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Old 02-27-2013, 10:03 PM   #1
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Hot H2O drip question

Our 2008 international has always had a h2o drip behind the roadside rear tire at the end of water heater heating cycle and just the first heating in the morning. Any thoughts why?
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Old 02-27-2013, 10:57 PM   #2
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Try this from Airstream

http://wbcci.org/general-information...-february-2013

doug k
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Old 02-27-2013, 11:02 PM   #3
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Quote:
Originally Posted by dkottum View Post
If that doesn't do it, add this

http://www.airforums.com/forums/f163...or-100341.html

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Old 02-28-2013, 05:49 PM   #4
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Doug, I'm confused-if the dual powered water heater's excessive temperature build-up is a large part of the problem, why is the accumulator being added to the cold side instead of the hot? I have the same water heater and have been interested in adding an accumulator as a preventative measure.
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Old 02-28-2013, 06:41 PM   #5
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When you first fill the water system in the trailer there is a pocket of air in the top of the hot water tank. If you full time or leave it filled for a long time the air gets absorbed by the water. You end up with a tank totally full of water. Now when you heat the water and it expands there is no cushion of air to absorb the expansion. Remember all your valves are closed. Easy way to fix this is to drain the hot water tank and then refill the system.
I assume the drip is from the over pressure relief valve.
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Old 02-28-2013, 07:45 PM   #6
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Zy, the problem is expansion in the hot water tank. There is no separation of the hot and cold lines in front of the hot water tank, so the expansion just goes back into the hot tank cold water supply. You can put it anywhere in the trailer's plumbing after the pump, but it must be in a cold line, as the accumulator has a rubber bladder that cannot take the heat of the hot water system.

I believe the new style combo electric/propane heaters get hotter than the older propane models, therefore more expansion and pressure. I found two leaks at fittings from this that did not leak using only the propane function. After I added the accumulator I had no more leaks, but when the air bubble is absorbed over time, I think there still may be a possibility. This could be a reason for many internal plumbing leaks, and some not visible within the walls/cabinets.

I used the standard 30 psi charge in the accumulator, but you may have to experiment to see what works.

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Old 02-28-2013, 08:06 PM   #7
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Doug k, I try to leave my fresh water tank full even when the unit will be parked for extended periods. Will the air bubble in the tank be absorbed even when unpressurized by city water or use of the pump?
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Old 02-28-2013, 08:26 PM   #8
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Zy, you got me there, I'm certainly no expert, just posting experience. But I'm guessing some absorption, not as much as when it is used every day.

You could restore the bubble as a matter of prep for each trip, if unsure, easy to do. Adding the accumulator should be under $50 including the additional supply line, and maybe a couple of hours more/less of your time.

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Old 03-01-2013, 08:21 PM   #9
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Thanks Doug for the info, on a mission tomorrow to drain and reintroduce an room for expansion.
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Old 03-01-2013, 09:11 PM   #10
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John, you're probably not doing this in Milaca tomorrow?

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Old 03-04-2013, 07:26 AM   #11
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Nope, we hang out in Fountain Hills Az Oct-May
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