fix for any competent electrician.

    (Assuming both are independent elements, with separate stats, isolating switches etc, I'd probably feed them from two RCBOs), but I'd have to check the regs first to make sure)


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    #3
    2011
    Moderators, Home & Garden Moderators, Technology & Internet Moderators, Regional East Moderators Posts: 12,595 Mod ✭✭✭✭2011


    adrian92 wrote: »
    One element is connected via 20 Amp MCB on the board ( non-RCD section).

    Are you sure that this MCB is not fed from the RCD? It may be installed in the non-RCD section but still wired through the RCD.
    Just a thought...

    + 1 to Brightspark's suggestion to sort it out if required.


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    #4
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    A standard bath/sink immersion switch and one supply can be used.


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    #5
    2011
    Moderators, Home & Garden Moderators, Technology & Internet Moderators, Regional East Moderators Posts: 12,595 Mod ✭✭✭✭2011


    Bruthal wrote: »
    A standard bath/sink immersion switch and one supply can be used.

    That would mean only one immersion can be used at a time. It would be nice to be able to use both at the same time in this case because they are both wired already. My preference is to heat water by other means as eclectically heating water is very expensive.


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    #6
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    2011 wrote: »
    That would mean only one immersion can be used at a time. It would be nice to be able to use both at the same time in this case because they are both wired already. My preference is to heat water by other means as eclectically heating water is very expensive.

    Yea it can be done that way.

    I'm just adding a suggesting another way it can be done, higher element in cylinder for sink, lower one for bath. 6kw would be a big load for a single application in addition to the other possible ones,

    Both on together will heat the water faster. If its bigger than a standard cylinder, that might be useful. If its a standard cylinder, immersion switch and one element at a time would be my preference.


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