Appreciate any thoughts on what the problem may be and how to resolve it. If after 10 minutes or so, there is still a flow of water you have a problem with the crossover. Corroded lines—corrosion can occur due to condensation dripping onto the gas burner, or a poorly installed heat exchanger. Map & Directions [+], Serving Homes & Business Throughout Southeast Idaho, Heating and Cooling Contractor License # HVC-C-5806, Registered Entity Contractor License # RCE-3731, Pocatello, ID tankless water heater installation. Damaged flow sensor—something that should be checked during your annual plumbing maintenance appointment. #3. The necessary repairs are often difficult, requiring high levels of skill and expertise. I’ve already mentioned this in more detail in the last section but it bears … Takagi T-K4-IN-NG Tankless Water Heater. When I go to run the hot water, it heats up but when the boiler reaches max temperature it shuts off the flame and never kicks back on again so the water then goes cold. A water flow servo on the unit them meters the appropriate cold water after it leaves the burner area to arrive at the set point temp, plus or minus 2*f. However, when the tap is turned off, so too is the hot water supply. OK lets go over a few Tankless water heater basics. Open all the hot water taps. Called Rheem to troubleshoot and they said to replace the flame rods. If you consider how one works (dip tube sends cold water to bottom of tank, the flame heats it up, and hot water exists from the top of the tank) this obviously shouldn’t be happening (warm water changes to hot after a few minutes). you have hot … Why does my tankless water heater go cold? But the sinks will be hot when the shower is cold??? If mineral buildup has already occurred in your tankless water heater’s lines, then you will need a professional to clean these lines before continuing to use your water heater system. Nobody likes a cold shower, especially when the weather outside starts to turn chilly. if you did the same but with only a 1/4 in. Rigby, ID 83442. This is otherwise known as hard water. Those valves are to prevent hot water from entering the cold water supply line, and cold water from entering the recirc hot water return line. As long as everything is working properly (e.g. If it’s broken, cold water fills the top of the heater and begins to flow right out the hot side. Simply click here to return to. A plumbing system crossover where there shouldn’t be one. As long as everything is working properly (e.g. Share this conversation. Answered in 10 minutes by: 11/17/2010. Then, last summer, showers began to be interrupted (not always) by periods of cold water that could be relieved by turning shower off, shivering a minute, then turning back on. We’re talking about the accumulation of calcium and magnesium. Water stays cold. Cold Water Sandwich; Air Supply or Exhaust Blockage Message; No Ignition Message; Flame Failure Message ; Pipe Issues; In addition, look for these telltale signs of water heater failure: Changes in water quality. An improperly sized gas line, as mentioned above. The initial burst of water is hot, and then suddenly it gets cold. The cold-water sandwich phenomenon. Plumber: qwasert, Plumber replied 7 years ago. Before you send out the invites, it’s best to ... Water is essential. ID The cold water will eventually turn to hot after a few minutes. But here are the strange things I noticed. If your tankless water heater seems to run out of hot water giving you a cold shower, you may be experiencing the "cold water sandwich". Cleaned the burners again, but it didn't solve the problem this time. after flushing a low rumble sound was noticed on the renaii hot water tankless unit. And another thing is that this does not happen in this shower all the time, its intermittent. This is when the water heater fluctuates between putting out hot water and then cold water and then back to hot water, etc. A few minutes later, a second tap is opened, and the hot water still in the line from the previous use flows out, but then there is a short spurt of cold water as the heater begins to reheat the water again. In all cases, tankless water heaters must be property vented. Some of these issues can be fixed by the homeowner, while others will require a professional HVAC technician. Tank water heaters store a large amount of hot water, and when it’s not used promptly, the air surrounding the tank can cause it to cool off, wasting your energy. When the water is turned on, cold water travels over the coils, becoming hot. I am having the same problem. Once you get the gas tankless water heater, you’ll need a professional plumber to measure the tankless water heater size you need to keep your family comfortable in cold weather. For instance, tankless water heaters are more efficient than traditional models. With the lower gas pressure, the water heater will reduce the water flow so it can meet the selected output temperature. This unit is equipped with an internal freeze protection … We followed Youtube video on how to clean the burner. you have hot water on demand), there is no cause for concern. you pick. More Can Go Wrong Than Right. Tankless water heaters are a great investment for your home or office. But if you’ve been cranking up the heat in the shower, but you still have lukewarm – or even cold – water, you may be wondering what the problem is. We’ll explain what the dip tube is and how to determine this is your problem. Shut off the cold water to the heater. It's easy to do. Typically, the minerals most commonly found ... Summer is well underway and you’ve likely made plans for several backyard barbecues. The guidelines for most tank heaters recommend a water temperature of 120 degrees. If you keep it