I’ve noticed how space heaters and such are rated by how many BTUs they produce, but don’t they really mean BTUs per hour? Isn’t there some unit of time? …just like cooling has to move out so many BTU/hr?
If metric, it’s usually expressed in watts or kilowatts which is, by defintion, energy per unit of time…so I figure it’s the same here.
And, isn’t it the typical unit of time on a per-hour basis? (as opposed to per-minute or per-second?)