@Nisse_Hult yes, the water is heated by an electrical resistance inside the shower head. If it is old or poorly installed, it can be very dangerous indeed, but the cost benefit is still very favorable (more than 10x cheaper). Anyway, the manufacturing, isolation and installing rules had become more rigid, so the electric showers became safer.
In fact, a water boiler is not that uncommon, specially here in south Brazil, where is colder. In my parents’ home we always had one, but only because my parents included it while they were building the house. But in rental places (like a summer beachhouse, for example), normally you’ll find only electric showers, because it is cheaper to the owner.
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@Nisse_Hult yes, the water is heated by an electrical resistance inside the shower head. If it is old or poorly installed, it can be very dangerous indeed, but the cost benefit is still very favorable (more than 10x cheaper). Anyway, the manufacturing, isolation and installing rules had become more rigid, so the electric showers became safer.
In fact, a water boiler is not that uncommon, specially here in south Brazil, where is colder. In my parents’ home we always had one, but only because my parents included it while they were building the house. But in rental places (like a summer beachhouse, for example), normally you’ll find only electric showers, because it is cheaper to the owner.