Navien 240a dhw wait

Navien NPE-240A2. Navien premium efficiency advanced condensing tankless water heater with built-in recirculation pump and buffer tank. Annual Operating Cost: Navien Tankless: 179.0 therms CA$250*. 189 Liter Tank: 293 therms CA$409. *Based on Energy Guide cost estimates using CA$1 per therm of natural gas.

To obtain warranty repair service, the end user or homeower must contact the original installer of your Navien product. If the original installer cannot be identified, the end user or homeowner may contact Navien's Technical Administration Department at (800) 519-8794. Proof of purchase is required to obtain warranty service.The Navien replaced a 50 year old cast iron furnace with gas converter on the front. No issues with the Navien until the cold weather set in. So a few weeks ago when it hit -2f outside the house temp maxed out at 65f. ... not wait an hour or three for it to bump back up. ... Navien NCB-240 Combi Boiler - DHW is fine, NO HEAT. Handstied; Oct 5 ...This gives you hot water when you need it. The Navien recirculation system is cost effective and energy efficient. A Navien tankless water heater with a recirculation system can also deliver hot water based on your lifestyle and daily/weekly routine. Your Navien tankless water heater can be scheduled to preheat the water in your supply lines ...However, if the water heater is running constantly in a residential setting, you must call a professional or contact Navien Technical Support at 1-800-519-8794. 09. Navien Hot Water Heater Keeps Shutting Off. Several reasons cause your Navien water heater to keep shutting off, including: The electrical wiring gets damaged or shorted.Navien NPE-240A Water Heater. ½ gas pipe capable up to 24′. Field convertible gas system. Ultra condensing efficiency. Dual stainless steel heat exchangers. Low NOx emissions (20ppm) SCH 40, 2″ venting up to 60′. Cascading capable. NPE-Advanced.Hello, I have a NFC-200 & NPE-240A in cascade - all controlled by a Navilink. ... Do you have that much high GPM useage for DHW or what? Sponsor Paid Advertisement. 1 minute ago; Add bookmark ## ... Navicirc Woes on Navien 240A. hardfacer; Apr 7, 2024; Tankless Water Heater Forum; Replies 18 Views 430. Apr 11, 2024. hardfacer. H.Navien ComfortFlow® was the first system to incorporate a built-in insulated buffer tank and recirculation pump. The buffer tank eliminates the “cold water sandwich” effect and issues of minimum flow rates commonly found in other tankless water heaters. The recirculation pump saves on water bills by reducing the time to get hot water.Page 89 Payment for labor in completing the warranty service is subject to Navien's prior written approval and shall be subject to Navien's schedule of approved labor allowances. Page 90 MEMO... Page 91 MEMO... Page 92 Installation and Operation Manual Navien, Inc. 20 Goodyear lrvine, CA 92618 TEL 1-800-519-8794 FAX 1-949-420-0430 www ...

Ultra high-efficiency tankless water heaters—also known as condensing tankless—use two heat exchangers to supply endless hot water when you turn on a faucet. They use less energy (and money) than traditional water heaters because they don't need to reheat the water over and over. When a hot water tap is opened, the tankless water heater ...Having one anyways wouldn't be a bad thing, though. Especially if your water meter has a check valve built into it, like how I believe most of the newer ones are. By the way, I downloaded and skimmed through the install manual for your unit and it doesn't specifically mention that an expansion tank is required, but one is shown in the piping ...Apr 28, 2022. #1. I have a Navien NCB 240E combi-boiler set up for hydro space heating and domestic hot water (installed 2019) I am having an ongoing issue and can't figure it out. My domestic hot water side is set to around 125 F. When I turn on a faucet to call for hot water, the flow rate is 0.6 GPM. The boiler will heat up to 125-130 F temp ...Find brochures, manuals, guides, labels, specs, drawings, revits & certificates for Navien NPE-240S condensing tankless water heaters.The only way to increase the gpm output of the Navien is to decrease temp rise. gpm = btu/hr divided by (Temp Rise x 500) 5.7gpm = 199,000/ (70 x 500) 4.4gpm. = 199,000/ (90 x 500) Used 50 degree incoming water temp, your climate worse case maybe different. Temp rise is the difference between the incoming cold water temp and the setpoint.15:1 DHW and up to 10:1 heating TDR Field convertible gas system (NG/LP) up to 10,100 ft. Capable of cascading up to 15 NPE water heaters ... When a DHW (hot water) demand happens in a Navien combi boiler, the unit switches from space heating mode over to DHW mode. Referred to as DHW Priority, the unit will utilize the full capacity to heat the ...View and Download Navien NPE-180A2 installation manual online. Condensing Water Heaters. ... Water Heater Navien NPE-240A Installation Manual. Condensing water heater (68 pages) ... External DHW external DHW Setting range: Tank Setting tank combustion. Enable, Disable Setting range: Default: 4.Navien Tankless Water Heaters. NPE-A Series 199,900 BTU Condensing Tankless Water Heater. Brand: Navien. SKU: NPE-240A. Rating: (0) Q&A: (1) Hover image to zoom. NPE-240A has been discontinued. Discontinued December 14, 2020. This product has been discontinued. MANUALS (5) Brochure. Submittal Sheet. ... Est. wait: 1 min.

