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I'm so sorry to read about Terry's passing. I've visited here off and on since 2008, having benefited greatly from his shared experience and knowledge.

The check valve "Grasping", are you serious? Bleeding air is the most basic of concepts. Closed hydraulic systems need bleeding, for obvious reasons. An open system (faucet) in many cases does not need to be bled, only needs it if there is a way to trap air in an elevated location where it...

Open the hot faucet, air is lighter than water. Water flow blows it out. There's your bleeder. You've never seen this? Needing a bleeder means the plumbing was done in a way that traps air. It's usually avoidable, but not always.

It's also pretty basic to place the pump near the high point in the system so it self-bleeds. Problem solved. Can't happen in every case, but is completely practical for many.

Sound is conducted as well, depending on the structure it is mounted to it can act like a drum, resonating with normal water heater sounds. Bolted to studs with stucco on the outside is likely worsening the issue. There is a lot on the internet about soundproofing walls, search "green glue" to...

Hmmm, maybe Navien doesn't use a self-priming pump and this is specific to Navien? Specifics matter, if you say they need bleeding I believe you. With the O-ring failures and bleeding requirement, it would appear they could have done better. Taco pump doesn't need bleeding. No doubt it's 50X...

Isn't the recirc line subject to water pressure on the inlet side, and as such not require bleeding? I'll defer to the experts, but my external recirc has been drained several times when plumbing service was required elsewhere in the house. It spits some air out the hot water side of the...

Sure am glad I didn't get the recirc model, Navien appears to have cheaped out on some important internal parts. My external recirc is on 12 years without failure. Cheap to replace or not, the PITA factor of tearing into the water heater is so not worth it.

My S2 is aware there is external circulation through a configuration menu, as well as type of circulator: always-on, intelligent, etc. This allows it to survive in a hostile recirculator environment, although it's preferred to set up external recirc correctly with an aquastat. I think they...

You can't see the stainless pump body in the photo? The venting is a quick install to get hot showers while I wait for the roofer to come out and replace the roof jack to fit the PVC concentric vent. What a bunch of critics :rolleyes:

I see I didn't post photos of my finished Navien NPE-240S2 installation, her are some belated pics. Old Noritz NRC1111-DVNG: And here is the new Navien S2 with dedicated external recirc controlled by home automation. Note the 12-year-old Taco pump and bronze, external check valve are still...

Bought a Navien NPE-240S2. Mounting and venting now, plumber will come tomorrow to sweat the copper and move the gas pipe an inch or two.

You're making assumptions about my recirculation setup. It is controlled by home automation and an aquastat. It works perfectly, only running when needed.

Unfortunate about support not talking to homeowners, Noritz was good about that. I have a recirculation pump and check valve installed external to the water heater, so would want the NPE-240S2 model without recirc.

The heater only saw softened water with the chloramine removed by a backwashing catalytic carbon filter, and was flushed with vinegar every year. It wasn't negligent maintenance, it was a Noritz problem.

I have a Noritz NRC1111-DVNG installed in the attic when I re-piped the house in 2012. 10 months ago the lower copper heat exchanger started leaking, so I hired a local tankless specialist to replace it along with the gas manifold and some associated parts provided under warranty by Noritz...

https://readytemp.com/

Improving the water hammer issue allowed me to up the pressure a few psi, which seems to be enough that I don't hate it so much. 500XL ain't no $80 dollar pressure regulator, either.

Again, there was no guessing involved on my end. I measured the pressure into the regulator static and under flow, posted above. The pressure drop under flow is solely caused by the regulator, and Zurn cops to this when they state "12-17psi of fall off is normal", as well as when they describe...

Arrester opposed to the valve: Arrester opposed to the long pipe: