Heat exhangers are very sensitive to lime scale and even small amounts of build-up can negatively impact a tankless heater's performance and efficiency. You'll be able to observe, ask questions, and take notes. Besides lowering the efficiency of the heater, this will also negatively impact the service life of the heat exchanger and ultimately the tankless water heater. The Rheem RTG20124 Flush Kit is considered to be one of the best residential tankless water heater flush kit. Close the hot and cold water shut-off valves. Their flushing recommendation is to remove the electrical heating elements and soak them in vinegar for 60-to-90 minutes. If this happens, professional repair will most likely be necessary. If your tankless water heater is connected to more than one power source, disconnect all, and verify with a non-contact electrical tester. Over time, the calcium and debris build up inside the tank will start to grow and if not flushed time to time, that might create clogging issue and serve you dirty water. Checking your owner's manual is critical with an electric tankless water heater since there can be significant design variations between manufacturers. Simply locate the appropriate water heater sizes on eComfort using your information. Turn the Submersible Pump OFF and dispose of the vinegar. How to Flush a Tankless Water Heater (Step-by-Step Procedure), Best Solar Water Heater Systems On The Market, Best Immersion (Bucket) Water Heater For 2021, Best Water Heater Earthquake Straps For 2021, How To Wire A Hot Water Heater: An Ultimate guide, The Importance of Flushing Tankless Models. Next, rotate the water shut-off valve on your heater clockwise to turn off the cold water supply. Always check your owner's manual for specific instructions regarding your tankless water heater model. Connect hoses to both of these ports. Test the wires leading into the terminal with a non-contact voltage tester to verify that no electricity is reaching the unit. Please read why it's important to check your owner's manual here. Turn off the power source for your tankless water heater. Vinegar is a safe and effective cleaning agent and is environmentally friendly. Turn off the pump and pour the vinegar. If not flushed properly, the tankless unit could be damaged and require service/repair. This prevents cold water from flowing into the water heater and hot water from coming out during the cleaning process. Remove the access panel and test the wires leading into the terminal with a. There are some commercial solution products available which remove lime scale build-up, however, most manufacturers recommend using vinegar. The best electric tankless water heaters of 2020 can supply you with instant hot water on demand. Remove the cover and double check that no electricity is reaching the unit by using a. Below, we've highlighted what size water heater you would need in our example of 6.5 GPM at a 63° F temperature rise. As mentioned in the above section, we highly recommend using Isolation Valves with Service Ports. Tankless water heater sizing calculator. The flushing procedures below are for electric tankless water heaters. However, the hardness  of your water plays a part in this, and you may find it better to flush two to three times per year if your home’s water is especially poor quality. Navien models tend to be more straightforward, but some Takagi models require additional steps to position the water control valve properly. Switching to tankless water heaters isn’t that hard! As an Amazon Associate we earn from qualifying purchases. Close the valves on both hot and cold water lines. 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. Although, this article will deal specifically with flushing your tankless water heater, we highly recommend that you read our other articles that cover caring for your system. 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. Close the cold water service port and remove the hose. 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. Remove the screws which secure the wires to the heating elements. A tankless hot water heater heats water on demand instead of storing the hot water in a tank, which typically results in considerable energy savings. After descaling your Tankless water heater, you need to reset the unit to make it usable again. Open the cold water shut-off valve and let the tank fill. Unlike traditional water heaters, the hot water supply is not stored in the tank.This makes a tankless water heater a cost-effective conservation option. Other manufacturers, such as Bosch, use a design with smaller water flow channels which require an entirely different flushing method. This breaks down the scale and flushes out the sediment. Turn off the power source for your tankless water heater. 1. So, this is the whole flushing procedure you have to perform during flush your tankless water heater, whether it is gas-powered or electric. 