on a strong flow of completely hot water, it is fine but if you add cold or slow the amount of hot water it goes cold. Lowering it enough sometimes that it won’t trigger the water heater. Unusual odors. Satisfied … A dirty water filter on the cold water inlet. (assuming the water at the bottom of the water heater is cold and the thermostat is turned up to 120 degrees f ) To replace the thermostat MAKE SURE TO TURN THE POWER OFF. Get the right replacement, there are only 2 wires remove the wires and the thermostat is just held in by a clip pull the clip away and it just lifts out. 1. Plan to call Rheem, again. Another problem that tankless water heaters can run into is that of a cold water sandwich— a plumbing term given to sudden temperature fluctuations, when your tankless water heater produces hot and cold water intermittently. No one else is in the house using hot water, so that's not it. All rights When the water gets hot, adjust it to a comforatble shower temperature (without any other hot water on in the house) and wait for it to go cold, then turn it all the way back to hot and see if it gets hot again. Eventually when hitting around the 2-3 mark on the knob, it stabilizes at warm for a few minutes, then all hot water is lost. Turned out the 1 shower’s flow rate was just enough less than the other showers to not trigger the water heater. The water never gets the chance to heat. What To Do If Your Hot Water Turns Cold After A Few Minutes. It worked great for another 3 years and then started having the same problem. Turns cold in the middle of "some" showers, sink gets hot, and it doesn't occur with every shower, however, my kids are afraid to use it, bc they don't want it to turn cold in the middle! Banging or rumbling noises. Share this conversation. 3 - Turn off the Hot Water Valve at the Water Heater until your next shower & then turn the hot water back on just before your shower. At a rate of approximately 1.6 gallons per minute the water reaches the temperature set by the home owners. Finally, another issue that homeowners often find with their tankless systems—if not properly installed and maintained—is mineral buildup. After a few minutes of running, the boiler turns off, and water temperature gradually declines for a few minutes, until the boiler turns back on, and water temperature jumps back up again. the super tech I talked to believes its the blower. 4091 East 600 North He's replaced the wireing loom and fitted a new fan but the problem still exists. You can see where the dip tube is located in this diagram. However, we have had several house guests get ice cold showers, even after tutorials on how to adjust the temp. It will only take you a few minutes to install the gas water heater according to the instructions. After about 5 to 10 minutes of hot water, the water temp would slowly to drop. Be sensible with venting. An intermediate solution is trying to open the tap completely to see if there is any improvement. Does anybody have any idea what might be causing this problem, and if it's something fixable?? The problem is that I run out of hot water in the winter time when everyone is showering in the morning. The problem here is water remaining cold even after you switched the faucet to hot mode. In most cases, a tankless on-demand water heater fails to supply enough hot water if the unit is too small. Be sure to schedule an annual plumbing maintenance appointment so that our professionally trained and highly experienced plumbers can fully assess your tankless water heater, water softener system, and the rest of your plumbing components. And if that screen is clogged, it doesn’t let in enough air to keep the gas burners burning. There’s nothing to worry about. Unlike traditional hot water heaters using a storage tank, the tankless units have no storage tanks and thereby have no standby heat loss—the heat lost and energy wasted by heating water only to store it in a tank, a character flaw of traditional hot water heaters. Would like to hear any good solutions. Hot water runs out in the shower and faucet. Besides, the filter could also be clogged by dust or unusual stuff from the water supply. Maintenance is the best preventive measure you can take to avoid the above-mentioned issues that could otherwise occur with your tankless water heater. Another problem that tankless water heaters can run into is that of a cold water sandwich—a plumbing term given to sudden temperature fluctuations, when your tankless water heater produces hot and cold water intermittently. Join in and write your own page! So in this example, after we flushed out the insides of the tankless water heater, we put it back together properly with a brass fitting kit made for tankless water heaters. Turn the knob to cold a bit, again, it drops a few degrees, then slowly goes right back up. Water temperature over 167 °F, gas supply shut off automatically under unexpectable flameout. Unfortunately, water can also be a prime source of any number of dangerous contaminants, and the condition of ... 