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Old 09-12-2015, 08:56 PM   #11
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That actually looks like polyethylene tubing which is only rated for 140deg F. And that configuration looks like it's probably pretty close to the heater itself.
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Old 09-12-2015, 09:02 PM   #12
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Looks like someone used flex tubing instead of Pex.
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Old 09-12-2015, 09:44 PM   #13
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AVid, the pressure relief valve never went off.

Flybob/Bama, I'm thinking the same thing...they used poly tubing instead of PEX. And you are right, the piece that failed is right out of the heater so the water is at it's hottest right there.

Here is a pic of the repaired piece. I ran Red PEX as far as I could easily get to for now. We will see what FR comes up with when I talk with them on Monday.

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Old 09-12-2015, 09:50 PM   #14
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Quote:
Originally Posted by iceblaze580 View Post
Maybe it was just a bad piece the used

That was my first thought until it got the piece out and saw it looked like flex tubing and not PEX. Now I'm leaning towards they grabbed the wrong tubing on the assembly line!




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Old 09-12-2015, 10:11 PM   #15
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Update: I was able to get to a piece of the tubing with writing on it. While it is not Shark Bite PEX, it is tubing that is rated to the same specs as Shark Bite PEX and it is rated for hot water.

Here is an excerpt from the specs:

"SafePEX tubing is SDR-9 plumbing tubing that meets ASTM F 876, ASTM F 877 and CSA B137.5 specifications. Pressure rating: 160psi 73.4 deg F, 100psi 180 deg F, 80psi at 200 deg F. SafePEX tubing is produced by the peroxide (Engel) method. This method performs “hot” cross-linking, above the crystal melting temperature. It provides more consistent and uniform cross-linking than the other two methods."

I have a regulator on the city water supply hose that is set to 55psi. I find it hard to believe that I exceeded the PSI rating.

The highest temps I have ever heard the Atwood heaters getting to is about 160 before thermostats and pressure regulators start kicking in...so I find it hard to believe I exceeded the temp ratings of the hose.

Maybe it was just a bad piece of hose that failed.

I'll be keeping a close eye on the temps from the Atwood just in case it is running away with itself.




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Old 09-13-2015, 11:33 PM   #16
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Quote:
Originally Posted by tkdavis View Post
That was my first thought until it got the piece out and saw it looked like flex tubing and not PEX. Now I'm leaning towards they grabbed the wrong tubing on the assembly line!




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If there is flex tubing on the entire hot side forest river will have fun pulling pipe
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