> Honestly not sure why though. I come from a country where hot water came from a tank and it's pressurized to ~3 bar, and showers are glorious. So I don't unde

> Honestly not sure why though. I come from a country where hot water came from a tank and it's pressurized to ~3 bar, and showers are glorious. So I don't understand why they are so popular in some places. A very common (albeit somewhat old-fashioned) plumbing setup in this part of the world is an 'open vented' system where hot water is supplied at comparatively low pressure - a cold water storage tank in the attic provides a pressure head of about 0.5 bar to a hot water tank, which feeds the hot taps. That's plenty for hand washing, but not really enough for a shower. Whereas the electric shower takes mains pressure cold water only - giving you a shower without needing to replace or upgrade your hot water / central heating / boiler system. There are other options (such as a pressure-boosting pump on the hot tank outlet - or replacing the tank with something newer) but changing between types is difficult enough it would usually only be done as part of a complete bathroom refit, which can easily cost $5,000+