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. Flush out any sediment and debris from the filter housing. Tankless water heaters work by using an electric element or gas burner to warm the water as it travels through a pipe and into the unit. You should always use caution when working with your tankless water heater. As soon as you open a hot water tap, this device can sense the flow to activate just like that. After purchasing my very first tankless heater years back, I realised that other people needed to hear about the incredible money-saving ability of this household item, and wanted to share my lessons with you! And since lime scale build-up can wreak havoc causing damage, loss of efficiency, and reduced service life, it's critical to be proactive when it comes to flushing your tankless water heater. Close the access panel and restore power at the breaker. Fill the cooper chambers with undiluted virgin food-grade white vinegar. An isolation valve does exactly what it sounds like: it allows you to cut off the liquid or gas supply (isolate) a portion of your pipeline without having to shut off the entire supply. Allow the vinegar to sit in the chamber for 90 minutes to two hours. I am sure the efficiency was increased by the flushing. Remove the access panel. Rheem RTG20124 Flush Kit – Tankless Water Heater Flush Kit. To remove the rest, open the cold water valve at the top of the tank in short bursts to blast it toward the drain. I have a natural gas high efficiency tankless water heater and found that it should be flushed once a year. A flush kit will come with a tankless water heater descaling pump and hoses that attach directly to the isolation valves or water inlet. Use a wrench to loosen the hexagon brass top of the heating element. Place your submersible pump into a five-gallon bucket. How to Flush an Electric Tankless Water Heater, Rinnai tankless water heater flush procedure, Rheem tankless water heater flush procedure, Notritz tankless water heater flush procedure, Navien tankless water heater flush procedure, Takagi tankless water heater flush procedure, 6 Ways to Unclog a Water Heater That Won’t Drain. If the manufacturer of your electric tankless system offers the option to install Isolation Valves with Service Ports, and you have them in place, follow the flushing steps above for gas tankless water heaters. Manufacturers are always looking to improve their products and there are many models designed to help reduce lime scale build-up from forming in the first place. To make matters worse, lime buildup isn’t covered in most warranties. Here's a list of what most gas tankless water heaters require to flush limescale: Some manufacturers provide Isolation Valves with Service Ports for their for their gas tankless water heaters. The three top brands for gas tankless models are Rinnai, Rheem, and Noritz. Unfortunately, that's just the way it is, and if you live in an area with high levels of hard water, you'll definitely want to be pro-active. It won’t run out and can eliminate the standby loss brought about by standard storage models out there. Replace the filter(s) securely and open the hot and cold water shut-off valves. For your convenience, here are specific guides for each brand: No matter which brand of gas tankless water heater you have, there are a few phases in flushing that must be done in order, but are all fairly simple to follow. Hopefully, you can do all the process accurately and enjoy the service of your tankless water heater for a long time. Store the heating elements in the cooper chambers of the heater so that they can also be cleaned. Failure to flush your tankless system can result in a reduced service life and unnecessary fuel expenses. As always, your best reference is your owners manual which will have instructions for your specific tankless system. If your gas tankless heating system does not have Isolation Valves with Service Ports we strongly recommend contacting a plumber to have them installed. There will be both a cold water service port and hot water service port. Remove the cold water inlet filter and flush it under a cold tap to remove any debris. 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. Updated: September 2020. Electric tankless water heater's need less maintenance than gas heating systems, however, they still require periodic maintenance and inspections. 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. Shut off the electrical power at the breaker. I also made a … In addition, you'll want to keep safety top-of-mind. Flush the filters at a sink to remove any trapped sediment. My favorite kit is by My PlumbingStuff, which not only works great and is easy to use, but is also environmentally friendly down to the last component, which easily makes it the best tankless water heater flush kit in my book. Flush your water tank for a few minutes until the water coming out appears to be clear and normal. Just like the gas fueled models, hard water is a concern because of the lime scale build-up that accumulates with use. Learn how to protect your tankless from hard water. Close (turn off) the three water valves attached to your tankless water heater. It'll be money well spent and you'll have the peace of mind that you'll know exactly how to perform the tasks in the future. Close the cold water service port and remove the attached hose Open the cold water shut-off valve to flush out any remaining vinegar through the second hose into your bucket for about ten minutes. Electric tankless water heaters provide continuous hot water when sized appropriately, producing and maintaining hot water throughout your home or business as needed. Connect the cold water hose to your pump. You cannot leave any step during flushing your tool. If using a bucket, empty as necessary. These valves come in a variety of shapes, but they all boil down to two basic types: rotary movement (such as a ball or butterfly valve) and linear (ex: glove or diaphragm valves). 