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"I found the copy of the installation certificate dated October 2010 and can see that your shower has only a 4mm cable. This has a maximum capacity of 30amps. The 9.5 kilowatt shower will need 40 amps and at least a 6mm cable which has a capacity of 39amps. If you are to upgrade the cable I would recommend a 10mm cable (51amps) as you could then utilise the largest instantaneous shower available which is 10.5kilowatts.
These figures do take into account the length of run or if its trough insulation etc."Go big or go (to a burned down) home!
hippy
mespilus
Don't even ever ask me. IANAE.
But probably.
Do the others say similar with 6s and 16s and stuff at the end?
Regardless, you'll be upgrading at least the breaker and quite probably the cable.