re: imagine the same hose sitting in the kids' wading pool (after
they've used it for whatever kids do), or the muddy pool of mulch near
You now, the more I thought about your comments, the more I doubt it
would be an issue in my case.
Let's start with the fact that the only time the hose could suck water
out of the pool/puddle is if the hose was open. Now, if the hose was
open and both the hot and cold water were on, then the force of cold
water would be pushing water *out* of the hose, not pushing the hot
water back into the house. If this weren't the case, I would never had
be able to fill the wading pool with warm water or for that matter,
ever get warm water out of the hose, which I do.
The only time the problem occurs in when the hose end is closed and
the cold water has no place to go but back into the house.
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