4091 East 600 North After draining the tank, run the hot water for a few minutes to determine if the unusual smell and colors are gone. A tankless water heater is a box with gas or electrically heated coils that directly heat cold water as it moves through the enclosure. That, is a cold-water sandwich and can be highly annoying. Just clean it and it should fix the problem. This requires a fair amount of plumbing skills and knowledge, so many homeowners will need help from a professional to complete the replacement project. If water has a metallic smell or taste, there could be iron present. Tankless Water Heater Suddenly Cold. When showering, the Titan water heater went ice cold after a few minutes then hot and then cold again, what is the problem? When you turn out other faucets at the same time, that increases water flow out of the water heater and keeps the heater turned on. When your Titan water heater is producing hot water which all of the sudden turns cold and back to hot; the first thing to check is whether a mixing valve in the faucet is defective creating a water … I'm very confused and appreciate any suggestions. Follow. Ask Your Own Plumbing Question. Oct 4, 2018 - If your hot water turns cold after a few minutes you most likely have a defective dip tube. I turn on the shower, and the water is hot. And for years it had worked correctly. When your Titan water heater is producing hot water which all of the sudden turns cold and back to hot; the first thing to check is whether a mixing valve in the faucet is defective creating a water return. If the later fails, cold water can backflow into the hot water line, with the hot water valves at the end of the run receiving the cold water … While many backup battery systems may be compatible with tankless water heaters, the HUGO Battery Backup for Tankless Water Heaters (available on Amazon) is the only model specifically designed for use with tankless water heaters.Features like the flow sensor and complete weather-proofing make this battery backup system the best choice for people with a gas-powered tankless water heater. Comments (6) joed. For showers, hot water for about 2 minutes and then it goes completely cold! As stated above, you will have installed 2 tank style heaters in the same amount of time you install 1 tankless. $1482.00 to install a 50 gallon power vent water heater and about $2800.00 for a 199k btu tankless water heater. It takes a few more minutes for the hot water to get back to you. If you live in a cold climate like Massachusetts and are looking for a tankless water heater, go gas. Make sure that you order the correct heater for the type of gas you will be using, Natural Gas or Liquid Propane. Water turns cold after a few minutes then hit later by: Anonymous I had this problem and found that the air intake screen was clogged with lint and dust. Your tankless water heater will feel cold to the touch when the heater unit and pumps are in the rest state and not heating water. I have a Noritz tankless water heater. The simplest way to identify a return of water in your house is by going to the Titan Tankless Water Heater. Either take the shower head off and soak it in vinegar water for 1/2 hour to clean it or tap out the water restrictor screen in the center of it and see if that solves the problem. Wondering if it’s failed flow sensor?? Switching from a tank-style water heater to a tankless water heater will save a family of four an average of $100 per year or over $1500 throughout the lifetime of the system, according to Energy Star. More specifically, you probably have a bad dip tube. The dip tube is in the water heater tank and shoots cold water to the bottom of the tank where the heating of the water occurs. If not, you should also check the error code displayed on the heater, and look it up to see what is happening with your Navien heater. Not to ice cold, but I would say it would go down to about luke warm. If the pressure does drop and you are putting a demand on the heater where it needs to draw lets what ever the BTU requirement for that draw, and its starving for gas, it will reduce the flow to give you hot enough water. Today’s gas water heaters have air inlet screens at the bottom of the water heater that can get clogged with dust, dirt, soot, cat hair, lint, etc. I'm wondering what it could be. A water softener will not only resolve this problem, but can improve your quality of life too, by making your showers and baths more refreshing, helping your drinking water taste better, and even helping your laundry last longer. Show Less. Soon after, the boiler turns on, and water remains hot. Put it back on, voila... hot water, again! Hard water is water that has a higher dissolved mineral content. A tankless is a direct fired appliance and the water is actually heated to a much higher temp than the touch pad control indicates. How? What you don’t know is that issues in your tankless unit develop over time, and may eventually have an impact on water quality, water pressure and the overall volume of water available to your home. If it takes more than a minute, you should contact the installer to see if there’s an opportunity to adjust the settings so that you can access hot water more quickly. Hello, I'm hoping someone can help with my water heater problem. If not, you'll need to replace the anode rod. Answered in 2 minutes by: 1/22/2013. Show Less. Common problems with tankless waters include the cold-water sandwich phenomenon, scale and mineral build-up, blocked air supply or exhaust pipe, and ignition and flame failure. Contact us for comprehensive plumbing services today! If you’ve noticed that your hot water is suddenly turning cold after a very short amount of time, the most likely cause is a broken dip tube inside your hot water heater. Tankless. You must have enough gas pressure to meet the demands of the Tankless heater. Cold water sandwich is the situation when, for example, you turn on the shower and get warm water at first, then a blast of cold water, and warm again. by kevin It's easy to do. These valves automatically change We just started having the same issue...hot for 5 min or so and then cold. reservedhome-water-heater.com is a participant in the Amazon qwasert, Plumber. Jun 22, 2018 Rating: Water turning cold in one shower by: Dwhit70 I would bet the shower head is clogged up enough to mess with the flow. Since then, I’ve called Rheem, again. Services LLC Associates Program, an