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Old 06-28-2016, 09:36 AM   #1
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Toilet leaking only when hot water heater turned on?

Crazy as that sounds its true. New Freedom Express 29' travel trailer has developed a leak at toilet. Does not leak as long as the hot water heater is off however when hot water heater is turned on to take a shower there is a leak and puddle found behind the toilet. Traced it up to what seems to be the water intake of the toilet even though can't be sure. Any thoughts?
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Old 06-28-2016, 09:40 AM   #2
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Does sound crazy but not out of the realm of possibility.

I believe your plumbing system is incurring an increase of water pressure when the water tank heats up and expands the water. Sounds like a simple tightening of the inlet pipe on the toilet should do the trick.
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Old 06-28-2016, 10:00 AM   #3
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Thanks. We just set up an appointment to have someone fix it. I am not there and my Wife is the only one staying in the trailer right now. She says she can not reach or get to the fitting so I presume the toilet will have to be removed. Think the service call will be covered under warranty too. I agree that the extra pressure is what is doing it. Thanks again.
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Old 06-28-2016, 02:45 PM   #4
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You might have her check the pop off valve behind the outside water heater door to see if it drips when the heater is on. If it does you may have lost the air space in the heater. To restore it, just turn the heater off and let it cool down and pull the lever to let some water out and some air into the heater tank.
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Old 06-28-2016, 02:59 PM   #5
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I certainly will. Could this be the cause of the problem? Lastly would she need to empty a lot of the water? Thanks for your help.
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Old 06-28-2016, 03:13 PM   #6
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There's not much air space in there so there won't be much water to empty. Half a gallon of less.

It could exacerbate the problem. The air space in the heater is there to absorb some of the expansion of the water when it heats to keep the system pressure from rising too much. If there's no air space, then the external plumbing has to absorb the pressure rise and that could cause a leak in a weak spot in the plumbing. In your case it appears to be the toilet valve connection.
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Old 06-28-2016, 03:23 PM   #7
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Makes good sense. I will have her check when she gets to the trailer tonight. Question. Instead of heating the water first and then checking for a leak at the valve can I have her just go ahead and empty some water at the valve and then turn the water heater on to see if that may have helped? Or should she heat the water first and then check the valve for a leak? Also while water is being released should the city water be turned off? Thanks so much for your time and help.
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Old 06-28-2016, 03:38 PM   #8
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Either way works to create the air space. It's probably easier to have her turn the water off and pull the lever on the pop off valve prior to heating the water.

Then she can turn the water on and then turn the water heater on. Then she'll know if it helps the issue. Even if it stops the leaking, you should check and tighten the fitting a little when you get a chance.
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Old 06-28-2016, 03:40 PM   #9
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Thanks I will let you know the outcome. Been a big help.
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Old 06-28-2016, 03:55 PM   #10
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In case you missed it... BAMA said to let the water heater COOL DOWN!

Just tell her to BE CAREFUL when opening the pop-off valve. That water can be SCALDING if it hasn't cooled down!

As mentioned... she'll need to turn off the city water or the pump beforehand too.
Otherwise it will pump as much back in as you are trying to remove.
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