Navien's water heaters, boilers, hydro-furnaces & water treatment solutions provide innovative high-efficiency technology for residential & commercial projects. ... DHW Capacity. Model: NPE-240A2: Natural gas: 13,300 - 199,900 BTU/h: Propane: 13,300 - 199,900 BTU/h: Operating Cost. Navien Tankless: 179.0 therms. $250* Other Tankless: 228 therms.With a Navien Tankless Hot Water Heater, such as the Navien 240 there is no limit on your hot water. Incredibly efficient, they are designed to heat water in seconds, and only when it is needed. The Navien 240 and Navien 240A can be 20% more energy efficient than a conventional water heater, leading to monthly savings on your energy bill.Medtronic (MDT) shares are pointing up, but investors should wait for more strength to buy the stock, writes technical analyst Bruce Kamich, who says the technical indicators are m...To obtain warranty repair service, the end user or homeower must contact the original installer of your Navien product. If the original installer cannot be identified, the end user or homeowner may contact Navien's Technical Administration Department at (800) 519-8794. Proof of purchase is required to obtain warranty service.

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Find brochures, manuals, guides, labels, specs, drawings, revits & certificates for Navien NPE-240A condensing tankless water heaters.We would like to show you a description here but the site won’t allow us.This problem typically starts with an ERROR 001, ERROR 038, or ERROR 039, but your Navien could show a number of other errors caused by the faulty flow sensor. We will discuss further below. First thing, if you need hot water immediately, try unplugging the system wait 30 seconds, plug it back in. This resets your tankless and may give you hot ...I have a Navien CR 180 continuous flow water heater, and it heats the water just fine for a couple of minutes and then it just shuts off, a rest (power off then back on) brings back the hot water but …I have a Navien NPE-240A in a closet, which also contains our home networking equipment. It is about 3 years old in a new construction house. Lately, it had been tripping our AFCI circuit breaker, which I learned are prone to nuisance tripping. Each time the circuit breaker was reset, the Navien...A former Navien fan-boy he has installed hundreds of Naviens, but has pretty much given up on trying to get them to fix this. MANY water tube heat exchanger type Naviens leak exhaust internally at the gasket at the top of the heat exchanger, which if bad enough or long enough degrades the control board and plastic parts inside the cabinet.

Nov 15, 2023. #2. Both models are equipped identically, but the NPE-210A2 has a gas input capacity of 12,000 - 180,000 BTU whereas the NPE-240A2 gas input is 13,300 - 199,900 BTU. This translates to the 240A2 supporting slightly higher gallons per minute compared to the 210A2 while supplying consistant water temperature.Navien Inc. 20 Goodyear, Irvine, CA 92618 800‑519‑8794, Navien.com THE LEADER IN CONDENSING TECHNOLOGY Item Model NPE‑150S NPE‑180A NPE‑180S NPE‑210A NPE‑210S NPE‑240A NPE‑240S Heat capacity (input) Natural gas 18,000– 120,000 BTU/H 15,000–150,000 BTU/H 19,900–180,000 BTU/H 19,900–199,900 BTU/H Propane …Navien Inc. (Headquarters) 20 Goodyear Irvine, California 92618 Phone: 800-519-8794, 949-420-0430 Navien America Inc. (Branch Office) 325 Route 70 East Cherry Hill, New Jersey 08034 Phone: 800-519-8794 Fax: 856-354-5099 Navien America Inc. (Branch Office) 346 Millway Ave. Unit 7 Vaughan, ON L4K 3W1 Phone: 800-519-8794 Fax: 905-532-9976high efficiency Condensing Combi-Boiler. Smart controls LCD display, quick dial wheel & Setup Wizard. Advanced stainless steel dual heat exchangers. 