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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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    I would be uneasy about use of a 50 amp MCB, hence my earlier suggestion to use a 100 amp switchfuse fitted with a 63 amp fuse.

    I consider a long hour hour load of 55 amps to be entirely possible, due to manufacturing tolerances and supply voltage variations.

    Small and brief overloads by say an electric shower do not worry me unduly, but long hour overloads do.

    If an electric shower has a calculated loading of 40 amps, I would use a 40 amp MCB with a clean conscience, despite the fact that manufacturing tolerances might mean an actual loading of 42 amps at nominal voltage, and 44 amps with a 252 volt supply.

    But for a long hour load a much more cautious approach is prudent. Also, is the stated 12 kw at 240 volts, or at 230 volts.

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  • 0

    I would be uneasy about use of a 50 amp MCB, hence my earlier suggestion to use a 100 amp switchfuse fitted with a 63 amp fuse.

    I consider a long hour hour load of 55 amps to be entirely possible, due to manufacturing tolerances and supply voltage variations.

    Small and brief overloads by say an electric shower do not worry me unduly, but long hour overloads do.

    If an electric shower has a calculated loading of 40 amps, I would use a 40 amp MCB with a clean conscience, despite the fact that manufacturing tolerances might mean an actual loading of 42 amps at nominal voltage, and 44 amps with a 252 volt supply.

    But for a long hour load a much more cautious approach is prudent. Also, is the stated 12 kw at 240 volts, or at 230 volts.

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