me big smartass,.. I've mostly heard, "hot water heater".

No señor, sólo americano, no permitimos que esa clase de mierda extranjera aquí abajo en el oeste.

I want extra salsa with that order

ok,.. Mierda extranjera, with extra salsa,.. enjoy

Both. You made me a bit curious so I decided to look a little deeper and see that a lot of the appliance stores/chains have both "hot water heater" and "water heater" in their meta-tags. What I find interesting is they also have "tankless water heaters" as well.

Have you guys seen heated floor systems? There you have a "boiler" heating the water instead of a "hot water heater/water heater" and it's stored in a circulation tank.
My fridge has a water dispenser, but it's not called a "cold water dispenser."
The water cooler at work has hot water.

Sounds like you have a lot of time on your hands

Happens occasionally. I appreciate you taking the time out of your day to point it out--to no inconvenience, I hope.

I like to check out the activities of the residents of Bizzaro World now and then.