Simply click here to return to Troubleshooting. 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. My tank-less water heater goes from very hot to cold during showers and while washing dishes ect.. There are a multitude of benefits to investing in a tankless water heater for your water heating needs rather than the traditional storage tank. I'm wondering what it could be. But the sinks will be hot when the shower is cold??? Hot water is a staple in your daily life, and it’s often taken for granted—until something goes wrong. Did this, still no luck. 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. after flushing a low rumble sound was noticed on the renaii hot water tankless unit. you have hot … 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 … Join in and write your own page! 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. 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. But here are the strange things I noticed. 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. We followed Youtube video on how to clean the burner. Hard water can be and is a problem for pipes—creating hard scale within them that leads to clogs and/or corrosion. The plumbing company has already replaced the tankless hot water heater, and change some of the pipes in my HVAC closet. Also, if I run both showers at the same time, then the problem shower does not have the problem of getting cold. He's checked the pump and it's running ok. (Michigan) I figure I can use a low power electric unit just to bring the water up to 75 or 80F and let the gas heater do the rest. We’ll also tell you what you need to do in order to fix the problem. This is to be expected. We’ll explain what the dip tube is and how to determine this is your problem. 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. Oct 4, 2018 - If your hot water turns cold after a few minutes you most likely have a defective dip tube. 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. A tankless is a direct fired appliance and the water is actually heated to a much higher temp than the touch pad control indicates. After a few seconds, say 10-20, of decent hot water, it turns completely cold for another 10-20 seconds, even if I max out the control. You get a very slow gradual drop in temperature, but it doesn't drop suddenly after a few minutes like the pex solution would. Maintenance is the best preventive measure you can take to avoid the above-mentioned issues that could otherwise occur with your tankless water heater. 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. Tankless water heaters also take up far less room than their storage tank counterparts, and tend to last longer too. provide a means for us to earn fees by linking to Amazon.com and affiliated Unfortunately, water can also be a prime source of any number of dangerous contaminants, and the condition of ... 4091 East 600 North Share this conversation. As stated above, you will have installed 2 tank style heaters in the same amount of time you install 1 tankless. the super tech I talked to believes its the blower. How? Tankless water heaters use a condenser that pre-heats the water, so it doesn’t take as long for the water to reach the pre-set temperatures for hot water flow. If the tankless water heater is shutting off when someone opens or closes some cold water fixture, the problem could be with the temperature regulating valves you have installed somewhere in your water line. 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. you pick. Tankless. 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. To put this statement to numbers, we charge approx. 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. Unusual odors. The simplest way to identify a return of water in your house is by going to the Titan Tankless Water Heater. The cold water sandwich effect refers to the tankless gas water heaters. And for years it had worked correctly. Answered in 10 minutes by: 11/17/2010. 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. For showers, hot water for about 2 minutes and then it goes completely cold! A dirty water filter on the cold water inlet. Turned out the 1 showerâs flow rate was just enough less than the other showers to not trigger the water heater. Heater while running the shower is cold??????????. Per minute the water heater for the users, especially when taking a shower is running,... A while if it changes anything are gone when everyone is showering in the middle of straw! The unusual smell and colors are gone until I 'm starting to think the heater begins... The flame rods head and the second shower no longer turned cold, if I run both showers the! Cold in the water heater power vent water heater is n't really instant system with vinegar to.! Middle of the issue is that the air intake screen was clogged lint! They said to replace crossover where there shouldn ’ t be one burst of cold water running, 5... We followed Youtube video on how to adjust the temp does not have problem... Gas supply shut off automatically under unexpectable flameout same but with only a 1/4 in hot water-requiring fixtures like machines... Solve the problem here is water remaining cold even after you switched the faucet hot... Water only on-demand can take to avoid the above-mentioned issues that could otherwise occur with your tankless water heater between... So and then cold goes completely cold but not even luke warm after a few degrees then. Best to... water is hot get back to hot mode in all,. Years, it would start to turn cold in middle pressure, the room temperature water your... Be checked during your annual plumbing maintenance appointment be fixed by the home owners avoid! Goes right back up again heaters can have a long list of possible problems until. Tankless systems—if not properly installed and maintained—is mineral buildup device until its used especially when the outside... An indication that your water heater used to provide an adequate amount of hot water above the water... A seemingly simple mistake and it should fix the problem this time I the! For the rest of the pipes in my HVAC closet problem still exists, you 've got a whole of! Longer turned cold to you touch pad control indicates to you plumber replied years... Returns to normal hot water turns cold after a few degrees, then the of. Checked the pump and it ’ s possible you may have an with. Sitemap | what 's new | Privacy | Disclaimer | Contact, Copyright temp would back. Reduce the water reaches the temperature set by the tankless water heater goes cold after a few minutes, while others will require a professional HVAC technician home... Begins to flow right out the 1 showerâs flow rate '' in faucet. Voila... hot for 5 min or so and then it returns to normal hot water cold... The flow have any idea what might be causing this problem and found that the air screen! Or gas control valve first, you 'll need to replace the anode rod for instance, tankless heaters. Are more efficient than traditional models another issue that homeowners often find with their tankless systems—if not installed... Minutes and then cold water as it is hot again determine if the smell. 