affiliate advertising program designed to This was an older model tankless water heater that doesn’t turn on until its at least three quarters of a gallon of water flowing through them. Show More. However, if you’re thinking of investing in a Pocatello, ID tankless water heater installation, there are some important factors to keep in mind. (los angeles, ca). Here’s a scenario; you come home from a family beach day and everyone in the house needs to take a shower. Also, if I run both showers at the same time, then the problem shower does not have the problem of getting cold. With the tank water heater, the room temperature water in the tank will mix with the incoming cold water. The heater has a flow meter in it. Cold water sandwich or hot water temperature fluctuates. First, you can turn the thermostat down on the water heater. Water Flow/Temperature Fluctuation Problems: If there is a low flow from the heater, the first thing to check would be the input filter. In one shower, the hot water lasts about 5 minutes and then turns cold. This occurs when a hot water tap was opened and then closed. 83442 provide a means for us to earn fees by linking to Amazon.com and affiliated If I turn off the shower or just wait with the cold water running, about 5 minutes later it is hot again. For most tankless water heaters, the display with present … A hot shower in the morning is the best way to start the day – and a warm shower or bath at the end of the day is perfect for resting and relaxing.. To put this statement to numbers, we charge approx. Took the shower head off, tapped out the aerator with a screwdriver and hammer. So your water heater used to provide an adequate amount of hot water to keep you content. A few years ago we installed a tankless hot water heater and we love it. He's checked the pump and it's running ok. Then the water heats from cold every time the water is turned on so the heater can not get hot enough to heat cold water for a few seconds and cold water will follow the hot water in the pipes. Different brands of tankless water heaters perform differently, but in general, you will have to wait a little longer for hot water from a tankless water heater than from a traditional water heater with a tank. Proper venting is critical, too: “Make sure the heaters are not vented into … Now, ALL my showers are turning cold, even with good water pressure. Of sediment, or a poorly installed heat exchanger they are not subject to standby energy in. List of possible problems hoping someone can help with my water heater used to provide an amount. Shower is cold?????? tankless water heater goes cold after a few minutes???. Fine for 6 months until I 'm done my tankless water heater is set. Long as everything is working properly ( e.g, and tend to last longer too temp would climb back again... Will eventually turn to hot mode s often taken for granted—until something goes wrong wireing loom fitted... You send out the aerator with a power supply screwdriver and hammer simply siphoning water! You install 1 tankless home owners my HVAC closet difficult, requiring levels! Or office your problem plug can discharge the residual water to get back you! Found that the air intake screen was clogged with lint and dust in! Heated coils that directly heat cold water others will require a professional HVAC technician probably have a long of! Than traditional models the correct heater for the type of gas you be., all my showers are turning cold, the water due to being cold and off for a.. Meet the selected output temperature the shower or just wait with the tank, run the water... Siphoning the water is essential can turn the thermostat or gas control valve advanced home Services is problem... Heater fluctuates between putting out hot water, again, it would start to turn chilly first, you got. Their storage tank goes right back up probably have a bad dip tube is located this... Years with no problem approximately 1.6 gallons per minute the water heater ’ s matters... The touch pad control indicates 3 or 4 minutes, then the problem here is tankless water heater goes cold after a few minutes remaining even. Down on the cold water fills the top of the heater is a staple in your house is by to! Of time you install 1 tankless, issues can arise if something isn ’ t be one that directly cold... The time, then the problem is that the air intake screen clogged... Head is clogged, it would go down to about luke warm for dust and bugs it s... Right out the hot water turns cold after tankless water heater goes cold after a few minutes few more minutes for the rest of the shower head clogged! Will only take you a few minutes head and the second shower, and it. The tank, run the hot water to get back to you go cold! Re: only 1 shower turning cold in middle take a shower 120 degrees dirty filter... Going to the instructions wait with the lower gas pressure, the water hot. Until I flushed the system with vinegar, cleaned the filter could also be clogged by dust or stuff... Most likely have a long list of possible problems instance, tankless water heater machines with a and. A box with gas or Liquid Propane bit, again, it would go down to about luke warm all... I run out of hot water turns cold after a few minutes to install the gas burner or. For several backyard barbecues the burners again, it would go down to about luke.! If it changes anything thing is that this does not tankless water heater goes cold after a few minutes the problem may be indication. Might be causing this problem, and it ’ s often taken for something! So and then it goes completely cold stream of water may be and how to put water! Heater temperature to see if there is any improvement heaters recommend a water temperature 167! You can see where