How To Clean My Tankless Water Heater?

How to Clean a Tankless Water Heater [A Complete Guide]

Tankless water heaters require less maintenance than storage systems on average, although they do require regular maintenance, such as cleaning.Because the hardness of the water determines how long it will take to maintain the system, there is no defined time range.Because mineral deposits accumulate more quickly in hard water locations than in soft water areas, systems in hard water areas will require cleaning more frequently than systems in soft water areas.When using a tankless system, this often takes longer since it drives minerals through the system rather than allowing them to build up at the bottom of a tank.In most cases, when it comes to tankless water heaters, an alarm will sound when maintenance is required.

How to Clean a Tankless Water Heater

  • The first step is to turn off the power source. If the tankless water heater is powered by gas, then turn off the gas supply to the unit. If the problem is electric, shut down the circuit breaker. Make a list of all of the materials that will be required. You will require the following materials: 5 gallon bucket
  • 2 stainless steel washing machine hoses
  • submersible pump
  • 4 gallon bucket of white vinegar (food grade)
  • a pair of rubber gloves

If you don’t already have these goods, you can purchase them as part of a kit.Step two: Turn off the water valves on the three water lines.Three types of valves are used: one for cold water entering the system (typically blue), one for hot water exiting the system (usually red), and one for water delivery to the residence (usually yellow).Depending on the manufacturer and type of your tankless water heater, they might be either handles or knobs.Assuming they are handles, the water is switched on when the handles come into contact with the pipe.When they are perpendicular to the pipe, the water is shut off automatically.

Ensure that you have unplugged the unit from the wall socket if you haven’t already.The third step is to remove the purge port valve lids from the purge valves on both the hot and cold water lines.Because they have small handles, it is important to move them cautiously in order to alleviate any pressure that has built up and to minimize any hot water spilling.It is necessary to handle the caps with care in order to ensure that the rubber washer sealing discs remain in place.

  • To guide the water into the bucket, step four involves connecting the housing lines to the valves.
  • When connecting the hose to the hot water, use extreme caution to avoid burning yourself.
  • Allowing the water to flow into the bucket requires opening the purge apertures.

In order to test the temperature of the hot water before opening it totally, open the hot water side slightly and allow it to drip out before fully opening it.When the water has completed draining, leave the hoses in place and remove the water bucket from the sink.Approximately four gallons of food-grade white vinegar should be added to the bucket.

  1. Vinegar is a non-chemical cleaning solution that works well.
  2. Chemicals or other vinegars should not be used to clean the water system since they can be harmful to your health as well as the health of the water system itself.
  3. As soon as the bucket is full with vinegar, link the ends of the hoses to the submersible pump and submerge it in the vinegar before plugging it in or turning it on.
  4. When you turn it on, it will begin to circulate the vinegar through the system immediately.
  5. Allow it to run for anything between forty-five and ninety minutes.
  6. Step Six: While the vinegar is being pumped through the pump, remove the face plate of the heater and the air filter from the heater.

Replace it after rinsing it well and drying it.Reinstall the faceplate by screwing it in place.When the vinegar has completed pumping, disconnect the pump and carefully get it out of the bucket of vinegar.Step Eight: Remove the vinegar from the bucket and place it beneath the water heater.

Afterward, reconnect the hose to the cold water side of the faucet and put the top back on.Open the water valve and let 4 to 5 litres of water to circulate through the system before closing it.Close the valve as soon as possible.Remove the water filters from their mounting brackets and thoroughly rinse them before reinstalling them.Step Eight: Reattach the caps and secure everything in its proper place.

Once everything is properly secured, switch on the cold water valve and listen for the sound of running water.Install the hot water heater, then the gas and central circulation valves, and then complete the installation.After that, you may reconnect the system and continue using it as usual.


These processes may differ somewhat from one manufacturer to another or from one model to another.Make sure you read the owner’s manual for your exact make and model before you start.Some models come with cleaning hoses, whilst others may not be equipped with them.You can get a tankless water heater cleaning kit if you feel the need to do so.On the internet or at select places, you may get food-grade white vinegar in quantity.It is not recommended to use any other type of vinegar because it might damage or stain the system, and it is also not recommended to use chemicals since they can linger in the water and be harmful to your health.


Never clean your tankless water heater without first shutting down the electricity and gas to the unit.If your tankless water heater is linked to more than one power source, unplug them all and check with a non-contact electrical tester to make sure everything is working properly.We strongly advise you to review and adhere to the particular cleaning instructions for your machine, which are available on the manufacturer’s website.Any mistreatment might result in damage that necessitates the need for servicing or repair.Hi, Hello, my name is Luis.″TheHeatersGuide″ is written by an author.

I am a Mechanical Engineering graduate with a bachelor’s degree.At the moment, I’m investigating heating technologies.However, I have learnt many different house heating approaches and am still learning about home heating technology today.And I like disseminating the results of my study and reviews.

How to Maintain a Tankless Water Heater

Article to be downloaded article to be downloaded In the course of time, minerals can accumulate in a tankless water heater’s heating chamber, where they can build up and damage the walls of the tank’s heating chamber.You must flush and remove the mineral deposits from your tankless water heater’s tank at least once every year in order to keep it in proper working order and cleanliness.Continue reading to find out how to properly maintain your tankless water heater in order to guarantee that it operates at peak performance and energy efficiency.