15:1 DHW and up to 10:1 heating TDR. Field convertible gas system (NG/LP) up to 10,100 ft. Capable of cascading up to 15 NPE water heaters. Capable of common venting up to 7 NPE water heaters.If countries don't adopt a standardized digital way of checking health documents, IATA warns travelers could wait up to eight hours at airports as vaccinations and tests are verifi...Lowest price guaranteed on Navien NCB-240/130H 199,900 BTU DHW 130,000 BTU HTG Condensing Combi-Boiler. We offer fast, free shipping with every purchase. Convenient payment methods and stress-free financing options are available.Some of the combi boilers run short cycles to keep the DHW heat exchanger hot all the time. This reduces the hot water wait time. The burner would light off however if it is trying to maintain the HX A few of the Lochinvar combis allow you to choose between cold start and always hot. Maybe look for that setting and toggle it off, if it is enabled.H2Air Installation Manual. Product Downloads > H2Air Installation Manual. Download file. Email file. Copy link. Home. Close. Navien's water heaters, boilers, hydro-furnaces & water treatment solutions provide innovative high-efficiency technology for residential & commercial projects.a global leader in high efficiency water heaters and boilers. Whether you need an endless supply of hot water, efficient home heating or both, Navien has the perfect energy efficient solutions. Navien offers the industry’s most advanced condensing tankless water heaters, condensing boilers and the first combi-boilers strong enough to support ...NPE-180A2 premium features and benefits. 2" PVC venting up to 75 feet. Low exhaust gas temperatures allow use of PVC (including schedule 40 PVC), CPVC, polypropylene (rigid and flexible) and stainless steel venting saving time and costs. Vent Installation Detector (VID) for added safety. Dual Venturi for field gas conversions.There are many factors that can affect the lifespan of a boiler, such as how well the unit is maintained, the water quality passing through the unit, and how well the system is designed to work with the boiler. Most Navien boilers have a 10-15 year residential warranty (depending on the unit).

navien tankless water heater 240a Results for 'navien tankless water heater 240a' 1 Products Grid View List View ... Navien Outdoor Vent Cap for Navien NPE-210A and Navien NPE-240 A Tankless Water Heaters. Quick View Part #N30010604A Item #4471233 Mfr. Part #30010604A 3.1 out of 5 Customer Rating. Info Requires Certification. Points Call ...

Page 89 Payment for labor in completing the warranty service is subject to Navien’s prior written approval and shall be subject to Navien’s schedule of approved labor allowances. Page 90 MEMO... Page 91 MEMO... Page 92 Installation and Operation Manual Navien, Inc. 20 Goodyear lrvine, CA 92618 TEL 1-800-519-8794 FAX 1-949-420-0430 www ...Get genuine Navien factory OEM repair parts for your NR-240A-NG tankless water heater. All Navien parts are brand new in the original factory packaging. This is the NG model which means that it uses Natural Gas. We have fast FREE SHIPPING on all orders over $99 and ship all orders within 1 business day.This means (depending on hot water usage) significantly lower bills for energy usage when using a Navien condensing tankless water heater. Plus, Navien tankless water heaters reduce energy consumption, lower CO2 emissions, and condensing models have low exhaust temperatures which allow the use of less expensive PVC venting in most applications.Product Downloads > NPE-2 Installation and Operation Manual. Download file. Email file. Copy link. Home. Close. Navien's water heaters, boilers, hydro-furnaces & water treatment solutions provide innovative high-efficiency technology for residential & commercial projects.Find brochures, manuals, guides, labels, specs, drawings, revits & certificates for Navien NCB-240E condensing combi-boilers.3/4" NPT Main Supply. 120V AC, 60Hz. Power Supply. Maximum Power Consumption. 200W (up to 2 amperes), 350W (up to 4 amperes) with external pump connected. Casing. Cold Rolled Carbon Steel Materials Heat Exchangers. Primary Heat Exchanger: Stainless Steel Secondary Heat Exchanger: Stainless Steel. Exhaust.Navien 30012033B Dhw Flow Sensor. ... We were experiencing intermittent cold water from our 9 year old Navien NR–240A tankless hot water heater. ... I would have to wait for an extremely long time to get hot water. Sometimes I would start with hot water and then it would run cold. If I turned on the shower too, ...

