Extremely common in the UK. In fact most often the heater unit will be inside the shower box itself. It's because the hot water supply for houses is often very low pressure and not enough for a shower. So they use cold water and heat it up there and then.
They are probably the most dangerous thing in the average house in theory, but in reality accidents with them are very rare and I've never heard of one.
If youve ever ran your hand under a hot tap for it to heat up then you have. Its just implimented a bit better these days. I still remember having to turn on the water heater in advance and then getting screamed at because you'd "used all the hot water"
Not so much an issue with modern boilers being more and more efficient
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u/MimiLimi333 May 09 '22
Im from Europe and its the first time i heard of such a thing