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Two electric showers 45A in single property

Discussion in 'Electrics UK' started by jonpatterns, 26 Jan 2021.

  1. jonpatterns

    jonpatterns

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    Hi,


    We are considering installing two 45A shower in a single property (multible showers). I believe the incoming service fuse is 100A.


    The problem is, if both showers plus other devices are used it could exceed the 100A max.


    Would it not matter as it's unlikely both showers used at the same time? I've seen one solution is installing a 'priority' board to prevent both being used at the same time, or a switch arrangement that performs the same function.


    Both showers would be on there own circuits with RCBOs.

    - -

    Is there any scope for additional mains supply, or would this be too expensive, potentially cause phasing issues, or non reg?

    Finally, if both showers were used at the same time could water pressure in an issue?

    Thanks in advance.
     
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  3. AndyPRK

    AndyPRK

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    If the fuse really is 100A, I wouldn't worry
     
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  4. Taylortwocities

    Taylortwocities

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    Yeah, what could possibly go wrong!

    Are you sure your supply is 100A?
    The service fuse cover may have 100A written on it, but that is the maximum fuse. Inside it may be 80 or 60A. Ask your DNO.
    100A is the max for a single phase domestic supply. To go larger, you would need to ask for perhaps a 3-phase supply, but that’s several thousands of pounds to install.

    Better, perhaps, to have one electric shower, and use the existing hot water supply, perhaps with a pump, to provide the second one.

    These sort of showers need mains water pressure and, of course, the pressure will halve if both showers are in use.
     
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  5. jonpatterns

    jonpatterns

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    100A supply fuse question IMG-20210126-01501.jpg 100A supply fuse question IMG-20210126-01501.jpg
    This is the power inlet. Does the 100A here refer to the fuse or max current for the unit?
     
  6. jonpatterns

    jonpatterns

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    Thanks for the advice. Unfortunately, we are on electric heating, so may need to rethink. There is no gas supply currently to house. So maybe electric hotwater storage system and power showers?
     
  7. EFLImpudence

    EFLImpudence

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    Max. current for unit.
     
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  9. ericmark

    ericmark

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    That says the fuse holder will take up to a 100 amp fuse, that does not mean a 100 amp fuse is fitted.
     
  10. JohnW2

    JohnW2

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    ... indeed, and that would seem to be perhaps the most obvious course for you, since it removes many of the questions and uncertainties.

    Kind Regards, John
     
  11. endecotp

    endecotp

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    You can get relays that prevent both showers from being turned in at the same time.
     
  12. EFLImpudence

    EFLImpudence

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    In a single dwelling, you can also decide, arrange and ensure not to use both at once; just like if you only had one shower.
     
  13. Taylortwocities

    Taylortwocities

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    You haven't said where your hot water comes from at the moment, but you could install a largish unvented hot water cylinder and heat the water with an immersion heater, or two.
    You'll then get hot water showers at mains water pressure.
     
  14. DIYnot Local

    DIYnot Local

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