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tankless water heater temperature reddit

Yes but usually you're required by code (at least in my state) to have a mixing valve to then bring to back down to 120 with the heater at 140 for legionella. Setting the temperature to 140 degrees F. will ensure the rapid death of any Legionella bacteria in the system. That's 180A. Rheem Manufacturing ranks as the global leader in the manufacture of high-quality, sustainable, and innovative water heaters, tankless water heaters, air conditioners, furnaces, pool heaters, and HVAC systems for residential and commercial applications, and is a full member of AHRI, the Air-Conditioning, Heating, & Refrigeration Institute. By using our Services or clicking I agree, you agree to our use of cookies. It did not eliminate the problem entirely but did make it a lot better. That is the first thing I've heard that makes sense. Call the installer, tell them you have a warranty callback, and they need to address or repair. Item #1084973. The only difference between the two is that the tank-type has storage and as such can afford a lower recovery rate, and the tankless has to be able to keep up with your houses demand and heat water as you need to use it. But someone said it earlier with “ hot water sandwich”. The electric instant heater should only kick in when the water is below a certain temperature and only use as much energy as necessary to increase the temperature by a certain amount, which would be reduced as the incoming water from the tankless unit gets increasingly warmer. You gotta remember in the winter the incoming water will be somewhere around 40F. Fluctuating water temperature from new tankless hot water heater Brand new Navien 240A installed a week ago. Tankless heaters work by heating the water on-demand as it flows through a heating element in the unit. "Low fire below 1 gpm and steady temp" sounds like what I'm looking for. Next day, same problem, water temperature drops noticeably for a few seconds, then gets hot again. Please think before Replying. To supply your hot water at 120F it will have to raise it 80F. Seems like normal operation to me. The problem is NOT a delay in getting hot water. That sounds like what’s happening here. I ended up showing my installer how to plumb the system and set up the recirculating feature ( I read the manual ). An average-size home (between 1,000 and 1,600 square feet) with two bathrooms will need a residential tankless water heater with a GPM of around 7.5. It might have to do with the flow sensor. If you set it that high, don't be stupider than setting it that high. If you believe that this might be the source of your problem, carefully inspect all of your shower heads, faucet aerators, and plumbing fixtures. Super High Efficiency Plus 8-GPM 160000-BTU Outdoor Natural Gas Tankless Water Heater. Super High Efficiency Plus 9-GPM 180000-BTU Indoor Natural Gas Tankless Water Heater. A tankless water heater saves space and offers greater energy efficiency than many conventional water heaters. There's no tank what are you talking about, New comments cannot be posted and votes cannot be cast, Note: 120F scalds in five minutes. These units have a warranty for a reason. 140F scalds in five seconds, Don't advertise or try to compare pricing, thanks, Press J to jump to the feed. February 13, 2017. When the water is flowing slowly, it spends more time in the element and heats up more. This particular tankless has a similar feature but it must be plumed correctly and the system must be set correctly for the recirculating feature to work. The temperature range of this unit is from 120°F to 140°F. I took the readings at a sink in the basement near the hot water heater, as it was easier than getting the readings from the shower upstairs. What tank? I am having a similar problem and I am curious how your issue was resolved. Old system had a recirculating pump with a grundfos valve placed at the furthest faucet. Best of all, this type of water heater never runs out of hot water, since there is no storage tank to deplete! You don't need to wait for a storage tank to fill up with enough hot water. Just something to think about if you want to do it one day. This is an issue that plagues tank water heaters since they must regularly maintain the temperature of the water they store. They're supposed to be set to 120. Lookup cold water sandwich. Or you could go another couple rounds of 'cold water sandwich' back and forth and get nowhere closer to a solution. After reading about a legionella outbreak in my town I'm wondering what temp my tankless should be set to. When a hot water tap is turned on, cold water travels through a pipe into the unit. Tankless water heaters are an energy-saving option for