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Old 07-08-2014, 11:34 AM   #1
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Only a trickle of hot water

My Itasca 2000 Horizon with the Atwood GCH10A-3E 10 gal hot water heater isn't putting out more than a trickle of hot water.

I have tried both with the on board water pump and shore water with the same results. All faucets are having the same problem. Other posts have indicated the existence of two check-valves (back-flow valves) behind the water heater. I have removed both the round 4 inch cover on the back and the 6x10 cover on the side of the cabinet that holds the hot water heater. In there I only see one brass what I assume is the check-valve and it is on the hot water side. Are there more somewhere else? Also many have posted that the Camco from Walmart will work however that valve has a male and female 1/2 FPT and MPT connectors and mine Winnebago part number 110438-02-000 has only male 1/2 MPT connectors. Those who have used the Camco 23303 did you buy a nipple to make it work or are their other Camcos that have both male MPR 1/2 connectors?
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Old 07-08-2014, 12:02 PM   #2
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This photo was of my 2003 check valve set-up after replacing both. They were both junk. Purchased the correct cables at "General RV". The diagram in my owners manual only shows one valve in the system. Mine had two however. Hope this helps you. Good luck and yes your problem is more than likely tues valves.
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Old 07-08-2014, 12:04 PM   #3
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Old 07-08-2014, 12:45 PM   #4
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When my hotwater heater check valve failed ... I got good flow from the faucets but the water was COLD on both the hot and cold side of the faucets.

I suspect that you have clogged screens on the aerators on your faucets.
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Old 07-09-2014, 05:13 PM   #5
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Thanks to Tomtall for the photos. Since all of my faucets had low flow I ruled out the faucet screens.

It turned out to be the check-valve. The check valve is 1/2 MPT X 1/2 MPT.

Winnebago part number for the check-valve is 110438-02-000.
The check-valve has part number from MPC of G-784.

Both were hard to find so I ordered Camco 23303 from Amazon that is 1/2 MPT X 1/2 FPT and planned on using a nipple to make it a MPT to MPT. While waiting for the part to arrive I discovered that Valterra part number P23415LP is the SAME part as Winnebago and MPC. So I ordered from Amazon the Valterra part.

I hope this info helps the next person with this issue.
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Old 07-09-2014, 05:19 PM   #6
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Woo Hoo

Another problem solved thanks to iRV2. Glad you found the problem.

I meant to say something about the yellow foam in my pictures. I decided the OEM styrofoam box was a poor insulator for the tank due to air gaps so I strategically poked a few pencil holes through the styrofoam an added non expanding insulating foam to encapsulate the holding tank. After hot water is shut down the water now remains quit warm for up to 8 hours.
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