after flushing a low rumble sound was noticed on the renaii hot water tankless unit. Well, if your hot water is suddenly turning lukewarm/cold after a few minutes, you most likely have a problem with your hot water heater. 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. 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! I would bet the shower head is clogged up enough to mess with the flow. If you are taking a shower and turn the water off for a few seconds then back on the hot water … Typically, the minerals most commonly found ... Summer is well underway and you’ve likely made plans for several backyard barbecues. Hello, I'm hoping someone can help with my water heater problem. If this is the problem, then there are really 2 solutions here. However, we have had several house guests get ice cold showers, even after tutorials on how to adjust the temp. Show More. If I turn off the shower or just wait with the cold water running, about 5 minutes later it is hot again. 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. The problem here is water remaining cold even after you switched the faucet to hot mode. 4091 East 600 North Cold water sandwich or hot water temperature fluctuates. If you had a glass of hot water and you had cold water in your mouth, with a straw you use as the diptube sending the cold water to the bottom of the glass"the water heater", you would have more hot water above the cold water. If it’s broken, cold water fills the top of the heater and begins to flow right out the hot side. 1. 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. Advanced Home Services is the standard when it comes to providing great service. Plan to call Rheem, again. Banging or rumbling noises. Also, if I run both showers at the same time, then the problem shower does not have the problem of getting cold. Water temperature over 167 °F, gas supply shut off automatically under unexpectable flameout. He's replaced the wireing loom and fitted a new fan but the problem still exists. Turn the knob to cold a bit, again, it drops a few degrees, then slowly goes right back up. We just started having the same issue...hot for 5 min or so and then cold. That, is a cold-water sandwich and can be highly annoying. Simply click here to return to Troubleshooting. Since then, Iâve called Rheem, again. Would like to hear any good solutions. Home | Sitemap | What's new | Privacy | Disclaimer | Contact, Copyright. After about 5 to 10 minutes of hot water, the water temp would slowly to drop. 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. 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). Shut off the cold water to the heater. Tankless Water Heater Suddenly Cold. Choose the right model. Comments (6) joed. Hot water runs out in the shower and faucet. It’s possible you may have an issue with the thermostat or gas control valve. (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. You can see where the dip tube is located in this diagram. Here’s a scenario; you come home from a family beach day and everyone in the house needs to take a shower. When the shower is running cold, the sinks upstairs are still running hot. Ask Your Own Plumbing Question. 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. The simplest way to identify a return of water in your house is by going to the Titan Tankless Water Heater. A plumbing system crossover where there shouldn’t be one. 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 … After draining the tank, run the hot water for a few minutes to determine if the unusual smell and colors are gone. With so many wires and small parts, tankless hot water heaters can have a long list of possible problems. I think our contractor is stumped and I'm starting to think the heater is faulty. The initial burst of water is hot, and then suddenly it gets cold. 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. I’ve already mentioned this in more detail in the last section but it bears … We’ll explain what the dip tube is and how to determine this is your problem. He's checked the pump and it's running ok. It takes a few more minutes for the hot water to get back to you. Try increasing the water heater temperature to see if it changes anything. And another thing is that this does not happen in this shower all the time, its intermittent. A tepid or cold stream of water may be an indication that your water heater is not set to the right temperature. A tankless is a direct fired appliance and the water is actually heated to a much higher temp than the touch pad control indicates. I'm very confused and appreciate any suggestions. More specifically, you probably have a bad dip tube. you have hot … Took the shower head off, tapped out the aerator with a screwdriver and hammer. But all of a sudden, it seems like your home’s hot water supply turns cold a lot faster than usual— sometimes even after just a few minutes of use. 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. Open all the hot water taps. We followed Youtube video on how to clean the burner. Contact us for comprehensive plumbing services today! Besides, the filter could also be clogged by dust or unusual stuff from the water supply. of the straw in the water you would have less hot water above the cold water. Email Save Comment 6. This unit is equipped with an internal freeze protection … The cold water will eventually turn to hot after a few minutes. Since tankless water heaters don’t maintain a supply of hot water, it takes time for the cold water to flush out of the pipes and the heated water to reach your faucet. The necessary repairs are often difficult, requiring high levels of skill and expertise. 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. You get a very slow gradual drop in temperature, but it doesn't drop suddenly after a few minutes like the pex solution would. 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. This occurs when a hot water tap was opened and then closed. My Rinnai tankless WH worked for three years with no problem. you have hot water on demand), there is no cause for concern. 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). #3. They can be placed near any hot water-requiring fixtures like washing machines with a power supply. Did this, still no luck. 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. First, you can turn the thermostat down on the water heater. Our water heater is 7 years old. How? There’s nothing to worry about. An intermediate solution is trying to open the tap completely to see if there is any improvement. 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. So I believe when the second shower was running alone it was not drawing enough water through the water heater for it to kick in and heat up. Water heater repair is a delicate task. Before you send out the invites, it’s best to ... Water is essential. So your water heater used to provide an adequate amount of hot water to keep you content. Simply click here to return to. The cold water sandwich effect refers to the tankless gas water heaters. In all cases, tankless water heaters must be property vented. Follow. A dirty water filter on the cold water inlet. Hard water can be and is a problem for pipes—creating hard scale within them that leads to clogs and/or corrosion. I have observed the water heater while running the shower. Be sensible with venting. When a hot water tap is turned, cold water comes out at first while the heater is heating up the hot water and passing it through. 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. Put it back on, voila... hot water, again! Then if I leave the shower running for another 20 minutes, the temp would climb back up again. tried flushing with vinegar, cleaned the filter and checked for dust and bugs. They taught me how to put the water heater in diagnostic mode to check "water flow rate" in each faucet. For instance, tankless water heaters are more efficient than traditional models. Hard water is water that has a higher dissolved mineral content. How? We’re talking about the accumulation of calcium and magnesium. 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. If you see chunks of sediment, or water appears cloudy or rusty. Answered in 2 minutes by: 1/22/2013. So, one answer to your problem is to remove your new tankless water heaters and to go back to a good old tank-style heater. 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. 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. The problem is that I run out of hot water in the winter time when everyone is showering in the morning. When showering, the Titan water heater went ice cold after a few minutes then hot and then cold again, what is the problem? Thanks! The heater has a flow meter in it. Oct 4, 2018 - If your hot water turns cold after a few minutes you most likely have a defective dip tube. If after 10 minutes or so, there is still a flow of water you have a problem with the crossover. Tankless. Some of these issues can be fixed by the homeowner, while others will require a professional HVAC technician. If you ever have your water shut off, you've got a whole tank of water available for you to use. 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. This is when the water heater fluctuates between putting out hot water and then cold water and then back to hot water, etc. 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. For showers, hot water for about 2 minutes and then it goes completely cold! I had this problem and found that the air intake screen was clogged with lint and dust. It's easy to do. If theÂ 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. 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. Water running, about 5 to 10 minutes of hot water heater is too small mistake and ’. 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