I know this is an older post... but I just started to experience this "low frequency" revving sound from my Navien NPE-210. Read more >> Problem Solved: Gandy Installations Saves Customer Enough Space for a Refrigerator. It is a fact that tankless water heaters take a little more time to get hot water to the tap. This is usually caused by a valve that is not fully opened, either at the water heater or at a particular … The whistling makes me wonder if they didn;t seal the pipes. If you have any problems with your Navien heater, feel free to ask in the comment section! Thursday at 12:19 PM: Tankless Water Heater Forum: Flushing a Navien CH180: Monday at 2:57 PM But I am not sure if the differences in delay should not be as sharp as in the article. When venting Navien NPE tankless water heaters, it is important that you do not start the vent run with a street elbow at the vent collar. The unit probley was not maintained since it was installed. For this error, you need to turn off the water heater for at least 30 minutes and then restart your water heater. It runs with electricity, so you need to be careful all the time to avoid terrible electric shock. For a home, condo, apartment, or office the Navien combo boilers are a great way to enhance a hydronic heating system with the added benefit of on-demand hot tap water as well. Westinghouse is a famous water heating products developer based in Massachusetts, USA. Nobody told me the unit should be descaled once a year. Generally, this happens because users have set the temperature too high. Besides, the filter could also be clogged by dust or unusual stuff from the water supply. Read more >> Problem Solved: Gandy Installations Saves Customer Enough Space for a Refrigerator. Humming water Heater Noises: Humming sounds from an electric water heater is most-often caused by turbulence in water inside the heater as water flows around its one or two electric heating elements. Low NOx Emissions (less than or equal to 20ppm) Navien issues. 7of them being navien heaters , the 240 A nat gas ones. Navien standard ultra condensing tankless technology with the industry’s top rated unit for energy efficiency. A tank water heater on the other hand starts sending hot water right away. the … When a hot water tap is opened, the tankless water heater detects the flow. A hot water recirculating pump is convenient and adds comfort, as it means getting hot water faster when you turn on the hot tap. Efficiency . Call the tech guys because your exhaust thermostat is wrong somewhere. Navien tankless water heaters have been in the US market for quite some time, I recently installed the latest model in my own home. 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-Standard. Cold water means lower volume since the temp says constant. It was the first brand to introduce consumer-grade water heaters in the market, and as such, it’s a company with a pretty good reputation it must protect. Here are 7 common causes on why water heaters make unwanted noise Get all the information you need to know on household problems and appliances with Think Tank Home. Navien NPE-210S Water Heater. Heating capacity values are based on U.S. Department of Energy (DOE) test procedures. During warmer periods, the whistling increases. For any other strange, unusual or potentially dangerous, you’d better shut water heater off, then call for help from the technical support. Various other problems could be causing this. The one feature that make this model stand among the rest is its impressive flow rate. Once you turn it off it sounds like a small engine revving from low to high and then back down to low. The noise is not dangerous to your water heater, but could lead to eventual wall damage if it is not corrected. Navien offers the industry’s most advanced condensing tankless water heaters, condensing boilers and the first combi-boilers strong enough to support whole house heating and hot water for larger homes. WARNING: Before reading further, keep in mind that the water inside a water heater is most commonly heated to 125° F and possibly up to 190° F if set to its highest setting.Any water temperature in this range can cause severe injuries and even first degree burns on even the lowest setting. Well, if you haven’t, then your error code might not be here (since we do not list out all the possible code) and you should call for tech support. The incoming water temp is an issue, and the colder your water, the harder the heater needs to work to deliver the agreed temp. I have had problems with the unit as the water turns cool after about 2 minutes in the shower. The Navien NPE-240A natural gas tankless water heater comes with a “Comfort Flow” technology that uses a built-in Internal insulated buffer tank and recirculation pump. Also check out for any limitation in water inlet and outlet flow, or water valves not fully open. If gas, the oxygen sensor that detects carbon dioxide has failed shutting off the burner prematurely. Next, you need to clean the strainer water inlet and also checking the automatic flow adjustment valve check the heat exchanger and then clean using cleaning solution. View & download of more than 367 Navien PDF user manuals, service manuals, operating guides. This is simple procedure which you can do yourself or have a plumber do for $185. This could affect your heater’s durability. Navien offers 3 series of condensing gas tankless water heaters: the NPE-A, the NPE-S, and the NR. There are problems with your heater’s fan and air pressure system. In case water took forever to warm up, you could see if you accidentally set the heater at low temperature or not. At the push of a button, the Navien HotButton hot water system activates the internal recirculation pump and gas fired burner to heat water in the supply lines to provide hot water whenever it’s needed. Each is designed for indoor or outdoor installation and residential or commercial use. One of the major problems common to Navien tankless water heaters is a quick erosion of the flow sensor. In this case, you’d better have a contractor come to check the heater for you! It lasts for about 10 to 20 seconds. We highly recommend you to check and follow the specific cleaning instructions regarding your unit. Recirculation mode same as for issue E012 navien water heater humming you should call for tech support capacity... It can also be a signal that something is wrong somewhere where this... Taking a … i have a new Navien NCB-240 in our new home about 6 ago. 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