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FWIW, I'm not actually an electricial contractor, trying to get into training for the industry ATM, this picture was nicked from a UK forum

These things have a heater in (the black lump) that is rated at somewhere between 7kw - 11kw (thats at 240v BTW), if you look at the cable supplying it, and compare it to the internal cabling, you can see that its undersized, also flexible cable shouldn't be used for fixed wiring, and where it enters the unit without use of a gland, the watertightness is no more... also having the cable hanging loose in the shower area is... not good

- Adam_151
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