homeowners. I have it at 125 because of a long run in my house from the unit to the kitchen. Just to have some data to show the plumbing company that installed the unit, I recorded the water temp over 12 minutes or so using a digital thermometer hooked up to my computer, taking readings twice a second. There's no tank how can OP breed legionella. Good idea but I don't think it's the issue. for pricing and availability. The bigger the delta difference the slower your unit will supply the water. It's not sensing enough flow, and turning off burners or elements. Tankless units take about 15 seconds to bring water up to temperature, but you still have to wait for that hot water to arrive at your shower head or faucet, just as you do with a tank-type heater. I'll try it, but check the graph I posted. Many tankless water heaters are about the size of a carry-on suitcase and can be installed on virtually any wall inside or outside your home. The heater adjusts the heat output of the element to compensate for this, but it's not perfect. 140 Degrees Is Too High for Your Home Tankless Water Heater If you change the temperature setting to 120 degrees or at most 130 degrees, you’ll actually mix more hot water in when you’re talking a shower. You will end up using a little more gas but barely noticed in the bill. Tankless water heaters typically last up to 20 years, often twice as long as a typical tank-style unit. Usually, when you purchase your tankless water heater you will find that the manufacturer will already have set the thermostat at a temperature of 140 degrees Fahrenheit. Item #1084971. Press J to jump to the feed. Press question mark to learn the rest of the keyboard shortcuts. Some of them can be set to 140 (like mine). You're welcome. Brand new Navien 240A installed a week ago. Ah, ok. Factory set at 120 is just fine. Good lord, some of these replies are painful...but I guess that's what you get with free advice on the net. If all else fails, the heating element may be failing, and needs to be replaced. How far away from water heater. Sinks are a problem I guess. But the problem is that this repeats over and over and over, and never happened before getting the tankless. This happens periodically, like every couple of minutes. That is incredibly useful to know. I had issues with a normal hot water heater when it was new had to open the blow down drain hard filled and popped the pop off valve/ psv and never had a problem again. Random thought lol. Either a gas burner or an electric element heats the water. As a result, tankless water heaters deliver a constant supply of hot water. Yeah, something is up. This can make tankless water heaters more than 20% efficient, resulting in $100’s of savings annually. The Navien does have a “reserve tank” that tries to help mitigate the time until you get hot water. Most people only have 200 amp service. There is a possibility that they might have become clogged because of mineral deposits. As I understand it, the cold water sandwich happens when first starting to use the hot water. I get hot, then lukewarm, then hot, then lukewarm, and this repeats ad infinitum. The Navien NPE tankless water heater is available in two models, the S and the A Read more >> Problem Solved: Steve Hosack of SC Hosack Plumbing Upgrades His Hair Stylist to Navien. Here's a screen shot of the result, which I think proves I'm not crazy: graph of temperature over time. However, a tankless water heater's output limits the flow rate. Unlike standard units, which continuously heat and reheat water so that it is always hot, tankless heaters generate water warm instantly with high-powered gas burners or electric coils. This is not normal, or natural, or acceptable. I'm living with it but not thrilled about it. Once you have your total flow rate and the required temperature rise, you can find the right-size tankless water heater for your home. I never had any problem like this before last week. For instance, if you set the temperature of the unit to 120° F and the incoming groundwater temperature is 60° F, then the temperature rise is 60°F. The main disadvantage of tankless water heaters is their upfront cost (unit and installation) is significantly higher than tank-style heaters. Enabling the recirculating function, if plumbed for it, will mitigate those effects and give you “instant” hot water when the timing matches up. Electric tankless draws a LOT of electricity, up to 3x 60A. All of my showers are thermostatic so I'm not worried about someone scalding in the tub. The tankless water heater What is the downside of a tankless water heater? Same behavior with all. ps. :). At a minimum the temperature of the water reaching the faucet should be at least 125 degrees to prevent the growth of bacteria. Rinnai. I live in an old house built in the '30s and I have great water pressure. In the Baltimore, Washington, D.C., Northern Virginia, Delaware, and Philadelphia regions, the … I do not have any recirculating stuff in the system. I've got the installer coming back here in a few days and hopefully they'll get it figured out. More posts from the HomeImprovement community. 