Navien Internal Recirculation, Recirculation pump was not providing faster hot water to my bathrooms and kitchen. ComfortFlo Exclusive built-in recirculation system included on all NPE-A models -in insulated buffer tank and recirculation pump. Navien’s NPE-240A2 condensing tankless water heater for commercial & residential applications uses high-efficiency technology to provide endless hot water. Starting Recirculation During the recirculation, when NPN Non-condensing water heaters are connected, The preheating icon ashes continuously. Can you Apr 12, 2022 · Don't have any idea on Navien recirculation settings? Then, read this article to learn what the recirculation setting is and how it works. Switch 1 is ON; all the others are off. Aug 30, 2025 · They CAN however void a warranty claim if what you did CAUSED the failure. Dec 26, 2021 · The Navien NPE-210A2 installer manual (under 'External Recirculation', (p 84) says: "A2-type models must be set to use an external pump". At the push of a button, the Navien HotButton activates the internal recirculation pump and gas fired burner to heat water in supply lines. The built-in recirculation pump allows the NPE-A2 tankless water heaters to recirculate water through an external recirc line or through existing supply lines while using NaviCirc ®, without the need for external pumps or controls. The recirculation pump saves on Navien Tankless Water Heater Internal vs External Recirculation Explained Recirculation systems often face inconsistent water temperature and increased energy use. I am confused about the internal v. Could less frequent recirculation help? Recirculation System NHW-A series tankless water heaters have 5 recirculation modes: Internal, Always On, Intelligent Preheat, Scheduled, and On-Demand with HotButton™ (optional accessory). Nov 15, 2024 · The Navien NPE-A series tankless water heater has a built in circulator that helps provide hot water faster for the end user, helps control the “cold water sandwich”, and will provide hot water at a lower flow rate than the standard unit. This article explains what internal recirculation is, how Navien systems implement it, how to determine model compatibility, installation considerations, operation options, and maintenance tips. I generally do not advocate retrofitting a tankless where a tank heater was, there is added costs and complexity. I just had a Navien NPE-240A2 installed, replacing a regular hot water heater that had an external re-circ pump that had died. As it stands, I do NOT have an external recirc pump with the Navien, I am relying on the internal pump that is built in to the unit. Internal recirculation uses the heater’s built-in pump to maintain hot water inside the unit, preventing freezing and reducing wait times. It turns out that my dip-switch settings were not in the proper order. There are two different modes in the recirculation features of the NPE series, what we call either internal recirculation or external recirculation. This may eliminate the waiting for hot water depending on installation method. com Dec 20, 2025 · This article explains how internal recirculation works, how Navien implements it, potential benefits, common issues, and practical maintenance tips. Is this right? The A2 models have an internal pump, I'm set up to use external recirculation with a hot button, and it does seem to be working, so what Apr 11, 2022 · Turning internal recirculation on (and adjusting the setting and turning the bypass lever) will mean that as soon as you open a tap, fully hot water will flow out of your water heater from the buffer tank, because the mini tank will be kept on standby hot. Heater is in crawl space SE corner of house; master shower is 2 floors up in NW corner. Example: We did a navien water heater with an internal recirculation kit and they allow you to use it for 1 heating coil in their air This is how to set up Navien Tankless water heater for recirculation in Residential applications. See full list on lildutchuncle. Navien's NPE-A2 condensing tankless water heaters include a patented built-in buffer tank, recirculating pump & fine-tuned controls for comfort & convenience. 15. Jan 15, 2020 · I have had The Navien NPE240A for about two years now and the unit has worked flawlessly, but it has taken me a while to get my recirculation settings working and recirculation parameters dialed in. when NPE-A2/S2 condensing water heaters are connected, The preheating icon keeps turning on. This unit is equipped with high quality stainless steel heat exchangers for extreme corrosion and thermal stress resistance, giving your tankless a longer lifespan. The internal recirculating pump continuously keeps running. Readers will find actionable guidance for optimizing performance, troubleshooting, and ensuring system longevity while optimizing energy efficiency. This gives your customers hot water when they need it, saving water and money. The buffer tank eliminates the “cold water sandwich” effect and issues of minimum flow rat s commonly found in other tankless water heaters. Perhaps this is normal--how does recirculation help if the heater is not firing--seems like this would just be sending ever cooler water around the loop. If recirc. Example: We did a navien water heater with an internal recirculation kit and they allow you to use it for 1 heating coil in their air Built for Performance – Our NRCR PRO Recirculating Tankless The Noritz NRCR series offers the latest cutting edge recirculation technology in a tankless water heater. I, recently had a Navien NPE-240A unit installed. . It takes 3 minutes to Find brochures, manuals, guides, labels, specs, drawings, revits & certificates for Navien water heater. This system continually cycles a small volume of water through the plumbing lines back to the heater, maintaining a warm temperature within the pipes. 14. external settings and a few other things. But the scaling issue is water specific, your results may vary. I really only use the navien 240a2 (with internal recirculation) Love it, never scales, no sandwich, well worth the few bucks over the non recirculating model. is off, then there is a delay. Nov 15, 2024 · How intelligent recirculation works in Navien tankless water heaters, including your setup and control options, automated cycles and available accessories. Nov 25, 2025 · The recirculation system within a Navien tankless water heater is a built-in feature, typically comprising a pump and a bypass valve. Valve is set to Internal. Mar 5, 2022 · 240A checks the water temperature in the external recirculation line every M minutes, where M is the value in P. The Circulation Pump will activate if the water temperature in the external recirculation line is equal to or less than D degrees below the desired water temperature (Front Panel display temperature), where D is the value in P. Nov 3, 2019 · Newbie to on-demand condensing water heaters just bought a newly-constructed house containing a Navien NPE 210/240 A. Advanced water heating, HVAC & water treatment solutions built on intelligent technology for lasting performance in residential & commercial environments. w7zy, vlxps, tfvac, auzmrw, ts9etx, ehgbpo, maq0f, hnqjqr, wyjwq, bzai0,