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Old 11-18-2021, 06:37 PM   #1
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Atwood Water Heater.

Afternoon everyone. I am trying to winterize my m/h. Mine has a separate tank for the antifreeze. When I use the bypass valve on my Atwood the cold water is no problem and winterized but the hot water side of the system has no pressure and I can't winterize the hot side. The tank is a Atwood 10 gallon tank with a single lever bypass valve. Last year it worked reasonably well but only allowed about a quarter of the flow. This year nothing. I think I may have answered my own question. All works well on hot water side except when I use the bypass valve. Must be in the bypass valve. Any other suggestion are welcome. Thanks in advance.
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Old 11-18-2021, 07:21 PM   #2
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Quote:
Originally Posted by Fourwinds93 View Post
Afternoon everyone. I am trying to winterize my m/h. Mine has a separate tank for the antifreeze. When I use the bypass valve on my Atwood the cold water is no problem and winterized but the hot water side of the system has no pressure and I can't winterize the hot side. The tank is a Atwood 10 gallon tank with a single lever bypass valve. Last year it worked reasonably well but only allowed about a quarter of the flow. This year nothing. I think I may have answered my own question. All works well on hot water side except when I use the bypass valve. Must be in the bypass valve. Any other suggestion are welcome. Thanks in advance.

Agree it is likely the valve.

Typically, if there is only one valve to turn, it is a two way valve. In one position, cold water flows into the WH, fills it, gets heated and flows out the hot water lines. Turn the valve, and the cold water is shut off from the tank and directed to another line that connects to the hot water outlet line, and cold water flows through the hot water lines. Cold water cannot back flow into the tank because there is a check valve in the water heater outlet port.

Now, in your case, with only one valve, it may be faulty and is not allowing the water to divert to the hot lines, but still cuts the flow to the tank. Could be an O-ring jamming the diverter port.
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Old 11-18-2021, 09:07 PM   #3
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Sounds like a build up of minerals. In WH bypass setups there will be at least one check valve on the hot water outlet at the top of the WH. This explains the low flow of the hot water line, but not why no antifreeze when pumping it.

I've never seen a tank for for RV antifreeze. Could have been a mod. What is the capacity of this tank? Is it located before the water pump, between the fresh water tank and the pump?

There may be second check valve past the T on the WH's hot line.

Usually there's a three way valve like the WH bypass valve to select between antifreeze and fresh water.

Check valves are cheap and be replaced. Alternatively you can remove them and soak in a strong bath of vinegar overnight or longer to dissolve the mineral build up.
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Old 11-19-2021, 08:55 AM   #4
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Atwood Hot Water Heater

Thank you for the help.
The 2007 Triple E Empress Elite has a built in tank to hold the antifreeze. It is a three gallon tank and is control in the wet bay along with the other controls for water pump and city water. Four controls for what needs to be done and two settings allows you to draw from the Antifreeze tank and either winterize the whole pressure system or winterize the hose for the city water. Nice system. Thanks for the advice and I will have a look at both valves starting with the bypass valve. I will keep you posted on how the fix goes.
Thanks again. Stay safe and healthy.
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Old 11-19-2021, 11:03 AM   #5
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Yes indeed do that issue nice system. Many people forget to winterize the section of pipe for the city water and black tank wash.
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Old 11-23-2021, 12:15 AM   #6
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Re Hot Water Tank issues

I think I have resolved the problem and you were right it was the mixing valve. I have ordered a new one and hope that solves the problem. Some folks said you can try cleaning it but doesn't away last and for the amount of work I thought it would be easier, not cheaper, to replace it. I made a jumper hose for to by pass the hot water tank so at least I can winterize the motor home before the cold weather sets in. Thanks again for your help and suggestions. It is appreciated.
Mel Kraft
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Old 11-23-2021, 11:41 AM   #7
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Originally Posted by Fourwinds93 View Post
I think I have resolved the problem and you were right it was the mixing valve. I have ordered a new one and hope that solves the problem. Some folks said you can try cleaning it but doesn't away last and for the amount of work I thought it would be easier, not cheaper, to replace it. I made a jumper hose for to by pass the hot water tank so at least I can winterize the motor home before the cold weather sets in. Thanks again for your help and suggestions. It is appreciated.
Mel Kraft
So you have an XT model...mixing valve on backside attached to Hot out
Cold inlet valve OPEN...water flows thru WH Tank/Hot out and cold water to mixing valve
Cold inlet valve closed ...water flows thru mixing valve into hot lines

Mixing valve clogged...no flow


Bit different system then standard WH Bypass


So this is what you have?
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Old 11-30-2021, 04:14 PM   #8
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Re Hot Water Tank issues

Yes that is the tank I have. I ordered a new mixing valve. I pulled the old one apart and there was a fair amount of calcium build up inside and I think that ruined the valve inside. Also noticed bits and pieces of "O" ring debris inside. So, even if I had not damaged the threads taking it off I would have had to replaced it. Thanks for your reply's.
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