Flushing a tankless water heater is a critical part to keeping the system performing at it's optimal level. Most manufacturers recommend annual flushing, but it should be noted that ultimately, the flushing frequency needs to be determined by the hardness of your water. Save my name, email, and website in this browser for the next time I comment. Use the service (isolation) valve and connect the circulation pump (such as a pond pump) to the cold water line (garden hose is OK). Hard water contains minerals which can lead to lime scale build-up. This breaks down the scale and flushes out the sediment. It's safe, environmentally friendly, inexpensive, and very effective. As an Amazon Associate we earn from qualifying purchases. Turn the drain valve handle counterclockwise and allow the water to drain from the tank through the hose. Turn off the pump and pour the vinegar. Rheem RTG20124 Flush Kit – Tankless Water Heater Flush Kit. Tankless Reviews was created with the goal of helping people to understand the benefits and practical knowledge related to tankless water heaters. Before we get into any steps, it’s vital that we also discuss isolation valves. Remove the access panel and use a non-contact voltage tester to make sure there’s no longer power leading to the terminal. Remove the vacuum hose from the TPR port and flush the tank. 4. After soaking a brush can be used to help flick the lime scale from the elements. These kits generally include everything you need, such as a pump, bucket, descaler, and hoses. Flushing your tankless water heater is an important maintenance task to keep your system operating at peak performance, but before starting, you'll need to get your supplies together. Rheem ® Tankless Electric Water Heaters make it easy to enjoy instantaneous, continuous hot water, space-saving design, and significant energy cost savings.. Just follow the three simple steps below to choose the right model and size you need. Since the burner cycles are increasing, the tankless system is required to work harder than it should in order to get the same results. Allow the vinegar to sit in the chamber for 90 minutes to two hours. Disconnect the electrical power going to the heater. Remove hose from service valve and replace service cap. This prevents cold water from flowing into the water heater and hot water from coming out during the cleaning process. Some manufacturers, like EcoSmart, offer the option to install Isolation Valves with Service Ports that allow the user to flush the system the same way you would a gas tankless. To make matters worse, lime buildup isn’t covered in most warranties. There will be both a cold water service port and hot water service port. In electric water heaters the lower element can get buried in sediment which can cause it to work far too hard and consequently burn out. Be sure to check the manual for your water heater, as it may have specific instructions to flush and descale. Simply locate the appropriate water heater sizes on eComfort using your information. Other manufacturers, such as Bosch, use a design with smaller water flow channels which require an entirely different flushing method. You'll be able to observe, ask questions, and take notes. Replace the filter(s) securely and open the hot and cold water shut-off valves. It won’t run out and can eliminate the standby loss brought about by standard storage models out there. Locate the hot and cold shut-off valves and close them to prevent any water getting into the unit while you work. Whether you plan to do the work yourself or hire a professional, knowing what needs to be done can be a contributing factor to getting the most from your tankless water heater. Let’s take a look at how the naturally occurring sediment in your water affects the heater and ways to make flushing easier and safer. Disconnect the electrical power to the tankless water heater. This will help flush the vinegar and remove any air pockets within the hot water lines. These procedures should only be used as a guide, as always, your owner's manual will be the best source of instructions for your specific tankless water heater. Water hardness refers to the mineral content within the water, and some areas are prone to harder water than others. The flushing procedures below are for electric tankless water heaters. Close the access panel and restore power at the breaker. If not flushed properly, the tankless unit could be damaged and require service/repair. Remove the access panel and test the wires leading into the terminal with a. Place your submersible pump into a five-gallon bucket. Unlike a tank heater, you don’t have large volumes of water to sweep up and pull the sediment out, so having a quality pump such as the 91250 from Superior Pump will save hours, if not days, of manual flushing. With the proper care, a tankless water heating system can have a service life of up to 25 years and save you money every month in utility expenses. Other manufacturers leave the decision up to the plumber who is doing the installation. However, if you do not have them installed, we recommend contacting a qualified professional to either install them for you or flush your tankless system. Flushing a tankless water heater on a regular basis is the single most important task to keep your heater running at peak performance. Close (turn off) the three water valves attached to your tankless water heater. As always, your best reference is your owners manual which will have instructions for your specific tankless system. Remove the access panel and test the wires leading into the terminal with a non-contact voltage tester to verify that all power has been disconnected. You can see the difference once you start using it. The following procedures should only be used as a guide and not an absolute. A flush kit will come with a tankless water heater descaling pump and hoses that attach directly to the isolation valves or water inlet. In the event your heater lacks this feature, we strongly urge you to get one installed and hire a professional to flush in the meantime, as it can be a major safety factor when you’re performing a flush or other maintenance. Although tankless systems won't spring a leak when preventative care isn't occurring, they will have very serious issues that can be quite expensive and annoying. How Often Should You Flush a Tankless Water Heater? Most homeowners should flush their water heaters every six months or so, but if you have extremely hard water, you may want to do it more often. Close the valves on both hot and cold water lines. If this happens, professional repair will most likely be necessary. 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