Had a pex pipe burst this past season because of some pressure and high temp issues with the system. I made a temp repair to the pipe. All other items were fixed. I am going to make the perm repair now before the season starts. Have a gas boiler hot water baseboard two zone system. Repair will be on the 1st floor zone. I did not use oxygen barrier pipe for the repair. Couldn’t get it on short notice at the time. I will drain the zone and remove pipe and replace with new pipe. Just reaching out to the group to see if there is anything I need to watch out for or keep in mind. Anything procedurally to consider. The hardest part is that it is in a crawl space. It is just the one pipe about 15 feet long. Thanks all for reading and for any responses.

you made a temporary repair and now you are making a permanent repair with the correct material.
you are good to go...

My suggestion would be do not use push type fittings like shark bites

I would use actual pex fittings and crimp rings

I spoke with a rep from viega when I saw the plastic pex fittings for the first time and asked them if the plastic fittings where suitable for heat applications, I was told a crimp joint is a crimp joint no matter the material… 5 year warranty

I would still buy the brass fittings for the heat work especially because you wrote about past pressure and temperature issues

Thanks guys. I will be using the expansion type connectors. Both ends going to brass fittings. That is what I have and what is throughout the entire house for 15 years now. The high temp and pressure issue occurred in the boiler with a bad expansion tank and faulty aquastat. I was lucky the pex burst where it did. I have since replaced most parts of the boiler. Guess I was lucky could have been much worse. All else was working great at the end of last season.



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The boiler Pressure Relief Valve 'should' pop (open) well before a pipe burst due to pressure.

If the piping supplying hydronic heat(ing) fluid burst due to TEMPERATURE perhaps a system redesign is in order.


............... just saying ...................

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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

did you save the burst pipe?
i would contact the manufacturer to send them the piece. (if you still have it)
they will be very interested to see what the reason for the failure is.
if there was a manufacturing defect, they might pay for a complete repipe.



Edited 1 times.

Thanks again. I did replace the pressure relief valve as well. Also set temp of boiler lower to be safe 170 was at 180. I may still have the pipe. If so I will contact the manufacturer. I was a bit surprised that it burst as well. Thought pex could expand enough to prevent that.