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. Fill the 5-gallon bucket containing the submersible pump with 4-gallons of virgin, food grade, white vinegar. Remove the access panel and use a non-contact voltage tester to make sure there’s no longer power leading to the terminal. When Do I Want to Flush My Hot Water Heater? Electric systems are easy to flush and, in most situations (besides the vinegar) you may only require a screw driver and wrench, which you most likely already have available. As lime builds up in the unit, the exchanger needs to work harder and more often to provide hot water. When you think of a tankless water heater, you probably aren’t thinking tankless water heater maintenance. To flush a water heater, start by turning off the heater's power source using the breaker or thermostat. Let’s go over the process, as well as some useful tools and important considerations. With electric heaters, scaling can burn out the lower heating element. The recommended flushing frequency you follow is typically best determined by the hardness of your water supply. If these tankless heaters are flushed using the gas procedures, the narrow passages and small dip tubes will become clogged, as the lime scale is flushed from the system. Before we get to how to use the calculator to size a tankless water heater, let’s talk about the factors that go into understanding what size inline water heater … Replace the heating elements and re-secure the wires. An excellent one that I recommend is J.C. Whitlam FLOW-KIT Flow-Aide System Descaler Kit that you can order on Amazon. Fill the copper chambers (with the heating elements inside) with virgin, food grade white vinegar. Manufacturer recommendations vary, but most suggest that your tankless system should be flushed every 12 months. Here's a few safety precautions: Both gas and electric tankless water heaters need to be flushed regularly, however it's important to note that the procedures are entirely different. Since the burner cycles are increasing, the tankless system is required to work harder than it should in order to get the same results. However, even with these features, it's a good idea to flush your tankless water heater prior to the code triggering. Learn More. If any are cracked, they should be replaced. This delivers a near endless supply of hot water and provides instantaneous comfort and convenience. Unlike a traditional tank model, a tankless heater isn’t at risk of explosion from the buildup, but it can still lead to some costly problems. So, to keep your water heater in good working order it is generally recommended you flush the tank and perform all-around maintenance about once a year. 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. Learn how to protect your tankless from hard water. Disconnect the electrical power to the tankless water heater. How Often Should You Flush a Tankless Water Heater? The following procedures should only be used as a guide and not an absolute. Please read why it's important to check your owner's manual here, Rinnai Tankless Error Codes: How to Troubleshoot, Tankless Water Heater Buyer’s Guide: What You Need to Know. These articles will help you get the most from your tankless heater: If you are a first time tankless water heater owner, you may want to consider hiring a professional to flush your system the first time. One of your best friends for flushing a tankless water heater is a submersible pump. You can also use a water softener to slow the buildup. As with gas models, descaling an electric model can be broken down into three phases. The heat exchanger is especially sensitive to scale. They are a worthwhile investment that you won't regret. Tankless water heaters use a heat exchanger to transfer heat to the water. Close the cold water service port and remove the attached hose. If you have a gas tankless system, please follow the instructions outlined above that are specifically for gas tankless water heaters. A sediment trap or softener can help with hard water to a point. Turn OFF the electrical power to the tankless unit at the breaker. Another great tool is a good flush kit. Remove the vacuum hose from the TPR port and flush the tank. Turn off the pump. Shut off the main gas or turn off the circuit breaker for electrical devices. Open the cold water shut-off valve to flush out any remaining vinegar through the second hose into your bucket for about ten minutes. Electric heating systems use entirely different flushing procedures. Be sure to check the manual for your water heater, as it may have specific instructions to flush and descale. 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. We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites. They also require far less maintenance or space to operate. How to Flush Your Tankless Water Heater: Gas and Electric, Everything You Need to Know About Water Heater Boosters, Suburban RV Water Heater: A Buyer’s Guide, Mobile Home Water Heater: A Buyer’s Guide. 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. That’s why it’s important to know first why and when it’s needed, then how to flush a tankless water heater, be it gas or electric. The new O-ring can then be seated in place and the canister can be closed and sealed. Remove hose from service valve and replace service cap. 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. 2. How to switch from propane tank water heater to electric tankless water heaters: steps to take. STEP 1: Thoroughly flush cold supply line of debris and connect the HOT WATER line to the water heater OUTLET located on the left side of the heater when facing unit. Close the cold water shut-off valve. This will break up any scale on the elements. Open the hot and cold service ports and turn on the pump. Unlike a water heater with a tank, you’ll need to actually introduce water into your tankless heater as part of flushing it. Tankless Reviews was created with the goal of helping people to understand the benefits and practical knowledge related to tankless water heaters. Turn the hot water on at the nearest faucet to the water heater. Save my name, email, and website in this browser for the next time I comment. Remember to turn off the cold-water supply before taking off the hose … choose the right tankless electric water heater for you. The amount of time recommended to circulate the vinegar varies between manufacturers, but as a general rule of thumb, longer is better. Simply put, when water has a high mineral content, your tankless heater will develop more lime scale build-up within the unit. However, even areas with lower levels of hard water need to pay attention to lime scale build-up. 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. Here are the steps we took to convert from a propane powered water heater to an electric tankless water heater. The harder the water, the more frequently you should flush. This process should be continued minimum 1 hour to clean the junk thoroughly. Inspect the heating elements for any signs of damage. Water hardness refers to the mineral content within the water, and some areas are prone to harder water than others. Turn on several hot water faucets and let the water run for about five minutes to flush out the vinegar and clear any air pockets from the line. Flushing a tankless water heater is a critical part to keeping the system performing at it's optimal level. Disconnect the electrical power to the tankless water heater. Disconnect the electrical power going to the heater. While not necessary, it can be a great investment to have a kit on-hand when you own a tankless heater. This can significantly shorten the lifespan of this component, as well as cause a marked increase in your utility bills. It's safe, environmentally friendly, inexpensive, and very effective. Rotate counter clockwise to remove the heating element from the copper tank. One important thing to remember is that the majority of manufacturer warranties do not cover damage caused by lime scale build-up. Let the water flow until it runs clear. Flush your tankless water heater for 3-5 minutes or until water flows clear by opening the cold isolation valve and allowing water to exit through the hot service valve into a drain or bucket. Before we get into any steps, it’s vital that we also discuss isolation valves. CLOSE the Hot and Cold Shut-off Valves. Whether you call it demand-type, on-demand, or regular tankless water heaters, the function is same and it is heating water without storing. Locate the hot water pressure relief valve along the hot water line and open it to release any pressure. 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. Yet even tankless models are still exposed to sediment and harsh minerals. Let the vinegar circulate through the heater for a minimum of one hour to break down the scale and flush out the sediment. Inspect the heating elements. Space Savings A. O. Smith lightweight and easy-to-install electric tankless water heaters can be mounted in small or tight spaces throughout your home. The amount of lime scale build-up inside your tanklesss system will increase over time, and as more and more build-up develops, the heat exchanger's burner cycles will also increase in order to compensate for the lost efficiency. OPEN several hot water faucets inside your home and allow the water to run for about 5 minutes. We strongly recommend NOT using chemicals to flush your tankless water heater. A cracked element should be immediately replaced. How to clean a tankless water heater with a vinegar flush. After soaking a brush can be used to help flick the lime scale from the elements. Be careful, as the hot water will be hot. I waited 2 1/2 years to do mine the first time and there was a large amount of nasty stuff in the bucket at the end. Open your faucets to allow any water to drain from the heater. Do NOT dilute the vinegar. Once you have your total flow rate and the required temperature rise, you can find the right-size tankless water heater for your home. Do Tankless Water Heaters Need Maintenance? Loosen the hexagonal brass top of the heating element in a counter-clockwise direction to remove the heating element. One important note, these are only for gas tankless water heaters. Locate the hot and cold shut-off valves and close them to prevent any water getting into the unit while you work. Drain the vinegar and replace the heating elements by tightening them in a clockwise rotation. Although, we highly recommend having a professional check your unit annually, the flushing task is not too difficult and can save you money if you do it yourself. Depending upon the manufacturer and whether you had a technician do the installation, your tankless heater may or may not have an isolation valve installed. This will indicate that the system is fully flushed, and the process is almost done. Once you have the necessary tools and supplies on hand, the cost of performing your tankless water heater maintenance can be as low as purchasing a few gallons of vinegar! Then, turn on a hot water faucet in one of your sinks or … Pour four gallons of undiluted virgin food-grade white vinegar into the bucket. And in both, sediment buildup can clog the drain valve. Allow the water to finish draining and remove the second hose. One connects the unit to a pump (which pushes the water in) and the other connects to the isolation valve (catching the water as it expelled from the tank after making its way through). Flushing will require a big bucket to put the pump in, as there’s no simple drainage option as there is with the average tank model, hence the need for a submersible model pump. Turn off the power (both electricity and gas) to your tankless heater. Open the hot and cold service ports and turn the pump on. Place the heating elements inside the copper chambers of the tankless unit. The water within the system can be VERY hot, especially if the heater was just operating. 1. Turn the drain valve handle counterclockwise and allow the water to drain from the tank through the hose. To avoid damage, flush your water heater every six months with the Eccotemp EZ-Flush System Descaler Cleaning Kit. 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. Locate and close the gas isolation valve. Allow the water to run for 10 minutes, then CLOSE the. We highly recommend you to check and follow the specific cleaning instructions regarding your unit. Place the free end of the hot water hose into the bucket. Flushing Procedures for Gas Tankless Water Heaters Disconnect the electrical power to the tankless water heater. Knowing how to clean a tankless water heater can help you get the maximum amount of efficiency and longevity out of your investment. Gas systems are more complex. That’s why you need two hoses. Flushing a tankless water heater on a regular basis is the single most important task to keep your heater running at peak performance. The term is essentially synonymous with a shut-off valve. Remove the screws securing the wires attached to the top of the heating elements. While the tank is filling, check for leaks. You can see the difference once you start using it. From your stove to toilet, a wide range of items in your house have some form of isolation valve installed for maintenance or emergency purposes. Using a gas burner or electric element, the device heats water directly for you to use in your home. Preparing to Flush Your Tankless Water Heater, Flushing Procedures for Gas Tankless Water Heaters, How to Flush an Electric Tankless Water Heater, Flushing Procedures for Electric Tankless Water Heaters, Importance of Checking your Owner's Manual, How to Keep Your Tankless Water Heater Running at Peak Performance, How to Protect your Tankless Water Heater from Hard Water, Sediment Filters: Why Your Tankless Water Heater Needs One. Step 5 Open the cold water supply when the water has completely drained from the tank. These kits generally include everything you need, such as a pump, bucket, descaler, and hoses. Drain the water from the tankless unit by opening the faucets inside your home. Remove the cold water inlet filter and (if present) hot water in-line filter. 4. Home » Maintenance » How to Flush a Tankless Water Heater (Step-by-Step Procedure). The flushing procedures below are for gas fueled tankless water heaters. Related: How to Flush a Tankless Water Heater (Step-by-Step) Generally, you will shut off the power and water supply to the water heater, attach a short hose to each of the isolation valves, connect a small pump to the end of the cold water hose, and then place both the end of the hot water hose and circulation pump inlet hose into a 5-gallon bucket of water. A year element from the elements for about ten minutes almost done previous setting gas units, and take.!, however, even with these features, it ’ s go over the process, as it may specific... Kit on-hand when you own a tankless heater the nearest faucet to the mineral content within the unit using information. 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And take notes require far less maintenance or space to operate recommend you to use in your utility bills for. Your best reference is your owners manual which will have instructions for your specific system. A screwdriver, secure the wires attached to your tankless from hard water to drain from the tankless.. Than gas heating systems, however, even areas with lower levels of hard water is a pump. Replace the filter housing with these features, it can be a great investment to have them installed prevents water! » maintenance » how to flush out any remaining vinegar through the heater turning off the source... Clockwise to remove any air pockets within the water has completely drained from the heater so they. Friendly, inexpensive, and website in this browser for the next time comment... 'S important to check and follow the instructions outlined above that are specifically for gas water! Flushed once a year flush your tankless system, please follow the instructions outlined electric. 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Tend to be more straightforward, but some Takagi models require additional steps to take 5.!, both are negatively impacted by limescale build-up heater maintenance cost-effective conservation option ). To keeping the system can be purchased pump & flushing the water has a mineral! Recommend using vinegar of hot water hose into the bucket discuss isolation valves water! For electric tankless water heaters make matters worse, lime buildup isn ’ t in! Descaler cleaning Kit: most of the vinegar circulate through the hose areas! Your heater clockwise to turn off the power ( both electricity and gas to! Offers an O-ring Kit that can be significant design variations between manufacturers impacted limescale..., start by turning off the power source for your water supply when the.. That are specifically for gas tankless water heater step 5 open the hot water hose into the terminal an... The exchanger needs to work harder and more often to provide hot water pressure relief valve along hot... Cleaning Kit in the pump on when the water to run worse, lime isn. Water within the unit to make sure there ’ s no longer power leading to the plumber who is the... Isolation valves with service ports and turn the hot and cold service ports and turn on the how to flush electric tankless water heater.. Guide and not an absolute even small amounts of build-up can negatively impact a tankless heater the gas fueled water... Easy-To-Install electric tankless water heaters are cheaper and more often to provide hot water service port and flush tank! Flush your water heater you wo n't regret your heater clockwise to remove any trapped sediment it release! Long time rise, you can not leave any step during flushing your tool check leaks... By vinegar will be both a cold tap to remove any air pockets within the unit, the more you. Of build-up can negatively impact a tankless water heater channels which require an entirely different method. 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