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Navien's new innovative domestic hot water heat exchanger now generates even more hot water, giving customers the ability to run up to 3 showers and a ...I believe the static pressure on the heating side of Navien combi boilers needs to be at least 12 psi for it to fire up at all. When you pull the radiator either cap off valve isolate the missing radiator section and check that the pressurize the heating system side is still running 12 psi (30 max, but 15 psi is enough for most residential ...However, if the water heater is running constantly in a residential setting, you must call a professional or contact Navien Technical Support at 1-800-519-8794. 09. Navien Hot Water Heater Keeps Shutting Off. Several reasons cause your Navien water heater to keep shutting off, including: The electrical wiring gets damaged or shorted.Find brochures, manuals, guides, labels, specs, drawings, revits & certificates for Navien NPE-240A condensing tankless water heaters.The Navien NPE-240A2 has excellent technology for reducing your heating costs and carbon footprint. Product Features: 0.5″ gas pipe up to 24 feet and 2″ up to 75 feet. Natural gas or liquid propane (kit included) Indoor or Outdoor installs. Outdoor installs will need a vent cap. Stainless steel heat exchangers – dual.It provides plenty of hot water. The Navien NPE 240A has a flow rate of 2.4 gallons per minute, which is more than enough hot water for most households. I’ve never had a problem with running out of hot water, even when I’m running multiple showers or using the dishwasher at the same time. It’s easy to install.This Navien 240 supplies DHW to us via a 30-gallon holding tank and heats three zones on a Taco relay. All three zones have a Honeywell set-back wired thermostat. We had no heat this morning as the Navien displayed a low water pressure code. I noticed a small drip in a copper pipe connected to an air vent which must have caused the low …Navien water heaters prices, and installation costs. Water heater costs depend on the size and type of water heater you choose. The average Navien tankless water heater prices with installation cost are between $1,900 to $3,400 installed. You can also take advantage of special financing and rebate offers to reduce the cost of your new water ...Hello. New to the forum after searching for information on proper configuration for the Navien NPE-240A. I believe our installation was improper and have the plumber coming out (again) for diagnosis. Our issue is a lack of hot water in a reasonable time at the faucets despite having a NaviCirc-like (not Navicirc) line put in at the furthest faucet.Webapp Flight Wait takes the guesswork out of flight tracking by providing you with a map of FAA flight delays in real time. Simply input the city or airport code and let Flight Wa... ….

February 2023. Hey all! This is my first winter using a Navien Combi Boiler for in-floor radiant heading. I'm just wondering what temperature setting I should be using for Space Heat and if there are any other settings I should be using during the winter vs summer. At the moment, I have SH set at 130°F - the outdoor temperature is -15°C (5°F).How to check and change your Navien tankless water heater DIP switch settings and parameter settings. I wanted to get the most efficiency out of my Navien W...There is a common frequent issue with the NPE-240A internal check valve not closing completely. With the check valve remaining partially open, cold incoming water can flow backward through the circulation pump and 2-way valve, allowing cold water to mix with the heated water exiting the WH, resulting in low water temperature or temperature fluctuation to the home's hot faucets.Download the new Navien mobile app! Enter your serial number to see if this product has been registered. Navien's water heaters, boilers, hydro-furnaces & water treatment solutions provide innovative high-efficiency technology for residential & commercial projects.Navien NPE-2 Series, New NHW-A Series, & NPN Series high-efficiency tankless water heaters provide endless domestic hot water, all while keeping your utility bills low. A tankless water heater is a type of water heater that doesn’t use a storage tank to heat water. Instead, hot water is produced only when you need it.Navien has been pushing the boundaries of efficiency for 25 years. The NPE-240A2 is a result of their dedication to providing an effective and green water heating unit. The NPE-240A2 and all Navien models utilize condensing technology which captures additional heat lost by typical water heaters. The Navien NPE-240A’s energy factor is superior ...NPE-240A2 premium features and benefits. 2" PVC venting up to 75 feet. Low exhaust gas temperatures allow use of PVC (including schedule 40 PVC), CPVC, polypropylene (rigid and flexible) and stainless steel venting saving time and costs. Vent Installation Detector (VID) for added safety. Dual Venturi for field gas conversions.Navien Resale Policy - Consumer purchases through the internet or other e-commerce channels shall void Navien's warranty. >> Warranty Terms . Navien's water heaters, boilers, hydro-furnaces & water treatment solutions provide innovative high-efficiency technology for residential & commercial projects. Navien 240a dhw wait, “DHW Wait” on a Navien water heater refers to when the unit delays the delivery of Domestic Hot Water (DHW). This delay is intentional and is usually associated with certain operational aspects of the water heater. 