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Old 12-29-2020, 06:46 PM   #1
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MikeandRuth's Avatar
National RV Owners Club
Join Date: Jun 2012
Location: Huachuca City Az
Posts: 281
Hot Water Tank Connection Leak

My intent in sharing my recent repair "opportunity" is to pass along the information to those of you who are full timers with coaches that have a few years of age...

Last Wednesday evening we returned home to find water dripping from the passenger rear corner of our coach. The hot water tank lives in this corner.
My tank is not easy to access. From inside it is under the bottom shelf in our closet. When I replaced the tank several years ago, I cut out the entire entire shelf bottom and fabricated a new 2 piece replacement that gave me access to the entire top of the tank. 16 screws keep it sealed and rattle free...
By the time I got access, the only obvious evidence of the leak was the wet floor. There was a little corrosion on both fittings, but not much. The tank heat had dried everything. In hindsight I should have turned the water back on to source the leak, but I assumed the tank had failed. I looked online at prices and decided to see if I could save all my components and just replace the tank itself.

I pulled it out carefully, and could find no evidence of any failure. When the original tank died, the bad spot was obvious. It was difficult to inspect the PEX fittings but I had already decided to replace them and add on/off valves to both lines. Once I cut the PEX and got the old fittings out where I could get a close look it was obvious the rubber seals were in terrible condition! I replaced both connectors and added my on/off valves. I reinstalled the tank and everything is perfect!
It turns out a neighbor had the same problem recently. He is a retired plumber and thinks that style of connector in a full timer situation where they are hot constantly, is probably not the best choice.
So, my point is that I suggest you add the inspection of these connections to your maintenance list. Nothing fails at 10am mid week on a day you have no plans and all the parts stores are open!!!
The Nilsons
2003 Tradewinds LTC, Dynomax Chassis,
350 Cummins, 2008 Lexus RX400h, 18' PJ Trailer
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Old 12-29-2020, 08:22 PM   #2
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Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 24,962
I keep a pack of these in my tool box ; and replace the cone seals anytime I remove a pex connector .
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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Old 12-30-2020, 12:39 PM   #3
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National RV Owners Club
Join Date: Jun 2012
Location: Huachuca City Az
Posts: 281
Thanks for posting the info on the replacement seals Skip!
I was not aware they were available... I'm gonna pick some up!
The Nilsons
2003 Tradewinds LTC, Dynomax Chassis,
350 Cummins, 2008 Lexus RX400h, 18' PJ Trailer
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Old 02-01-2021, 05:47 AM   #4

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Join Date: Nov 2019
Location: Florida
Posts: 98
Thanks for the info on the seals . I had the same problem on mine.In the process of changing out the 25 year old grey pex.
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hot water, leak, tank, water

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