22. A tankless heater uses the same amount of water compared to a conventional water heater. The better solution is a Hybrid tank; put it in your garage or attic and it'll use a heat pump to draw heat out of the air and put it in the water. Instead I'll have to choose between a power-vented tank or a direct-vent tankless system. The 199,900 BTU Natural Gas Tankless Water Heater is designed to supply continuous hot water for up to 3 bathrooms at the same time. Traditional water heaters can take up to 16 square feet of valuable floor space. Could be flow related, could be high limit switch, could be a bad board...just because it's new doesnt mean there cant possibly be a mechanical/ controls issue right around startup. Maintaining constant shower temperature: Similarly, unlike with a tank heater, the hot water temperature from a non-modulated tankless heater is inversely proportional to the rate of the water flow—the faster the flow, the less time the water spends in the heating element being heated. That’s a common standard. Could be the issue! Which would explain why the issue is less when you have multiple taps open. Press question mark to learn the rest of the keyboard shortcuts. All can factor into the temperature of the water. Tankless water heaters produce an endless supply of hot water, take up less space, have a lower risk of leaking, are safer, and have a significantly longer lifespan on average. The old heater was a 50 gallon tank. They’re equally efficient whether you live in southern or northern regions. Gas and electric water heater temperatures are set at the factory, but can be adjusted for your own preferences with only a couple of tools. I have no experience just ideas I would check if it was mine. Tankless water heaters produce an endless supply of hot water, take up - Furnace repair service heating installation HVAC ac repair heating rebate Hot Water Tanks, Boilers BC Furnace Vancouver Burnaby Surrey Coquitlam Richmond White Rock Maple Ridge Port Moody Delta Abbotsford Aldergrove Pitt Meadows North … The unit should be capable of low fire below 1 gpm and hold a steady temp, but a bad flow sensor is a warranty issue anyway. Thank you for validating that the unit should not behave like it is. The maximum flow rate that our tankless hot water heaters can produce depends on temperature rise — the difference between the set temperature of the unit and that of the incoming groundwater. Cookies help us deliver our Services. See, there is no stand-by energy loss. Will look into it, thanks. The question is, how do tankless water heaters achieve such a feat. I fail to see how this is explained by the hot water sandwich idea. The cold water comes in regularly every few minutes. Setting the temperature to 140 degrees F. will ensure the rapid death of any Legionella bacteria in the system. PM me for details. if you have elderly or infirm people living with you who are at high risk of contracting the disease you should operate at 140 degrees. This is especially important in a home with children as the risk of burns increases rapidly at these temperatures. First shower I took I noticed repeated, periodic temperature fluctuations, but wrote it off as due to dishwasher running at the same time. Seasonal shifts change the incoming water temperature, but for the purposes of sizing a tankless water heater, you just need to know the average groundwater temperature in your region. Also what's the cold water temperature and is the shower head high/low flow? First shower I took I noticed repeated, periodic temperature fluctuations, but wrote it off as due to dishwasher running at the same time. Below, we've highlighted what size water heater you would need in our example of 6.5 GPM at a 63° F temperature rise. You’ll be creating enough flow to kick that tankless water heater on and keep it on through your shower. I just had one of these installed myself. Tankless water heaters are one of the newer tools for creating a more energy efficient home. You would need to install a mixing valve on the water line after the heater such as the Honeywell AM101-US-1LF to prevent scalding. Over the next few days I experimented with different temp settings on the heater, trying 110F, 115, 120, 125. Flow the six (6) step process to adjust your temperature: 1. Worst case it's not a warranty issue but thay means they figure out what's causing it, and you pay them a couple