Zurn relief valves not approved for tankless

[Plumber05]

Contacted Zurn with question on relief valve model P1000AXL-150C which Navien directly calls out in manual as approved pressure relief valve and Zurn informed me that this model is not approved for tankless water heaters as valve relieves vertically and not horizontally. They even went further and said they do not make a relief valve approved for tankless water heater applications as shown in Navien manual and I should contact a different manufacturer as they could no longer help me.

 

[Jeff H Young]

ok try wilkins, cash acme or watts

 

[Sponsor]

 

[Breplum]

What Zurn is telling you sounds like official nonsense. Any "pressure relief valve" with a 150 PSI rating should be is fine.

 

[Fitter30]

Zurn P1000AXL-150C Is pressure only but looked at Navian theirs look like only pressure to. 2 nd page fine print.

https://www.pexuniverse.com/uploads/docs/pdf/zw-p1000axl-specs.pdf

 

[GReynolds929]

Any 150psi relief with the correct BTU/HR rating will work. If Zurn doesn't want the sales then I would buy a different one, but never had an issue with them on tankless. Not to mention there's lots of tank that have the pop off on the side and not the top.

 

[Jeff H Young]

Sounds like BS but Id have no problem not using thier product. who cares ? why insist on use of unapprooved stuff ?