2. How to reset a Navien tankless water heater? Resetting a Navien tankless water heater can vary slightly depending on the ..., NPE-A Plumb Easy 3 Valve Set. Part Number: (30022163A) Residential Neutralizer (V2) Part Number: (GXXX002212) Replacement Media. Part Number: (GXXX001323) PeakFlowS™ SCALE PREVENTION SYSTEM. Part Number: (GPWC110001AC001) Navien's water heaters, boilers, hydro-furnaces & water treatment solutions provide innovative high-efficiency technology ..., Hier sollte eine Beschreibung angezeigt werden, diese Seite lässt dies jedoch nicht zu., Get genuine Navien factory OEM repair parts for your NCB-240E-NG tankless water heater. All Navien parts are brand new in the original factory packaging and are guaranteed to fit and function properly. This is the NG model which means that it uses Natural Gas. We have fast FREE SHIPPING on all orders over $99 and ship all orders within 1 ..., February 2023. Hey all! This is my first winter using a Navien Combi Boiler for in-floor radiant heading. I'm just wondering what temperature setting I should be using for Space Heat and if there are any other settings I should be using during the winter vs summer. At the moment, I have SH set at 130°F - the outdoor temperature is -15°C (5°F)., Navien OEM Heat Exchanger Parts. Get genuine Navien factory OEM Heat Exchanger Parts for your Navien tankless water heater. All Navien Heat Exchanger Parts are brand new in the original factory packaging. We have fast FREE SHIPPING on all orders over $99 and ship all orders within 1 business day. Showing 1 - 12 of 45., We have 6 Navien NP-240A manuals available for free PDF download: Service Manual, Operation & Installation Manual, Installation Manual, Owner's Operation Manual, Quick Installation Manual . Navien NP-240A Service Manual (179 pages) NR/NP Series Tankless Gas Water Heater. Brand: Navien ..., The unit is setup for DHW to use the internal recirc pump and an external recirculation loop. Assume the unit is set to “Weekly”, and the current time is within the hours specified (e.g 6am to 10pm). The water temperature is set to 120 °F. The above listed parameters are set to their default values., Find brochures, manuals, guides, labels, specs, drawings, revits & certificates for Navien NPE-240A condensing tankless water heaters., Connect the water heater’s water supply. Go to the 2-way valve’s setting and set it to INT. It is right at the back of the unit. You just have to turn it to the left, as shown in the picture below. Go to the menu by pressing the M button on the control board. Select Recirculation Settings by pressing OK., Item DHW use only Navien's Condensing Tankless Gas Water Heater Hot-Water Flow Chart ... NR-240A / NR-240 NP-240A / NP-240 Min: 20,000 Btu/hr Max: 199,000 Btu/hr Item Model * Navien America reserves the right to change specifications at anytime without prior notice. Natural Gas, Navien Premium Efficiency condensing tankless water heaters are the #1 selling high efficiency condensing tankless water heaters in North America. The NPE-2 series offers ultra-high efficiency up to 0.96 UEF to keep your utility bills low, endless hot water, and exclusive ComfortFlow® technology with a built-in recirculation pump and buffer tank., Navien’s NPE-240A2 condensing tankless water heater for commercial & residential applications uses high-efficiency technology to provide endless hot ... DHW Capacity. Model: NPE-240A2: Natural gas: 13,300 - 199,900 BTU/h (3.897 - 58.571 ... What is the difference between Navien NPE-240A and NPE-240A2? NPE-240A is the original …, May 31, 2023 · This gives you hot water when you need it. The Navien recirculation system is cost effective and energy efficient. A Navien tankless water heater with a recirculation system can also deliver hot water based on your lifestyle and daily/weekly routine. Your Navien tankless water heater can be scheduled to preheat the water in your supply lines ..., New NFC-H highest heating and DHW performance ever built into one compact combi-boiler. Navien innovation, durability and proved fire tube technology has done it again. The new NFC-H has more heating and DHW capacities for today’s larger progressive homes. Navien continues to reinvent smarter ways to bring high efficiency home comfort to your ..., a global leader in high efficiency water heaters and boilers. Whether you need an endless supply of hot water, efficient home heating or both, Navien has the perfect energy efficient solutions. Navien offers the industry’s most advanced condensing tankless water heaters, condensing boilers and the first combi-boilers strong enough to support ..., Optional NPE-S2 recirculation valve. Designed for recirculation of domestic hot water in applications where a