[Balgair]

I had one of these types of water heaters in an old apartment. Thing worked kinda okay-ish? The main issue was that it was electric and if you used the hot water for really any time at all (bath, dishwasher) then it would pop the fuse from current draws and overheating. Likely this was some issue with the water heater and the electrical system of the apartment.

Still, really annoying when half way through your bath, the fuse would pop, colder water now coming out, and you'd have to completely dry yourself to reset it and wait for whatever got too hot to cool down enough to get the other half of the bath going again.

[porphyra]

Sounds like you're using a totally different type of water heater (tankless) and not a heat pump water heater (which has a tank, so even if the fuse pops, the water won't get cold instantly).

[Balgair]

Nah, same type. The tank was about half the size of a normal one. The water didn't get cold, just not as hot as I'd liked it to be.