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Old 02-05-2018, 12:10 PM   #1
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Atwood Mixing Valve

2018 27' Flying Cloud. Anyone know if the mixing valve on the Atwood 6 gallon hot water heater is user adjustable?
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Old 03-27-2018, 01:17 AM   #2
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I’m taking mine off tomorrow and will let you know. According to my web searching it is but they plug the adjustment screw with glue at the black plastic cap. Will confirm when I get it removed.
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Old 03-27-2018, 02:21 PM   #3
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I just replaced this valve on my 2015 Classic -- symptom, water not hot enough, reduced flow. The part was $169.

After removing the old mixing valve and installing the new part it worked “as new.”

Then, I decided to take the old one apart. You CAN adjust the temperature: Remove black cap after prying out the center plastic button. Then PULL the larger black cap completely OFF the valve. If you look carefully, you’ll see a pen marking on the adjustment part and the part that does not move. Atwood did that when they set your temp. You can rotate the outer brass part left and right if you want to change the temperature hotter or colder.

The failure of my original valve was due to calcium formation. I removed all three of the pipe connectors, dumped the entire assembly in a mild solution of muriatic acid. It is now like new and will be ready to serve as a spare when the $169 valve gets crudded up.
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Old 03-15-2019, 12:13 PM   #4
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My Atwood mixing valve failed. Is there any reason not to remove it entirely and replace it with a cutoff valve?
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Old 03-18-2019, 01:04 PM   #5
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Good question!
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Old 03-18-2019, 01:33 PM   #6
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The problem is that the water heater thermostat is calibrated to make scalding hot water, then the mix valve cuts that down to a more reasonable temperature for use. This gives you more hot water than the capacity of the tank alone, but adds to the complexity and maintenance issues, as you see.

Not that you canít do this, but it then increases the chance of severe burns if you are not super careful. Personally I donít like the risk. My Atwood didnít have a mix valve, and I replaced it with a PrecisionTemp tankless water heater.
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Old 03-19-2019, 05:33 AM   #7
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Thanks RM I hear yah. The deed is done. We will be careful!
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Old 03-19-2019, 01:57 PM   #8
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Quote:
Originally Posted by Too tall View Post
Thanks RM I hear yah. The deed is done. We will be careful!


Let us know your option after you have a chance to use it.
Thanks!
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Old 03-26-2019, 04:06 PM   #9
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Quote:
Originally Posted by sheriff1 View Post
Let us know your option after you have a chance to use it.
Thanks!
Just back from two days of boondocking and two days of (electric only) camping.
Speaking as a full adult aware that scalding hot water will come on of the faucet I like it better without the mixing valve.
I used less water overall which might sound vague if not for the fact I save dishwater (cold) and add really hot water to it for new life. Also washing my face I'm able to get a decent amount of hot water in the sink bowl using less water overall.
Bottomline, don't try this at home with children. The water is quite hot. Next time out I'll bring a temp. gauge and measure it.
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Old 04-08-2019, 05:38 PM   #10
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Replacing my mixing vavle

I have a 2018 FC fb twin and de-winterized it this weekend. Very little water pressure on hot side faucets. Posted on Airstream addicts and someone said the mixing valve on my Atwood XT HW heater is most likely plugged up. Emailed Airstream this morning and they confirmed this suspicion. Interestingly, they said they get a lot of calls this time of year when folks are de-winterizing. So, I am waiting for my mixing valve from amazon (and the flush wand) and in the meantime i have pulled up the plywood board covering the water heater and previewed my task ahead. The water feed from bypass tube and hot water outlet all unthread easily. I am guessing i will need a plumbers wrench to loosen the mixing valve from the heater itself? There are warning labels on the water heater cautioning that the mixing valve is not "serviceable" and changing the mixing valve can void the warranty. Has anyone captured photos/videos of this procedure they can share? I will also be flushing out the tank before replacing to try and get any remaining sediment from inside the water heater. Thanks!
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Old 04-08-2019, 06:27 PM   #11
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Atwood Mixing Valve

Yup me too. De-winterized yesterday. Spurt of hot water then just like warm / cold and reduced flow despite the tank being hot.

Iím still under warranty, I did call airstream this morning but they said a dometic authorized service shop would need to submit paperwork verifying the issue to get it covered under warranty.

No thanks, Iíll just do it myself, canít be bothered to spend time dragging the trailer into a dealer who has no time for me, only to break something else while servicing the unit.

