Okay folks, this is one of those little things that drives me crazy. So, in order to help me not sweat the petty stuff, please tell me which is correct.
My SO and I have always agreed that the appliance supplying hot water is a water heater (whether with tank, or tankless). However, after reviewing some drawings yesterday, in which there is shown a "hot water heater", he questioned if possibly that term is correct. He contended that maybe "hot water heater" refers to the actual apparatus that heats the water, such as an electrical element. In my book, same bloomin' thing. If the water was hot, you wouldn't need to heat it, therefore the proper term is water heater.
What say you?