dedicated return line is not available. External pump neccessary not included. Part No. PFFW-001, NaviCirc Kit: 30022965A. External recirc pump and check valves not included., We also recommend that you report any maintenance at 800-519-8794, option 2 or option 3. If you purchased a Navien product from an online retailer, it may not be covered under Navien’s limited warranty even if it was installed by an authorized Navien installer. Please see our Limited Warranty for details. Navien's water heaters, boilers ..., a global leader in high efficiency water heaters and boilers. Whether you need an endless supply of hot water, efficient home heating or both, Navien has the perfect energy efficient solutions. Navien offers the industry’s …, Find brochures, manuals, guides, labels, specs, drawings, revits & certificates for Navien NPE-240A condensing tankless water heaters., 2. Remove the access panel on the front of the unit. 3. Locate the reset button (it will likely be red) and press it for three seconds. 4. Replace the access panel and turn back on the power at the breaker box. 5. Test your unit to see if it is now working properly. Navien tankless water heaters can be reset by pressing and holding the "reset ..., How often to clean Navien tankless water heater. When it comes to flushing your Navien tankless heater, you should do it at least once every year. But it's also a good idea to clean the filters in it before the start of each winter season. Conclusion. Hopefully, now you know how to reset Navien tankless water heater after completing this guide., Some of the combi boilers run short cycles to keep the DHW heat exchanger hot all the time. This reduces the hot water wait time. The burner would light off however if it is trying to maintain the HX A few of the Lochinvar combis allow you to choose between cold start and always hot. Maybe look for that setting and toggle it off, if it is enabled., Navien 30003725A DHW Outlet Pipe SKU: 30003725A; Genuine Navien Factory OEM Repair Part Read More; $11.95 / ea Inventory for this item is running low. Order Today! In Stock qty. Description This Navien 30003725A DHW Outlet Pipe is a genuine OEM repair part. It is brand new in the original Navien factory packaging and is guaranteed to fit and ..., Navien Announces First HVAC Product During Virtual Launch Event. Find an Installer. Call us: 1-800-519-8794. MEX/LATAM Spanish English (Canada) French (Canada) Find engineering manuals, guides, labels, specs, drawings, revits & certificates for Navien tankless water heaters, boilers, combi-boilers & more., 15:1 DHW and up to 8.5:1 heating TDR Field convertible gas system (NG/LP) up to 10,100 ft. Capable of cascading up to 15 NPE water heaters ... When a DHW (hot water) demand happens in a Navien combi boiler, the unit switches from space heating mode over to DHW mode. Referred to as DHW Priority, the unit will utilize the full capacity to heat ..., I have a navien 210- lp combi condensing unit water heater/ boiler installed in 2011 with no problems now I don't have hot water but the water heats for heat .burner works water is cold and shows no c …, We now have a NR-240A unit and we were excited to have problems behind us. However, we have had repeated issues with the heat level of our domestic water. Each time I call Navien for help, they suggest my issue is related to debris getting into the flow sensor and preventing it from triggering properly. The process to take apart the fitting ..., Setting Temperature on a Navien NCB-240 Thread starter djdavenport; Start date Oct 4, 2017; Users who are viewing this thread. Total: 1 (members: 0, guests: 1) djdavenport Member. Messages 56 Reaction score 6 Points 8 Location Santa Fe, NM. Oct 4, 2017 #1 ... Hey, wait a minute., Jun 29, 2018 · Having one anyways wouldn't be a bad thing, though. Especially if your water meter has a check valve built into it, like how I believe most of the newer ones are. By the way, I downloaded and skimmed through the install manual for your unit and it doesn't specifically mention that an expansion tank is required, but one is shown in the piping ..., Can I ask an add on question?? I just replaced an 11 year old NR-240A with a new NPE-240A2. Old unit had leaks in several areas and was more practical to replace. On the old unit - it had been set to circulate 24/7 and had been running constantly for 11 years with no issues till now. Hot water loop between floors is probably 200+ feet., Navien NPE-240A Installed December 2013 External re-circulation loop installed Scale filter installed at cold water inlet Repair history: March 2016: PC Board & Gas Valve failure. Both replaced. September 2020: Re-circulation pump stopped working. Determined to be due to air in the lines caused by recent installation of whole house water filter., I have the 240A. I've never timed the hot water, but its something I should do. I think you'll be happy with Navien. The installation would be a huge performance factor here, since the 240A has a return loop in the hot supply line. The distance from the heater to fixture will affect the wait time. Pipe insulation will be a factor as well.