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Old 09-02-2015, 11:33 AM   #1
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Water flow issue

I have had this problem since new. The hot water flows much slower than the cold at all locations. I took a look under the hot water tank access door and this is what I found. Could it be the white braided lines they use between the pex tubing and the water tank slowing down the flow? I have checked and replaced all filters and screens. Cold water flows double what the hot water does. When running the hot water, the pump cycles on and off when running whereas it runs continually when on cold.
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Old 09-02-2015, 12:33 PM   #2
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After reading a few threads about similar problems, another symptom occurred to me. When running hot water, I hear a buzzing noise coming from the general area of the water heater. It sounds like water flow is being disrupted or flowing through a restricted space. The other threads talked about one way valves on the water heater. I think perhaps this is my problem. Does anyone know if they are on the inlet to the WH or the outlet? Can i just remove them?
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Old 09-02-2015, 01:27 PM   #3
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Ok, I removed the back flow valve that was on the outlet side of the water heater and it fixed the problem. You can see it in the previous pic I posted. It is the brass piece between the red pex tubing and the white flex hose. I don't understand why they put it there. It restrict the flow and does nothing from what I can tell. Is it OK to leave it out? Removing it fixed the buzzing noise, the pump cycling and the flow issue. Here is a pic of the valve after I removed it.
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Old 09-02-2015, 04:46 PM   #4
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That valve keeps hot water from entering back into the main tank. So your system can supply hot water. Replace it.


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Old 09-02-2015, 05:52 PM   #5
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Originally Posted by mojoracing View Post
Ok, I removed the back flow valve that was on the outlet side of the water heater and it fixed the problem. You can see it in the previous pic I posted. It is the brass piece between the red pex tubing and the white flex hose. I don't understand why they put it there. It restrict the flow and does nothing from what I can tell. Is it OK to leave it out? Removing it fixed the buzzing noise, the pump cycling and the flow issue. Here is a pic of the valve after I removed it.
I just had the dealer remove it, it was put in for the automatic winterizing system. Since I don't use RV antifreeze, there was no point.

If you winterize using antifreeze you need to replace it or put by pass valves in.
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Old 09-02-2015, 06:12 PM   #6
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I have a water heater by pass valve for when I'm winterizing. Does that still mean i have to replace it? There is no way this valve even a new one will flow what it needs to.
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Old 09-02-2015, 06:17 PM   #7
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This valve was on the outlet of the hot water heater so how would not having it on the outlet allow the hot water to flow back to the fresh water tank? I could see that if the valve was on the inlet side.
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Old 09-02-2015, 07:42 PM   #8
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Actually wouldnt it keep cool water from backing into the heater ?
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Old 09-02-2015, 08:07 PM   #9
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The check valve is the difference between a single valve water heater bypass system and a two valve system.
Edit: That should be a 3 valve and not 2 valve for the second option.
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Old 09-02-2015, 08:24 PM   #10
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The check valve is the difference between a single valve water heater bypass system and a two valve system.
+1. In normal mode water flows from the supply line through both hot and cold lines.
When you winterize, you want to close off the inlet to the heater to prevent antifreeze from entering. But you also are connscting the hot water lines to the input, so hey now have pressure. That pressure is now trying to push water (antifreeze) into the heater through the outlet connection.

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Old 09-03-2015, 06:22 AM   #11
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Got it. I was rereading my post and before I got down to yours it dawned on me that when pumping antifreeze into the system it would force it back into the water heater through the outlet without this valve in place. I might put it in just to winterize, would that work? Are there other valves available that flow better? the spring pressure in this one seems very high.
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