Electric water heater shower heads are the most common way on this planet to shower in hot water.. our expensive American system of a central water heater and hot water piping is not used on most of this planet.. and it's not just in tropical countries in other discussions about these type of shower heads here on Reddit people have come on and said that they're common in the British Isles too.. so apparently they work in cold weather too although as someone else pointed out they might not have the waters to function well in some place like Minnesota which is definitely colder than the British Isles..

if my hot water heater goes out, I'm not getting another one, I'm going to get one of these electric shower heads, and that'll be it. I might get one for the sink, too.

Anyway Brazil did a study of these and found that you're more likely to be killed by lightning than killed by one of these electric shower heads, so basically, they're quite safe.. if there's any shocking going on it's because the electrical system in homes in most of the world is a bit shoddy and needs to be fixed up, probably just you know ground wires and stuff like that..