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Old 07-04-2008, 09:06 AM   #1
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slow drip behind outside water heater door

So I just noticed this, sitting here having my morning coffee, but when my water heater is fired up, I observed a slow drip of water, not hot, emerging from the bottom of the panel the covers the water heater. Is this normal?
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Old 07-04-2008, 09:08 AM   #2
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It's probably the plastic drain plug weeping. Our water heater (a new Atwood) does the same thing occasionally, maybe a couple of drips every 5 minutes or so, then nothing for a week or more. It all runs outside the trailer, if there is even enough for it to accumulate enough to run anywhere.
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Old 07-04-2008, 09:31 AM   #3
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The drain plug is a common place for a leak but it could also be the pressure relief valve. If you look inside the door you might see a drop of water at either of these locations. The drain is the plastic plug at the bottom and the relief valve should be toward the top on the right side. Be careful with both of these items. The water is under pressure in the tank and it is hot.
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Old 07-04-2008, 09:36 AM   #4
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Quote:
Originally Posted by iHayley View Post
So I just noticed this, sitting here having my morning coffee, but when my water heater is fired up, I observed a slow drip of water, not hot, emerging from the bottom of the panel the covers the water heater. Is this normal?
.

Look very closely at the drain plug and the safety valve once you open the door to the water heater. It is not uncommon for the safety (T & P) valve to weep. You can 'flick' the handle to emit a small burst of water (HOT!!!) to re-seat the gasket in the valve.

If these are NOT the culprits, you have remove your bed platform to check the 2 water fittings at the back of the water heater. These should be 'hand tight' but might have loosened from traveling and might be weeping. Usually, just a 1/4 turn will do the trick, but it is a real PIA to access the rear of the heater.

Have fun!
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Old 07-04-2008, 11:21 AM   #5
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Mine weeps constantly from the pressure relief valve when hot. It drips into the burner assembly which puts the flame out. The heater is constantly relighting during the heating process.
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Old 07-04-2008, 01:10 PM   #6
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Air Gap?

Sometimes a weeping relief valve is caused by a lack of an air gap in the tank. See this from Atwood.
Attached Files
File Type: pdf Atwood Dripping Relief ValvePDF.pdf (286.6 KB, 182 views)
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Old 07-04-2008, 01:45 PM   #7
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Thanks for the PDF. I'll play with it this weekend and see if I can make it stop.
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Old 07-04-2008, 04:04 PM   #8
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ganglin hit the nail on the head.

there needs to be an amount of air in the heater to absorb the change in volume as the water expands.

read your heater manuals regardless of make or model, it is explained fully.

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Old 07-05-2008, 11:23 AM   #9
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Why don't you guys just get an RV-500 and you'll never have a 'weepy' water heater again!!!!
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Old 07-05-2008, 11:45 AM   #10
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Brass plug

Just switched our plastic plug for brass. Our heater is under a year old and I could never get that plastic plug to stop weeping. It took alot of teflon tape, but no more weeping!!!
I also flushed my hot water tank, wow did alot of gunk come out...I would never have guessed that this much stuff could come out in less than a year. This will be a twice a year flush out from now on.
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Old 04-30-2009, 05:39 PM   #11
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We are not terribly handy, please be kind.

We found this thread, as we have a leak coming from around the plastic plug on our hot water heater. If we drain the hot water heater, is replacing this plug (sounds like brass is good) just a simple matter?

Guidance and any suggestions would be greatly appreciated. Thanks so much!
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Old 04-30-2009, 07:09 PM   #12
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The plastic plug just unscrews.
I always put three or four turns of teflon tape on mine and screw it in. When it gets tight I stop. Then when I fill the tank and pressurise the system I check for leaks. If it drips I tighten it a little more. At least with a plastic plug it is very unlikely that you will damage the threads of the tank. That would not be a good thing.
Al
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Old 04-30-2009, 07:10 PM   #13
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I place a bit of Teflon tape on the threads and screw the plug in. No weaps or leaks.
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