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Old 06-28-2016, 04:01 PM   #11
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Thanks. She has been leaving the hot water heater off and taking cold showers so the water should not be hot. Maybe if this works she will at least be able to take hot shower until we can check the fitting.
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Old 06-28-2016, 07:21 PM   #12
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Okay I had her do as suggested but when she opens relief valve only a very tiny bit of water comes out?
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Old 06-28-2016, 07:34 PM   #13
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Okay I had her do as suggested but when she opens relief valve only a very tiny bit of water comes out?
Need to open a hot water faucet at kitchen sink first, then pull relief valve and let water drain until it stops. release relief valve, close hot water kitchen faucet then re-pressurize. This will add air to create cushion in water heater.....
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Old 06-28-2016, 07:48 PM   #14
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Thanks. Had her do that and this time maybe 10-12 ounces came out of the relief valve. Had her go turn off the kitchen sink and turn back on the city water. Then after a few minutes had her turn back on the water heater. Going to check back with her in about an hour to get a status report once the water gets hot. Was still surprised only that amount of water came out but maybe that is normal since she had the sink faucet on too. Thanks again.
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Old 06-28-2016, 08:43 PM   #15
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Cannot visualize how WH affects the toilet input. If you have winterizing valves on the back of your WH are you sure they are turned all the way in the right directions?
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Old 06-28-2016, 09:21 PM   #16
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I know it is strange. I will have her recheck those too but I did check them before she took the trailer to Fl. and all seemed okay.
Note: She tried all the suggestions and it still leaks once the hot water reaches max temp. Not much but enough to wet a couple of paper towels. We have service scheduled for Tuesday. In the mean time she can run the water heater until it just gets warm, not hot and take a shower. I suspect the intake fitting is loose at the toilet. I will have them also check the relief valve outside and make sure that is releasing pressure when it should. On a new RV if this is the only problem we run it to that is fine. lol Thanks everyone for your suggestions and taking the time to try to help. Awesome forum and great people. Once we have an answer and a fix I will update.
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Old 06-28-2016, 09:22 PM   #17
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Cannot visualize how WH affects the toilet input. If you have winterizing valves on the back of your WH are you sure they are turned all the way in the right directions?
When the water in the water heater gets hot, it expands.
When it expands, it also increases the pressure throughout the entire plumbing system.
When the pressure in the entire system increases, it can cause a leak at the weakest point, which in this case is the toilet connection.

This scenario may turn out to not be the OP's problem... but it could be.
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Old 06-29-2016, 09:14 AM   #18
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When the water in the water heater gets hot, it expands.
When it expands, it also increases the pressure throughout the entire plumbing system.
When the pressure in the entire system increases, it can cause a leak at the weakest point, which in this case is the toilet connection.

This scenario may turn out to not be the OP's problem... but it could be.
So, by that analogy opening the cold water side of a faucet will relieve the WH pressure build up. Never knew that.
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Old 06-29-2016, 12:16 PM   #19
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Sorry it didn't work, but at least you're not any worse off. Bummer that she can't reach back there and tighten the nut just a little to see if that stops it.
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Old 06-29-2016, 02:22 PM   #20
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I have a different theory...
You said it happens when you turn on the shower. That implies to me that there is a leak inside the wall from the shower lines, and the water is traveling down the inside pipes and then dripping onto the line that goes to your toilet.
It only APPEARS the leak is coming from the toilet, but it is really the hot water line behind the wall going to your shower that is leaking, then the water travels inside the wall and comes out at the toilet.
This can actually be a blessing in disguise, because if it is leaking and then dripping somewhere inside the coach behind the walls without being seen, you would have a real mess once you discovered the leak later.
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