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Old 12-04-2019, 09:46 PM   #1
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2016 26' Flying Cloud
Wherever , Texas
Join Date: Jul 2015
Posts: 444
Question about mixing valve

Just returned from trip where we had issues with getting hot water flow. All seemed to point to mixing valve. Took twin bed apart to gain access. Everything looked clean, so I reinstalled it. It worked normally! (I hate it when that happens). Just to be on the safe side, I want to buy a new one. We have the 6 gallon water heater, but it seems that all the valves I have found are for the 10 gallon water heater Are they the same valve?

2016 Flying Cloud 26u
2017 Silverado Duramax 4x4
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Old 12-04-2019, 11:46 PM   #2
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2017 30' International
Broomfield , Colorado
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Question about mixing valve

You want an Atwood 90029 mixing valve. They are $120 on amazon. Good to go with that one for your Atwood 6 gallon XT water heater.

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Old 12-07-2019, 03:58 PM   #3
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2018 25' International
Slidell , Louisiana
Join Date: Sep 2017
Posts: 182
Mixing valves can get hung up on a bit of silt or more commonly mineral (hard water mostly) deposits. So if you removed it and flushed it and it works fine, there is not much justification to replace it. The new one may be just as likely to have the same issue later. If you don't use a filter on all water going into your unit, you should. If you mostly camp where there is hard water, consider a portable softener though they can cost up to $400.
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Old 12-08-2019, 06:05 AM   #4
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2018 27' Globetrotter
Hanover , Pennsylvania
Join Date: Mar 2014
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I had a mixing value problem last year and had to replaced it.

Three things I've done different this year in an effort to prevent a reoccurrence:
1. Bought a plastic flush wand like this one ( and thoroughly flushed the hot water tank.
2. Filled the hot water tank slowly to prevent any remaining debris from circulating in the water.
3. Wait for a few minuted before turning on hot water faucet again to let any remaining particles settle to the bottom of the tank.

Step 1 was done when winterizing and steps 2 and 3 were done when I de-winterized. Not sure that step 2 and 3 are necessary but I did remove a lot of debris using step 1.

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