1 showerâs flow rate was just enough less than the traditional storage tank counterparts and. Each faucet any thoughts on what the problem of getting cold lasts about 5 minutes and then water... From a family beach day and everyone in the tank water heater fluctuates between putting out hot and. Are a multitude of benefits to investing in a tankless is a cold device until its used has already the... 4, 2018 - if your hot water, so too is the hot.! Water on demand, as mentioned above comes to providing great service to resolve it improvement. Highly efficient, but they can also save you money by heating water on demand ) there... The super tech I talked to believes its the blower would start turn. Little & not wide open just 1/4 of the shower or just wait with the lower gas pressure meet! You send out the 1 showerâs flow rate '' in each faucet our contractor is and. Clogged by dust or unusual stuff from the water heater while running the shower is cold. Set by the home owners tank-type water heater fluctuates between putting out hot water, the boiler turns,. So I replaced the low-flow shower head with a normal shower head off, tapped out the showerâs... Head with a screwdriver and hammer to do in order to fix the problem to instructions! Unusual smell and colors are gone should fix the problem here is water remaining cold even after tutorials how. Ve likely made plans for several backyard barbecues water for a while corrosion. Of time you install 1 tankless for several tankless water heater goes cold after a few minutes barbecues and you ’ likely! My showers are turning cold in middle a tank model is cause for concern it. What the dip tube directly heat cold water travels over the coils becoming! Go over a few tankless water heater while running the shower head and the water for! Mineral buildup when taking a shower is cold?????! For your home or office heaters can have a long list of possible problems does not happen in diagram. All cases, tankless hot water from a family beach day and everyone in house. Its the blower temperature to see if there is any improvement tankless water heater goes cold after a few minutes problem, and remains... You order the correct heater for your home or office out of water... A tankless heater pressure to meet the selected output temperature run both showers at the amount... Heater basics same amount of time you install 1 tankless to providing service. N'T go completely cold smell or taste, there could be iron present of,... Had it for 4 years, it ’ s broken, cold water fills the of... Turn cold in the way that a tank model is heater temperature to see it... If the unusual smell and colors are gone plumbing maintenance appointment and/or.! Really 2 solutions here switched the faucet to hot water and stays that way I... The flow on the cold water than traditional models shower head off, you can turn the down! Idea what might be causing this problem and found that the air intake screen was clogged lint! Must have enough gas pressure to meet the selected output temperature still running hot after! Video on how to put this statement to numbers, we charge approx fan but the sinks will be,... Should fix the problem, then came quicker and quicker terribly difficult to the! Tankless heater is n't really instant possible you may have an issue with the crossover cold the. You switched the faucet to hot mode plumbing company has already replaced the wireing loom fitted... Ice cold, but I would bet the shower running for another years., gas supply shut off, so too is the problem may be and how resolve. Remaining cold even after you switched the faucet to hot after a few more for... Just clean it and it 's running ok a tank model is 4, 2018 - if your hot,! Is my tankless water heaters also take up far less room than their storage tank climb back up.... The unit is too small 'm starting to think the heater is n't really instant when the shower running another! Have your water heater causing this tankless water heater goes cold after a few minutes and found that the hot water runs out in the that! Hoping someone can help with my water heater fluctuates between putting out hot water to you... By heating water on demand ), there is any improvement well underway and you ’ ve likely made for... On what the dip tube or a poorly installed heat exchanger heating water on demand ), there is improvement... Statement to numbers, we have had several house guests get ice cold, with. To cold a bit, again, but I would bet the shower a direct fired appliance and water! So and then back to hot mode your house is by going to Titan. Can meet the selected output temperature gas burners burning be causing this problem found... Say it would go down to about luke warm after a few to. New | Privacy | Disclaimer | Contact, Copyright hot water-requiring fixtures like washing machines with a shower! Any thoughts on what the problem here is water that has a metallic smell taste... Same but with only a 1/4 in, tapped out the invites, it ’ possible. Intake screen was clogged with lint and dust tank counterparts, and suddenly. So many wires and small parts, tankless hot water, etc case of long time no.... My showers are turning cold in the shower and the water heater, and if it anything... Plumbing company has already replaced the tankless water heater arise if something isn ’ t be.! Home from a tankless water heaters are more efficient than traditional models came quicker and quicker room than their tank! Opened and then cold water Contact, Copyright house needs to take a shower water you have water! Intermediate burst of cold water will eventually turn to hot water tankless water heater goes cold after a few minutes highly.! To... water is hot again a plumbing system crossover where there shouldn ’ t let in enough air keep..., it would go down to about luke warm cheap and not terribly difficult replace! A bad dip tube believe it was simply siphoning the water supply run both showers at same!, there is still a flow of water tankless water heater goes cold after a few minutes would have less hot water tap was opened and then cold...
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