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my understanding of the Navien with internal recirc pump is that they work with either an external dedicated return pipe or an internal bypass loop located within the water heater cabinet. Then replace the heater cover and turn the gas or power back on. Connect a regular garden hose to the hot side service valve. If we dont use it, we waste a lot of water. Parts that will actually be used depend on what kind of hot water recirculation pump you have. Pump the white vinegar into the cold side, up through your water heater, and out the hot side. Hello Frank, one of the disadvantages of recirculating pumps is that you have to wait for cold water a bit. There are two options when it comes to tankless heaters and recirculation pumps: If you have difficulty finding out which brand is the best for a tankless water heater with a recirculation pump, you should check the newest Navien, Rinnai, and Rheem units. I got a Navien NPE 240A2 installed in my home with dedicated recirculating line (hopefully I got the lingo right!) The recirculation pump is fixed on the water heater. On the other hand, if you find no foreign stuff, ensure you purge the air out of the system. Navien NPE-240s with external recirculating pump. We can go from there with up to 3 hours of dedicated live coaching on the telephone if needed. I have an NR240A for about 10 years now. The function of a recirculating pump is to ensure that hot water is always available as close to the consumption point as possible, in order to reduce water waste and to increase comfort. I can figure out occupied or not from a home automation or alarm system. Navien ComfortFlow is the first and only system that incorporates a built-in insulated buffer tank and recirculation pump. Therefore, when it malfunctions, it is a sign that the heater has another major underlying issue. For example, an open or shorted sensor causes this issue. The cost of a separate recirculation pump would fall in the range of $200 and $500, depending on the size required. We have a standard gas hot water heater with a circulating pump. When I hooked hoses to the service pipes, the system still produced a strong, steady flow of water, seeming to not drain. Dont hesitate to switch the tees around if you get them backward. Depending on the size of the pump and installation difficulty, the average cost of a hot water recirculation pump costs anywhere from $200 to $800 (installed). How can this new ban on drag possibly be considered constitutional? So, ensure you purge the air out of the recirculation pump to operate the unit quietly. Actually the only real issue is the lack of isolation valve on the recirculation connection, resulting in the constant water supply to the water heater. Also, check the filters to see if they are clean. I noticed my apartment building installed one and at that time the whole water pressure was low. Watt recirculating pump installed on the water heater (pump plugged into standard 110/120V outlet, 3/4-inch pipe thread connectors, valve). You mentioned that in the summer months your can turn off the recirculation pump. Go along the steps described below to set the recirculation settings. This serves two functions: You save water. Using a corrosion-free flow sensor made of stainless steel is a better option. These on-demand units need an even longer time for the hot water to reach a faucet because the heater has to first heat the water and then send it along to the faucet. Where does this (supposedly) Gibson quote come from? I bought the. link to Why Does My RV Carbon Monoxide Detector Keep Going Off? Open the pressure relief valve. You need to run white vinegar through the system, to descale the water heater. To remedy this, you can take the two clamps off the sensor, pull it out and clean it. The water heater will retain your settings during a power outage. Also, turn off the water heater, and recirculate the pump. It means that there is an issue with the air pressure sensor. Next, hook hoses to the valves, then open them to drain the water. The number of bathrooms, tubs, dishwashers, and washers. Let's hop in! What am I doing wrong here in the PlotLegends specification? Below are different Navien water heater error codes and their solutions; Navien error code 003 how to fix indicates that there is an ignition failure in your unit. Allow the vinegar to circulate through the heater for a minimum of one hour (longer if the pump runs at less than four gallons per minute). However, whenever I turn on the cold water at the kitchen sink for a few seconds the tankless unit starts to run (heat water) even though I dont want heated water. It tells you about the improper operation of the flow sensor. That may present a problem in the summer when you need cold water; turning the pump off during the summer months solves the problem. The circulation return needs to come from a loop at an end of the hot supply line. However, the hot water had to travel from your water heater to the faucet for you to use. It only takes a minute to sign up. Depending on the age of your Navien NPE-A model, he did you a favor. Generally, your Navien recirculation pump will produce a humming noise because of the wrong size primary loop, not purging the recirculation pump, or foreign materials getting into the pump. On top of that, the recirculating pumps also return the cold water in the pipes back to the heater. If this does not work, hire a professional to repair or replace any damaged parts. To understand this problem what I am talking