Quote:
Originally Posted by sailor15015
You can hook the supply and return lines up to a half gallon milk jug or something like that and see how long it takes it to empty the container.
|
You may be there for a while if you use a 1/2 gallon.
I don't know the number either, but it doesn't use much. I tend to leave mine running if it's only a few minutes. I wouldn't bother leaving it running very long times unless it was -10 F without a block heater.