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Old 05-04-2014, 02:34 PM   #11
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Looking at the Owner's manual now, and it shows a "Mixing Valve" on mounted on the rear of the water heater tank. This is a 10 gallon Atwood, dual gas/electric. There's a cold water line feeding into the mixing valve on one side. The hot water outlet is on the other side of this valve. Confirmed that this is the same configuration as is installed once I got the panels off and could take a look at the back of the unit itself. This is an Atwood model GEH16EXT.
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Old 05-04-2014, 02:37 PM   #12
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Quote:
Originally Posted by Crabman View Post
Did you leave the bypass valve turned on (center valve in image below)? If so it will mix cold water with hot and the water will never get very hot. Here are the normal and bypassed valve illustrations.


By George, I think you may have it! I'm going to make a quick run back to the rig, just to make certain that the bypass is indeed closed. If it isn't you'll be able to hear the sound of my smacking my forehead and crying, "Dohhhh...."

Thanks, Crabman...
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Old 05-04-2014, 05:25 PM   #13
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Well, while I'd love to be able to slap the forehead and cry "Dohhh", the water heater wasn't bypassed after all. Did some more checking and I'm pretty well convinced that it's the mixer valve. Turns out from some web research, this isn't an uncommon occurrence for Atwood heaters with this feature, particularly for people running hard water through the system. Deposits get run through the mixer valve and clog it up. As I understand it, this almost always happens at the beginning of a season when people un-winterize and stir things up when filling up their heater tanks. The best defense is to make sure the sediment is cleared out of the tank when draining it at the end of the year. So now it's off to figure out my options to repair, replace, or bypass it altogether.

Fun times. If anyone's got any ideas, throw them my way.
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Old 05-04-2014, 07:32 PM   #14
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I have had 2 rigs with Atwood wh's. Never heard of a mixing valve. I did have 3 valves on the back but they were hot, cold and bypass.

Learn something everyday.
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Old 05-04-2014, 09:36 PM   #15
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Yeah. Mixing valves are only found on the EXT model Atwoods, such as the G9EXT, GE9EXT, GEH9EXT, G16EXT, GE16EXT, and GEH16EXT. Instead of heating the water in the tank to the normal 120 - 130 degrees, these models heat the water to 160 degrees, then mix it with cold water at the water heater outlet to get it down to the standard 120 or so. The idea is that in this manner, you can get 16 gallons of hot water out of a 10 gallon tank. Nice idea, but it's at times like this that the old adage, "simpler is better" rings true.
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Old 05-10-2014, 02:01 PM   #16
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Just to close this thread out, I replaced the mixer valve this morning and lo and behold, hot water! On a difficulty scale of 1 to 10, I'd put this one at an 8 to diagnose, and a 6 to repair once I figured out how to get the access panels off. Now all is good with the world and we're ready to head out for a long Memorial Day weekend!

Happy Trails!
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