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Old 11-12-2013, 03:15 PM   #1
Junior Member
Join Date: Jul 2013
Location: Utah, USA
Posts: 18
Hot water bypass valve

I saw something about this on a thread but can't find it now. When I suck water from a bucket with the "inlet to pump" selected, I get water flowing back in to the hot water tank, whether I have the bypass valve open or closed. It's a brass valve and seems unlikely to have failed, as ball valves are pretty simple. Is there a built in back flow preventer valve on the hot water heater inself? Near as I can tell, the line that would take the antifreeze into the main hot water line and distribute it to the coach tees onto the hot water line coming from the tank to the coach. If this is the case, then any pressure on that line is going to backfill the hot water tank unless there is a valve to prevent it. Any thoughts?
2003 Dolphin 5255

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Old 11-12-2013, 03:43 PM   #2
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Ford Super Duty Owner
Jayco Owners Club
Join Date: Feb 2012
Location: Long Island, NY
Posts: 221
Many RVs use three valves for a hot water bypass. The first valve shuts off the water going into the heater. The second valve shuts off water leaving the heater. The third valve allows the inlet water to go directly to the outlet pipe thus bypassing the hot water heater.. The first and second valves prevent any water from going into the hot water heater. I hope this helps.
2016 Jayco Greyhawk 29MV
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