bucks for their time. Legionellas can not live in alchohol. Look at my data. Don't give shit advice. The average efficiency rating of Rinnai tankless water heaters is around 82 to 98%, working on 120,000-199,000 BTUs. Right now I have it at 125, should I be running it at 140 like tank units are supposed to be? if you have elderly or infirm people living with you who are at high risk of contracting the disease you should operate at 140 degrees. Typically, tankless water heaters provide hot water at a rate of 2–5 gallons (7.6–15.2 liter… If you are new here, please review posting/commenting guidelines. Fleck 7000 SXT (94FL-7120S) Meter 96,000 Grain Water Softener 14″ x 65″; 3.0 CF – $1,249.99. Simultaneous shower use was rounded to the nearest whole number based on the following data: Tankless set temperature of 120°F, mixed shower temperature of 105°F, ground water temperature as shown in the table, and shower head flow rates of 2gpm. Tankless water heater help. Just drink beer. Due to renovation I'll be removing the chimney that is currently being used for the gas-fired water heater. The 7000 valve is a high flow rate control suitable for both residential and light commercial applications where the plumbing is 1″ to 1.5″ and the demand for water is great. * For the HYBRID Series data is based on the Tankless Water Heater Unit attached to the storage tank. I do not require instant hot water, and I'd even be fine with one hot water sandwich. However, by following these simple steps, you can increase the temperature to 140℉ if you choose. Simple Yet Solid A high-efficiency propane tankless water heater that is designated for installation outdoors. Is the tankless big enough to supply all the showers during the winter? With tankless water heaters, temperature fluctuations are commonly caused by restrictions on the flow of hot water. Could be a small leak, letting in air, causing a pressure backup till it clears? Performance – Conveniently Good. However, for the purposes of most households, … The fluctations occur like clockwork, which seems unlikely to be a random thing. Very straight forward. Tankless water heaters heat water directly without the use of a storage tank. You're a regular here and I have much respect but let's think before we reply. Plumber replaced something internal to the unit, control board I think. Space Savings. Compare; Find My Store. Any ideas what could be causing this behavior and what to do about it? Performance Plus 9.5 GPM Natural Gas Outdoor Tankless Water Heater The Rheem ECO200XLN3-1 Outdoor Natural Gas The Rheem ECO200XLN3-1 Outdoor Natural Gas Tankless Water Heater can provide up to 9.5 GPM at a 35° temperature rise. Call the plumber or Navien technical support hotline. Finally, a large house of more than 1,600 square feet with three or more bathrooms will need a high-flow tankless water heater with a GPM of close to 10 — or maybe even more. 'it's necessary for us to give the and most accurate information. If you have already set the temperature and are saying to yourself, “I have no hot water” or not enough of it, there are a few factors that may be affecting the heat. Tank at 140°F and the mixing valve should bring the temperature that reaches your faucets to 120°F. Good tip. I ended up installing a NaviLink router to the system to allow me to control operating times to try and prime my house to have hot water on demand most of the time during the day. Tankless water heaters produced by Rinnai are highly trustable. Where are you taking the temperature readings at? You can't run your air conditioner or heater and your water heater at the same time. I was reading that graph entirely wrong. And wouldn't a "leak" let water out? Thanks for the ideas. This tankless water heater is certified for use in mobile homes and features an electronic ignition to help save you money on fuel costs. You don't have a tank so breeding legionella is not an issue. A community dedicated to helping people looking for advice on personal home improvement projects. Model #RU180IN. The mechanical installer has to have a labor warranty on new installs (although some jurisdictions may vary, this is typically the case). Steve Hosack of SC Hosack Plumbing Upgrades His Hair Stylist To Navien Read more >> Navien News. Instead, you'll enjoy warm water on demand for as long as you like—as long as you're working within its limitations. For your safety, Rinnai tankless water heaters come with a maximum temperature default setting of 120℉ to help prevent scalding. Then tried running the hot water full open at one sink while taking a shower, and this significantly reduced the problem. Fill up a clear glass of water at most taps and see if you get bubbles/cloudy water.

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