I ordered a new mixing valve Atwood part number 90029 off amazon for $100 bucks this morning after my call with airstream (the did validate the part number for me).


2 days and the valve will be here and Iíll install myself.

Iíve got to remove the dinette bench and enclosure underneath to get after the valve. Itís just threaded in - hopefully comes out easily
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Old 04-08-2019, 07:09 PM   #12
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Just completed this project. Donít order a new mixing valve yet!
Disconnect the cold water in and hot water out. Make sure pressure is released from system first. The silver portion will unscrew from the brass portion that is screwed into the tank. I used an old fashioned right angle adjustable wrench jut putting it on the body of the valve. That leaves the bronze portion into the tank, use a regular socket on that to remove, as I recall 1 1/8Ēsocket. Thatís where the problem is. This piece is the anti backflow valve and it has a screen on it that will be plugged with the white junk that forms in the tank. I had to clean mine a couple of times before I got rid of the white junk.
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Old 04-08-2019, 07:49 PM   #13
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I spent my $100 + and replaced my mixing valve last Spring. Then (as is often my habit), I decided to disassemble the old one to see ďwhat givesĒ after only 3 years. It was a bit of challenge to take it apart. It was (indeed) gunked up, primarily from passing a lot of hard water that left a nice deposit of minerals. Iím keeping it for a spare. Iím wondering if Iíll go to jail for this. It canít be too much more serious than removing labels from cushions
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Old 04-08-2019, 07:53 PM   #14
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This 6 gallon Atwood has a thermostat. Who can tell me what the factory default is and if there is a "A B C" setting?
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Old 04-08-2019, 08:03 PM   #15
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Atwood Mixing Valve

Sheriff1 - Thanks for the pro tip on cleaning the valve. Iíll do that, soak in CLR or what have you, and keep it as a spare.

Too Tall - Factory thermostat on the Atwood XT 6 gallon water heater is set for 160 degrees I believe. It is not adjustable.
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Old 04-10-2019, 06:07 AM   #16
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Atwood Mixing Valve

Sherrif1 - I did exactly as you said and sure enough that screen was caked up with junk. I have cleaned it out and am soaking it in white vinegar now.

Did you do anything to the body of the mixing valve itself? it seems that the root of the issue is not so much the mixing valve but the screen in the brass piece that connects it to the water heater.

I thought I read somewhere that the "new" mixing valves now come with a more coarse screen as opposed to the very fine screen that is in there now. My new mixing valve is supposed to be delivered today so I will see if it is fine or coarse.

Also- did you use plumbers tape or plumbers putty when you reattached everything?

Thanks!
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Old 04-10-2019, 09:24 AM   #17
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I flushed the body but it flowed water well so I didnít bother to soak it. It was obvious what the problem was. I used plumbers tape but I imagine either would work fine.
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Old 04-10-2019, 11:29 AM   #18
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I have an older trailer with the Atwood water heater. I have a standard valve between the hot and cold where I can allow some cold water enter the hot water outflow so we don't get scalded. It's cheap and works.
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Old 04-10-2019, 05:15 PM   #19
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Atwood Mixing Valve

Replaced my mixing valve today. Pretty straight forward. 2 things I ran into -

1. That valve was really welded on. Had to use significant torque to remove it. First tried a plumbers wrench, which started to mangle the brass fitting. Then used my hand and got the entire valve moving, only to leave the brass fitting still in the tank since it also threads into the valve body. Then back to the wrench and some more persuasion.

2. Second issue was the wood support under the tank had shifted out of place, leaving the tank suspended simply by the screws that attach it to the exterior skin. Yikes! Bouncing down the road would have damaged the skin eventually (someone else on the forum had this happen to them - tore the skin, $5k to replace the entire exterior panel). Put the wood block back in place and wedged it in with a couple screws. Itís wedged in pretty good now - should be good to go.

As you can see in the photos lots of build up so cleaned that all out of the threads using a wire brush and tooth brush.

Re-installing the new valve was fine, screwed right in and got progressively tighter. Itís designed to screw in and basically come to a stop in the correct position, which required some really good hand torque so I feel we are good and no leaks!

Humpty Dumpty is back together again. Yeah! After the Colorado blizzard passes through today and tomorrow we will fill we up on water and head out Friday for 2 days of camping and hot showers.

Iíll clean out the old valve and keep it as a spare. Seems recoverable....
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Old 04-10-2019, 05:18 PM   #20
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Atwood Mixing Valve

Couple more photos.
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