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Old 04-03-2017, 08:36 AM   #1
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Hot water draining from cold point drain

Took the new rig out for the first time this weekend and when I was packing up I opened both low point drains. Hot water was coming out of the blue cold water drain after a few minutes. Is this normal?
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Old 04-03-2017, 08:45 AM   #2
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It is possible that it was coming from the WH in a reverse flow. There is no back flow valve on most water heaters. What faucets did you have open. It is always a good idea to drain the WH prior to opening the ow point drains so that any debris in the WH is not sucked into the cold water line and left in there to clog toilet, faucet or shower valves when you use the system again.
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Old 04-03-2017, 08:51 AM   #3
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X2 what Flybob said good info for all campers
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Old 04-03-2017, 09:08 AM   #4
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Check the outside shower to make sure both faucets are off.
Another location to check is the WH bypass valves.
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Old 04-03-2017, 09:20 AM   #5
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Quote:
Originally Posted by Flybob View Post
It is possible that it was coming from the WH in a reverse flow. There is no back flow valve on most water heaters. What faucets did you have open. It is always a good idea to drain the WH prior to opening the ow point drains so that any debris in the WH is not sucked into the cold water line and left in there to clog toilet, faucet or shower valves when you use the system again.
X3. On water heaters without backflow preventers/valves.... When you remove the pressure on the lines, then there is nothing to keep the cold water pushing into the hot water heater, and thus pushing the hot water out into the hot water line.

The water in the heater tank will then backflow back into the cold water line via gravity, and thus out your cold water low point drain.

This schematic may help you visualize it better:

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Old 04-03-2017, 09:27 AM   #6
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Quote:
Originally Posted by Flybob View Post
It is possible that it was coming from the WH in a reverse flow. There is no back flow valve on most water heaters. What faucets did you have open. It is always a good idea to drain the WH prior to opening the ow point drains so that any debris in the WH is not sucked into the cold water line and left in there to clog toilet, faucet or shower valves when you use the system again.


Yes indeed.
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