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Old 06-30-2014, 11:25 AM   #1
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Very low water pressure for hot water from pump

Hi All,

Just got our 2012 out of storage, and while sanitizing the fresh water system, I noticed that there is very little pressure on the hot side of the faucet.

When the faucet is full-on cold, the pump revs up and there is decent pressure. When it is full-on hot, the pump runs, but it revving very low. This is most noticable at the kitchen faucet, but happens on all of them.

When hooked to city water, there was a difference between full-on hot and cold, but it was not as pronounced.

My guess is there is some blockage in the hot water line someplace.

Any suggestions on diagnosing and fixing myself? Or do I need to take it in?

We are using it this weekend (don't need the pump) and then again in 2 weeks (definitely DO need the pump).

Thanks in advance!
Jeff
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Old 06-30-2014, 11:41 AM   #2
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From what I understand, the new water heaters that AS install have some kind of a temperature limiting valve located near the top outlet of the heater. I know there is an unfamiliar device there on my 2014 I have never seen before on my older trailers.

The limited information I have read about it is that it clogs up and is to be removed for cleaning fairly frequently, but the posts on the subject seem to say that it is very difficult to remove and clean or service. One of those "do this service, but we didn't give you space or an easy way to do it" jobs.

Now, I may be all wet (so to speak) on this and can't refer you to the threads which mentioned the problem, but your limited flow on the hot water side only issue seems to fit the things I have seen in some other posts. I am not looking forward to the problem solution when my 2014 comes up with it.
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Old 06-30-2014, 12:09 PM   #3
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See if you have an Atwood 'XT' model water heater. PM me if you do.


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Old 10-24-2014, 10:17 PM   #4
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barrettjl;

Were you able to fix the water pressure problem. I have a 2012 Flying Cloud (30ft) and I having the same issue. Any advice would be helpful. Was it the mixing valve? Thanks Jimbo1087
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Old 10-25-2014, 07:44 AM   #5
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Yes, it was fixed. The problem was indeed the mixing valve on our Atwood XT water heater. The part was about $200 and labor was about $200. It took a couple of days because they had to order the part. The Airstream service department said there was no way to clean it once it was blocked; it had to be replaced.

As to prevention, the owner's manual does say to flush out the water heater when it is drained. There were some instructions that on how to do that but it didn't seem like they would work very well. The Airestream Dealer recommended a Water Heater Tank Rinser which we got, but I have not tried yet.
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Old 10-25-2014, 07:54 AM   #6
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barrettji;

Thanks for the information. It sounds like I'll be replacing the valve.
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Old 10-25-2014, 09:18 AM   #7
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You might consider getting a portable RV water softener to take out some of the minerals in the water before it comes into your plumbing system. We use a small one and it works well, she loves it for showering especially. Also use it when filling the fresh water tank.
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Old 10-25-2014, 09:25 AM   #8
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If it were me I would have eliminated the valve entirely and then tried very hard not to scald myself.

I think when we are expected to be stupid or careless at every instance, we generally oblige.

I am near 50 years old and I have never yet injured myself with a hot water system sans a system to protect me.
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Old 10-25-2014, 09:57 AM   #9
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I agree. Get rid of the mixer.


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Old 10-25-2014, 12:04 PM   #10
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If it is not repairable once plugged, mine will be going too when/if this problem hits me. The access is very difficult and the cost of the part ($200... wow) is nutsy. It seems to me that I read something about taking it out to clean it once a year, but that is not going to happen for me, or 98% of the users of this water heater. To remove it for cleaning I would have to disassemble the dinette seat, cut the PEX pipes and re crimp new pipe in place, and stuff like that. Simply is not going to be done, especially on an annual basis.
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Old 10-25-2014, 01:01 PM   #11
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IIRC, an annual cleaning is required with vinegar. It's almost 100% ignored!! You can find the small print in the Atwood owner manual.


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Old 10-25-2014, 02:05 PM   #12
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X2 on the softener! Keeps everything clean and your hair nice and soft!
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Old 10-25-2014, 03:23 PM   #13
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Didn't realize that removing the valve would be a option. In my FC the valve is in the seat well for the dinette and I have easy access to it. I'll be making the repairs. Additionally, I'll be cleaning the tank every six months. Feeling a little embrassed about not thinking about it before now. THANKS to everyone for your suggestions and recommendation.
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Old 10-25-2014, 05:44 PM   #14
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Quote:
Originally Posted by jimbo1087 View Post
Didn't realize that removing the valve would be a option. In my FC the valve is in the seat well for the dinette and I have easy access to it. I'll be making the repairs. Additionally, I'll be cleaning the tank every six months. Feeling a little embrassed about not thinking about it before now. THANKS to everyone for your suggestions and recommendation.
Just be VERY SURE that you realize that your water will be heated to 170F to 180F and not the normal 130F of 'normal' water heaters. You guys can certainly remove the tempering valve if you like but I CAN NOT! I won't even recommend it! Imagine the liability suit I could be hit with if I did that to a customer's water heater and they forgot that the water was now super heated.....even if it was only temporary............NO THANKS!
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