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Old 12-24-2015, 04:36 PM   #27
rwidman
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Quote:
Originally Posted by O C Diver View Post
Ok, please explain how you think that works.

Ted
It would but I'm not sure that's the only reason for a check valve.

Looking at the diagram above, if the potable water tank runs dry there is no pressure to empty the water heater through the faucets or shower. Water will remain in the tank.
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