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12kW Electric Boiler.

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Helllllooooo,

I have been asked to install  new consumer unit for a couple as they are having a company supply and install a new 12kW Heatrae Sadia electric “boiler”. Has anyone any comments about such a beast. Any experiences of these please? Rather than supply it from a new consumer unit by a B50 M.C.B. I have considered supplying it from a dedicated switch fuse with a suitable H.R.C. cartridge fuse.

 

Thoughts anyone?

 

The makes are based in Norwich. Well I have only just learned that. I have no connection with Heatrae Sadia.

 

Z.

 

 

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  • 0

    12000 watts divided by 240 volts = 50 amps, so you cannot use a standard circuit out of the Onsite Guide.

    Using a 50 amp MCB and 10 mm twin and earth isn’t impossible, but a bit tight.

    I’d ring my electrical wholesaler and ask if they will supply a cut length of 16 mm twin and earth, if they don’t then it’s probably going to be 16 mm SWA or insulated and sheathed singles, because they will cut those to length.

    So having selected the cable based on availability, I’d then do the calculation based on using a B63 MCB.

    But of course you do need to check the manufacture‘s installation instructions.

    You could then do the sums again for comparison using a B50 MCB and 10 mm, but I’d err on the side of caution with this one as the boiler will struggle and run for hours on end.

     

Reply
  • 0

    12000 watts divided by 240 volts = 50 amps, so you cannot use a standard circuit out of the Onsite Guide.

    Using a 50 amp MCB and 10 mm twin and earth isn’t impossible, but a bit tight.

    I’d ring my electrical wholesaler and ask if they will supply a cut length of 16 mm twin and earth, if they don’t then it’s probably going to be 16 mm SWA or insulated and sheathed singles, because they will cut those to length.

    So having selected the cable based on availability, I’d then do the calculation based on using a B63 MCB.

    But of course you do need to check the manufacture‘s installation instructions.

    You could then do the sums again for comparison using a B50 MCB and 10 mm, but I’d err on the side of caution with this one as the boiler will struggle and run for hours on end.

     

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