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Old 09-18-2016, 01:44 PM   #1
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Location: Nixa,Missouri
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Low Point Drain 2016- Flagstaff 831 BHDS

The other day is was at the storage checking on our camper and I decided to open both the hot and cold low point drains. I was surprised at the amount of water that drained out of the hot side. It probably drained for close to 5 minutes.

When you open the low point drains where exactly does the water come from? I am almost positive that I opened the low point drains before we left the campground last time and not very much water came out.


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Old 09-20-2016, 08:08 AM   #2
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The only thing I can think of is the hot water tank draining. Possibly last time the hot water tank bypass was closed not allowing water to come out of the low point drain.

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Old 09-20-2016, 08:31 AM   #3
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Also, unless you 'crack' one of the faucets when opening the low point drains, not much might run out. Not opening a faucet creates a vacuum in the plumbing, keeping water in there.

The water from the low point drains comes from the entire plumbing of your rig.
Gravity allows the water to drain out when they are open.

Depending on where the water heater is located in relation to the plumbing, sometimes it will drain the water heater really well, sometimes not. That's one of the reasons it's always advised to remove the drain plug/anode rod on the water heater itself when draining.

Also if the water heater has a built in check valve in the hot outlet, it may not drain well from the low point drain either.
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