Low Water Pressure. The water draw is greater, and many applications are running at the same time. Just like ignition failure, you should first rule out simple causes such as a low propane tank or an unpaid gas bill. If this is what you need, buy Rinnai RUR98 or Navien. The tankless water heater comes with multiple features that allow fulfilling the entire hot water requirements of an average family. Check if the gas line is adequately sized and for the maximum BTU. If the flow rate is less than the minimum specified for your model, the heater won’t work. Since a minimum flow rate is required to turn on a tankless water heater you can’t turn your hot water faucet on with a trickle or low flow of hot water because it won’t turn on the heater. But if you are using the Rinnai Tankless Water Heater, there is a way of a solution to your problems. Your water heater may struggle to supply the hot water needed or shut down altogether if it becomes overloaded. If your household frequently takes back-to-back showers, you may be familiar with the "cold water sandwich." Each manufacturer should specify the minimum flow rate for the models they supply, measured in gallons per minute. Your Air Supply or Exhaust is Blocked. It is ether too hot or too cold. You should contact technical support to help you trouble shoot the issue and order replacement parts if necessary. Although a second unit might seem like a large investment, it can actually save you money in the long run since you’ll use less water while waiting for hot water to arrive and less gas to heat the water. Calcium and Magnesium are the two minerals that most often cause scaly buildup, and this can impair the function of your water heater if you don't address is. Here are six of the most common problems and maintenance concerns for tankless water heaters: Keep reading to learn what signs to look for when identifying these issues and how to fix them! reservedhome-water-heater.com is a participant in the Amazon The mini tank will always have hot water ready and deliver it to the shower before the tankless warms up. Although tankless water heaters are also called "instantaneous water heaters," they still take time to heat water, so after the trapped water was used up, you were left with a gap of unheated water. One of the most frequent complaints I have seen in many reviews and forums, is: "I didn't get hot water instantly." The list of the error codes can be reached if following the provided links below. Make sure that the shut-off valve, is not closed. Check the plumbing fixtures for local clogging by debris or mineral scale. Due to the long water pipes, cold water that resides inside must be pushed away before hot water reaches the fixture, affecting the comfort. Check the gas burner and does the flame rod generate sparks when the unit is turned on. Make sure that the tap is open enough to ensure the required flow rate, and there are no obstructions in the piping line. When trying to connect or disconnect power to the tankless water heater, Rinnai recommends using the water heater power plug instead of using the Reset feature on the module. Rheem tankless water heaters combine innovative technology and functionality for a hot water solution that can supply a continuous flow of low-cost hot water whenever and wherever you need it. If this happens, you should reduce the demand for hot water by limiting simultaneous applications, and you may want to consider resetting your unit. 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