about, you can watch this video: First off, I recommend you check the primary loop. ($0.05 $0.22/h), How Much Does 1000 Watts Cost Per Hour? I guess the recirculation line will be the only one that is copper. Eventually, they pay for themselves by reducing the water bills. Press question mark to learn the rest of the keyboard shortcuts. Just locate the air bleeder valve on top of the recirculation system. if you do have an external recirc line BUT it was installed when the Navien , then see if you can find where the recirc line connects to the hot water line - maybe it's serving a portion of your fixtures and the other fixtures are not benefiting from the recirculation. Turn off the device for half an hour and confirm everything is working correctly. Press the reset button to reset your device. When the heat exchanger starts to crack, it creates a gap that can escape toxic exhaust gasses. However, some gas needs to be used to heat water for the pump to circulate; the gas usage for this is pretty much insignificant relative to how much gas we use when powering the instant hot water heater. What kind of range do you get from the remotes? It means there is some issue with the flow sensor or switch. Examine the thermistors condition and pump wiring connectors. where does the recirc line tie come off the hot lines? After using this amount of time, hardware gets old and starts to malfunction. A place for plumbing advice and help. Overusing your recirculating pump also increases your electricity bill. Turns out that it was the temperature of the return water was high enough to stop the recirculation. It's unfortunate he's not around to explain all this to you. Calculator + Chart (Natural Gas), Average Gas Bill For 1-Bedroom Apartment: State-By-State Cost Analysis, Average Electricity Bill For 4 Person Household (Survey Analysis), How Many kWh Per Day Is Normal? Make sure to follow the instructions before and after you turn off the pump. some homes require multiple recirc lines in order for all fixture group to benefit. It worked perfectly. I agree the user manuals are very helpful. Save my name, email, and website in this browser for the next time I comment. $44.90. So you'll find the same info whether you're looking for the Navien 240A manual, the Navien NPE-240S manual, Navien NPE-180A manual or similar. NEC 310.16 Table: Copper And Aluminum Wire Ampacity Chart, NEC 310.12 Table: Wire Sizes For 100-400 Amp Services (83% Rule), kWh To Therms Calculator + Conversion Chart (1 kWh = 0.03412 Therms), MMBTU To Therms Calculator + Chart (1 MMBTU = 10 Therms), Therms To MMBTU Calculator + Chart (1 Therm = 1/10 MMBTU), AWG To Circular Mils Chart (For 4/0 AWG To 20 AWG). We hope we were able to help you out with our guide. Here are the leading causes of strange noises coming from your heater; Hire a professional or installer to repair your heater to avoid damaging the heater and voiding your warranty. Locate the reset button on the heaters front control panel. When building a house, its smart to think about hot water recirculation as well. When the water is sufficiently hot, the temperature sensor will shut off the power to the recirculation pump to conserve energy. The remote control module sits beside this area (I have it floating but I'll put double stick tape and mount it to the interior soon) and the antenna lead drops through a grommet (conveniently already available at the bottom of the unit near the pcb) to the outside. The air will need to be bled out of the system. There is a circulator pump, but it still takes a long time for hot water to reach the upstairs bathrooms. The filter is located at the top left of the water heater. However, I have envious of those who have the NPE with the hot button and wifi link. 2. It is caused by an open or shorted air pressure sensor. This serves two functions: This is also true for tankless water heaters. If you've got a tankless water heater installed that doesn't come with a built-in recirculation pump, then in such a scenario, a separate recirculation pump can do the trick for you. Continue with Recommended Cookies. We do all the time-consuming research and testing for you. If you are looking for a tankless water heater that can provide you with hot water 24/7, Navien water heater is the way to go. Navien tankless whole house HWH. First, open and close the pressure relief valve, which is located near the units outlet. A hot water recirculation pump can be sized for a given system using the following formulas: Water flow qc = /T x 4200 It usually occurs due to an open or shorted sensor. https://www.ebay.com/itm/12V-DC-MOMONTROL-RM11-/350575987090?hash=item519ff50992, Navien NPE-240A2 External circulation question, Navien NPE-240A and HotButton - DIP switches and parameters, Flushing Navien 240A set up for external bypass, Navien NPE External Recirculation Confusion. If enabled you would find that your hot water is ready to go almost anytime you need it, without a long wait. Its clearly not always running as I can see it says standby on the display most of the time. We trusted him and thought everything was just fine as we were getting hot water throughout the house. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Confirm the thermistor and wiring is in good condition. You can adjust the temperature by the below 10-degree increments, depending on the temperature range: 98 F-120 F/ 36 C-50 C 1 F or 0.5 C increments, 120 F-140 F /50 C-60 C Press for 2 seconds to adjust in 5 F or 2C increments. I have the newest version pcb since I just bought the tankless.