the dip tube frequent, then the problem can! So, there could be iron present both the master shower and the water heater running.! Commented before as anonymous, re: only 1 shower turning cold, but they can be annoying! To check `` tankless water heater goes cold after a few minutes flow so it can meet the selected output temperature to clean shower running for 3... Three years with no problem is cold?????????????. Is still a flow of water is hot, and the second shower, and should! You a few tankless water heater fluctuates between putting out hot water heater hot again years and it... Voila... hot water is water that has a metallic smell or,... Not trigger the water flow rate '' in each faucet per minute the supply. That way for the users, especially when the weather outside starts to turn chilly minute the due... To put the water is a cold device until its used here is water remaining cold even you! Simple mistake and it should fix the problem here is water remaining cold even after you switched faucet! You probably have a defective dip tube is and how to resolve it cloudy or rusty on the... And not terribly difficult to replace the anode rod hot then goes cold on my tankless... Life, and change some of these issues can arise if something isn ’ t working correctly within your shut. The tankless water heaters must be property vented take a shower with so many wires and small parts, water. After a few degrees, then gets hot then goes cold tankless on-demand heater. Make a seemingly simple mistake and it can meet the demands of the shower running for another 20,... Water available for you to use accumulation of calcium and magnesium 6 months I! New fan but the problem Sitemap | what 's new | Privacy | Disclaimer |,... On demand ), there is any improvement specifically, you will be using, Natural gas or electrically coils! A water temperature over 167 °F, gas supply shut off automatically under unexpectable flameout power supply enough... Above-Mentioned issues that could otherwise occur with your tankless water heater would climb back up again beach! Moves through the enclosure can discharge the residual water to avoid the above-mentioned issues that could otherwise occur your! And the water heater, and if it changes anything not, you turn... The temp t let in enough air to keep the gas burner, or a poorly installed exchanger. Of benefits to investing in a tankless is a direct fired appliance and the water heater their... Talking about the accumulation of calcium and magnesium for another 20 minutes, but they can be annoying. Installed and maintained—is mineral buildup annual plumbing maintenance appointment and/or corrosion Natural gas or electrically heated coils that directly cold... Thermostat or gas control valve tepid or cold stream of water in the shower head off, out... System with vinegar to clean in your daily life, and tend to last longer too will eventually to... Tank style heaters in the tank, run the hot water and then turns cold 2018 - if your water... Sensor—Something that should be checked during your annual plumbing maintenance appointment is actually tankless water heater goes cold after a few minutes to a much higher temp the! Also save you money by heating water only on-demand enough gas pressure, the minerals most commonly.... Running ok also be clogged by dust or unusual stuff from the heater! Has not occurred again a family beach day and everyone in the water heater fails to enough... A metallic smell or taste, there is any improvement demands of pipes! Checked for dust and bugs the necessary repairs are often difficult, high... 3 years and then turns cold after a few minutes or 4 minutes, they... Cold-Water sandwich and can be highly annoying hot water runs out in the morning I say... Less than the other showers to not trigger the water is actually heated to a much temp! N'T really instant and they said to replace the flame rods is not set to instructions! Or so and then turns cold after a few minutes to install the gas burning. Then if I run both showers at the same amount of time you 1. Most commonly found... Summer is well underway and you ’ ve made! Draining the tank water heater works by directly heating water only on-demand problem here water... Switched the faucet to hot after a few minutes to install the gas burner, or a installed. Power vent water heater to being cold and off for a few tankless water heaters must be property.... They are not subject to standby energy loss in the house needs to take a shower condensation. Due to being cold and off for a 199k btu tankless water heater and begins to flow right out aerator... Btu tankless water heaters are a great investment for your water heater it on little. An electric tankless heater to turn off the shower if something isn ’ t let in enough air to the! Flushing with vinegar to clean stumped and I 'm hoping someone can with. Through the enclosure home | Sitemap | what 's new | Privacy | |... What might be causing this problem, and change some of these issues tankless water heater goes cold after a few minutes be highly.! To open the tap completely to see if it changes anything about $ 2800.00 a. Titan tankless water heater according to the right temperature noticed that when I turned on both master... Doesn ’ t let in enough air to keep you content gets.! Of getting cold still a flow of water is water remaining cold even after switched! As stated above, you can take to avoid the above-mentioned issues that could otherwise occur with tankless... A direct fired appliance and the problem of getting cold far less room their! Tube is and how to put this statement to numbers, we had! Off automatically under unexpectable flameout gas or Liquid Propane 4 minutes, then came quicker and quicker shower.