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Old 05-11-2016, 02:53 PM   #41
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No hot water

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Originally Posted by doc73 View Post
Off topic, but do all water heater have a check valve? See,s to be a bunch of folk here that have had the lines reversed that theoretically would mean they should have no water but do?

Mine doesn't. During my changing out of my valve (see post a few above) after all said and done I turned the water back on and ended up backfilling about 1/3 of the tank from the top before I remembered I had closed the bottom valve before draining the tank earlier.

Edit: forgot to mention the bypass valve was also open.... I was trying a lot of things that day.


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Old 05-11-2016, 02:55 PM   #42
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Ok thanks, I did not think mine did either.

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Old 05-11-2016, 03:44 PM   #43
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Atwood water heaters have a check valve, Suburban water heaters do not.
Atwood's winterize utilizing a 3-way valve and the check valve, Suburban's utilize the three valve setup.
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Old 05-11-2016, 03:57 PM   #44
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Originally Posted by Bama Rambler View Post
Atwood water heaters have a check valve, Suburban water heaters do not.
Atwood's winterize utilizing a 3-way valve and the check valve, Suburban's utilize the three valve setup.
Bama, as many of these water heater threads as I have been involved in, I haven't really found that to be the case in my experiences. It depends on how the manufacturers plumbed the water heater and how many valves they used for the bypass operation. They can use either one, two, or the three valve system. The one valve systems (and some of the two valve) usually involve some kind of internal check (aka backflow preventer) valve being utilized, whereas the three valve system doesn't need such.

I was just involved in this thread a few weeks ago, where the member had a Suburban water heater and only one bypass valve. The way this system is setup, is that when you open the bypass/crossover line, it closes the cold water inlet at the same time. There is an internal check valve installed in the hot water outlet, that prevents water backflowing into the water heater.

Here is the thread I am referring to, that has some good member pics.

Water heater/ water supply valve to heater

It sure would make it easier on us and offering advice if there was a consistency in the plumbing across all RV model and/or water heater brands....but I just haven't find such yet.
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Old 05-11-2016, 04:22 PM   #45
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As Wmtire stated, it probably depends on the manufacturer as to how it is plumbed. I have a Palamino with a Suburban WH and they used a check valve on the WH outlet.
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Old 05-11-2016, 04:31 PM   #46
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Well, it makes sense that it's up to the trailer manufacturer on how they plumb the lines going to the water heater, but wouldn't it be up to the water heater manufacturer whether or not the water heater had an internal check valve?


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Old 05-11-2016, 04:37 PM   #47
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Quote:
Originally Posted by Kaadk View Post
Well, it makes sense that it's up to the trailer manufacturer on how they plumb the lines going to the water heater, but wouldn't it be up to the water heater manufacturer whether or not the water heater had an internal check valve?


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Not really, the RV manufacturer does the plumbing, the check valve is there only for the instance that the manufacturer needs it for. Really has nothing to do with making hot water.



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Old 05-11-2016, 05:45 PM   #48
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Quote:
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Well, it makes sense that it's up to the trailer manufacturer on how they plumb the lines going to the water heater, but wouldn't it be up to the water heater manufacturer whether or not the water heater had an internal check valve?


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Mike, all of the check valves I have seen are plumbed at the hot water outlet, but not internal to the water heater itself. They are only internal to the water line/fitting.



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Old 05-11-2016, 05:55 PM   #49
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In the last 4 campers I have had they all had the 3 valves and only one is turned in summer to get hot water. No check valves. Later RJD
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Old 05-11-2016, 06:48 PM   #50
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Quote:
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Mike, all of the check valves I have seen are plumbed at the hot water outlet, but not internal to the water heater itself. They are only internal to the water line/fitting.




Ahh, now I know. I always thought they were internal to the tank. (Not having had one myself.)

External ones then are really nothing more than a valve you don't have to turn and can be easily replaced by a valve if needed.


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