[Fightin Whitey]

Water heater.

Hot water heater.

Nonundisirregardless of what you say.

[TBP]

1. Is the water heater itself hot? if not, it’s not a hot water heater.

2. It heats water to make it hot. That means it’s a water heater, not a hot water heater.

3. It doesn’t heat hot water; hot water is already heated.

Just use water heater.