Thats a lame argument. Think about it.

KH

You're right. There's no difference between a cow and a horse, either. Both are
mammals, walk on four legs, eat grass, and are commonly domesticated. Just as
devices designed to transfer heat to the atmosphere and devices designed to
transfer heat from one liquid to another are not different in concept and one
term is properly interchangeable with the other, so it is also a waste of time
to nitpick whether an animal is a cow or a horse. (At least until you want to
go for a ride or get some milk to make butter and cheese).