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Tampa
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I will check #1 when the tank cools down a little bit.
Because I just used a generic picture to show a hot water heater and bypass, I’m going to put in pictures of my real system right now.
Would appear that there is only one check valve. Just on the hot water side. It’s a straight pipe in on the cold water side. Is that my problem then?
![[image]](https://i.ibb.co/RBQQJTS/D5-B7059-D-402-C-4-F4-B-8-E58-222944-ADD832.jpg)
![[image]](https://i.ibb.co/YtGB823/CB4-AE269-C864-4310-AF54-1-B3-C6-CA71-A30.jpg)
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dougrainer
Carrolton, Texas
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Thanks, this helps.
1.The top(hot output) is the check valve. The bottom is not a check valve
2. If you did NOT have the check valve on the Hot, in your system, when in bypass mode, the cold water would go UP that center pipe and then flow into the Water Heater from the top. As it is designed, when in bypass, it shuts water OFF to the cold input at bottom, then goes UP that center connecting pipe and when stopped by the check valve will then run cold thru the hot water pipes. So, NO water goes into the Heater tank.
3. I WOULD suggest replacing the Brass check valve. They get mineral deposits and sometimes the "valve" itself gets cockeyed and restricts normal flow.
4. Replace the check valve and I think your problem is solved. Doug
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Bobbo
Wherever I park
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When I de-winterized my Airstream this spring, I was getting little water from the hot water tap. I took a wooden rod and gently tapped on the backflow check valve at the top of my water heater, and the hot water stream increased significantly. I think either that valve had stuck, or some detritus had partially clogged it up. When I tapped it it either unstuck, or the detritus flushed on out.
Bobbo and Lin
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schlep1967
Harrisburg, PA
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As said above, with the pump on, open the pressure release valve. You should get a lot of water coming out. Leave it open for a few seconds to ensure the flow continues. If you do not have good flow there, I would assume part of the broken valve may be in the section between the new valve and the tank blocking water flow. Easy to check by unscrewing fittings and looking. After draining the tank of course.
If you have good flow out the pressure release valve I would unscrew the plumbing from the hot out and check out the check valve.
As for the mixing of hot/cold water, you may have another issue going on. Check your shower to make sure the valves are closed (valves may be open with the button on the shower head turned off). Both the inside shower and the outside "shower". If these valves are left open it allows the mixing of hot and cold.
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Tampa
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Thanks, Doug and everyone.
I have normal flow out they release on the hot water heater outside the RV.
So yeah. It’s the check valve doing something weird. The new one will arrive tomorrow and I’ll update the thread with some results once I get that in.
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AdvancedQs
Tampa
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THREAD RESOLUTION:
It was the check valve on the hot water heater. Now all of the water is coming out at a normal rate, and there is no more weird mixing of hot and cold.
How exactly the check valve did that is still a mystery to me. But I did come out in pieces when I took it off.
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