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Old 06-20-2015, 02:13 PM   #1
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Leak in feed to hot water heater

I've discovered a possible leak between the water manifold and the Atwood tankless hot water heater in my 2015 Berkshire XL 40BH. Does anybody know the accessibility to this line? I can't get the unit into the dealer for 3 weeks and I'd like to figure out before hand how to access this line.
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Old 06-20-2015, 10:01 PM   #2
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I'm not sure how that line is routed. Do you see a visible leak somewhere that you suspect that line?
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Old 06-20-2015, 10:08 PM   #3
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I've isolated the leak to behind the wet/tank bays and only when the water heater is turned on.
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Old 06-21-2015, 09:35 AM   #4
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It is weird that you only get a leak only when a faucet flows hot water, I say this because there is water pressure in all the lines to the heater, to the manifold and to each faucet, all the time and if there is a leak, one would think that it would leak all the time. Unless the leak is temperature sensitive, which is generally not the case.

I had a crazy situation that drove me nuts and not to say it is your problem, My bathroom sink faucet would leak underneath only when turned on. I found that when I took the aerator off to clean it, I did not put it back properly. When the faucet was turned on, water squirted out into the plastic water spout and back to where the faucet was mounted and down into the cabinet. LOL - my bad!
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Old 06-21-2015, 11:02 AM   #5
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By process of elimination, I had discovered (surprisingly) that the leak only seems to rear its ugly head when the water heater switch is ON. I had noticed a drip line when the unit was parked facing downhill (obviously water won't flow uphill), behind the tank/wet bays but only after systematically going thru a few situations.
1) Water pressure (with pump switch ON), no leak.
2) Water pump ON with outside shower cold or hot ON, running separately (with water heater OFF), no leak.
3) Water pump ON with outside shower hot (with water heater ON), leak formed. Note that I'm having a further complicating problem of the Atwood Water heater not lighting most of the time and it wasn't lighting during this testing either and no apparent leak within the actual Atwood unit)

No other faucet fixtures were turned on during this test.

I am assuming the water line runs from a manifold situated behind the conglomerate of plumbing in the wet bay, under the floor of the bedroom (carpeted) slides (both bed and wardrobe) BUT above the basement ceiling, since I can't see an exposed line in the basement. I guess it's possible it runs thru the transmission/engine bay but I find that improbable.

It has me concerned further because I now note the leak seems to be an old one because of the rust I discovered around the top and bottom of the tank bay. And this unit is brand new, just purchased in May and built a few months ago.
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Old 06-21-2015, 11:56 AM   #6
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Sorry to hear of your problems. That's a tough one.

I have a 2013 390RB with the rear floor area elevated for the bath room. In the process of running HDMI cable I discovered that the rear sinks and toilet drain lines run through a chase that goes along the street side of the bedroom. I believe I also recall seeing PEX water lines in there.

I know our layouts are different but you may want to check there.

Also I believe there are PEX lines in the rear most lower compartment that enter into the compartment and the hot water heater sits above it.

Sorry I can't be of more help.
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Old 06-21-2015, 12:01 PM   #7
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If I'm following your diagnostics, it seems that turning off the outside shower hot valve on the water manifold should stop the leak.
Right?


I normally keep that one turned off anyway as I seldom use the outside shower and never the hot outside.
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Old 06-21-2015, 12:04 PM   #8
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Just went out to the barn and checked. I was wrong about the lines running through the curb side lower compartments. But I was correct about them passing through the chase on either side and below the bed.
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Old 06-21-2015, 12:28 PM   #9
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The chases are not permanently attached to the floors or walls so they can easily be removed to check for any leaks there.
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Old 06-21-2015, 12:35 PM   #10
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Quote:
Originally Posted by boxers-rule View Post
3) Water pump ON with outside shower hot (with water heater ON), leak formed. Note that I'm having a further complicating problem of the Atwood Water heater not lighting most of the time and it wasn't lighting during this testing either and no apparent leak within the actual Atwood unit)

It has me concerned further because I now note the leak seems to be an old one because of the rust I discovered around the top and bottom of the tank bay. And this unit is brand new, just purchased in May and built a few months ago.
There is only one line from your water heater to the manifold and not a separate line for the outside shower. That is why they call it a manifold. As you stated, with the outside shower hot off; no problem. Not sure which off valve you are talking about; the manifold valve or the shower faucet valve. Either way, the problem is with either the manifold valve, the line from the manifold valve to the shower valves or the shower valve. Therefore your problem is right there in the wet bay. Leaks can be sneaky, you may not see where it starts, but water travels downhill and you see it where it comes out (which gives you often a false impression as to where the leak is).
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