Steps Download Article

1 Turn off the electricity to your tankless water heater’s electrical system. This can be accomplished by shutting down the main gas line or turning off the circuit breaker for any electrical equipment present.

  • Using the three water valves linked to your tankless water heater, close and turn them off. While cleaning, this approach will prevent cold water from flowing into the water heater and hot water from flowing out during the cleaning process
  • however, it is not required.
  • The water valves are comprised of three parts: a cold water valve that is often blue in color, a hot water valve that is typically red in color, and a third main valve that brings water into your home.
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  • 3 Remove the purge port valve caps off the purge valves that are situated on each of the cold and hot water valves one at a time, working gently. The purge valves are distinguished by their little handles that mimic the letter ″T.″
  • In order to alleviate any pressure that has built up inside the valves, this technique must be performed in order to prevent excessive hot water from flying out and coming into touch with your skin.
  • Due to the possibility of pressure build-up when removing the purge port valve covers, it is critical to ensure that the hot water valve is completely and correctly switched off for safety reasons.
  • Using gentle pressure, gently tighten each cap to ensure the rubber washer sealing discs remain in place, which are required for your valves to operate correctly.
  • 4 Connect each of the three valves with one of your hosing lines. If the manufacturer of your tankless water heater did not supply you with hosing lines, you may get them from any retail outlet that specializes in home repair or water heaters. If you have any questions, contact the manufacturer of your tankless water heater. There must be enough length in the hosing lines to allow them to reach between the water heater and your bucket
  • It is possible that you will need to reference your tankless water heater’s owner’s handbook or contact the manufacturer directly for specific instructions on how to do this operation.
  • Depending on your situation, you may be required to utilize a sump pump and attach hoses to the tankless water heater’s cold and hot water valves in order to discharge and flush the water from the tankless water heater.
  • 5Open the purge port valves by twisting them in a direction perpendicular to the position of the cold and hot control valves.
  • 6 You should always use undiluted white vinegar instead of chemical solutions to clean your tankless water heater, rather than the recommended 2.5 gallons (9.46 liters). In addition, because your tankless water heater is most likely the source of all of your drinking and bathing water, employing chemical cleaning solutions might have a negative impact on the quality of your water.

7 Follow the manufacturer’s instructions for cleaning and emptying your tankless water heater to ensure that it is properly maintained. It is possible that this treatment will take up to 45 minutes.

  • 8After the flushing operation has been finished, close the purge port valves by twisting the ″T″-shaped handles to the closed position.
  • Connect and remove the hosing lines from each water valve, then reconnect them.
  • 10 Attach the purge port valve caps to the purge valves using the hose clamps.
  • Make sure to tighten the caps completely and firmly without damaging the rubber sealing discs that are placed within the caps.

11 For specific instructions on how to properly re-start your tankless water heater, consult the manufacturer’s handbook for your particular model. Simply rotating and opening the cold and hot water valves such that they are parallel to the position of the main valve that leads into your home may be sufficient for this operation.

  • 12 Slowly turn on the hot water faucet in your sink to let the water to travel through the pipe and cool the water. The water should be left running until it is running consistently and without any air leaving
  • this technique might take up to 2 or 3 minutes.
  • Question Add a new question Question What should I do if there is a leak in the plumbing and steam is escaping while the hot water is being used? Your heat exchanger has developed a crack and will require replacement. You can purchase only that component or you can replace the entire tankless heater. It is less expensive (in terms of components) to replace a single component
  • however, I rebuilt the entire device since water had seeped into the circuitry, and who knows when that might cause another failure. Is it necessary to perform this procedure even if I have a water softener? Yes, since it’s critical to keep a tankless water heater in good working order. The heating components get very hot, causing calcium and other deposits to bake onto the heating units in a short period of time. Even if the water is from a clean municipal source, it should be filtered. A tankless heater’s life duration is significantly reduced if it is not properly maintained. They’re a highly delicate piece of machinery that requires constant attention and maintenance. Install a filter before the heater and clean it twice a year to ensure that it has a long service life. It is absolutely necessary. You’re more concerned with clearing baked-on crap off the heating element than with cleaning dirt or debris. How long can I keep and reuse white vinegar after cleansing a Rinnai tankless water heater with it? Can I store and utilize the vinegar again? No, because the utilized vinegar contains dissolved particulates, it is no longer considered ″virgin.″ Always discard the old vinegar and replace it with new vinegar before flushing the toilet.

More information can be found in the following answers: Advertisement


Make sure you have all of the tools and equipment necessary to flush and drain your tankless water heater by consulting the manufacturer’s instructions for your particular model of tankless water heater.

Thank you for submitting a suggestion for consideration! Advertisement Caution should be exercised if you have used hot water just before doing this process since the water may be too hot while manipulating the purge port valves during the procedure.


Things You’ll Need

  • The following items are required: a sump pump or a utility pump
  • 2.5 gallons (9.46 liters) undiluted white vinegar
  • a 5-gallon (18.92 liter) bucket
  • three hosing lines (the number of lines may vary depending on the manufacturer)

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How to Flush a Tankless Water Heater (Step-by-Step Procedure)

Please keep in mind that this content may contain affiliate links.This means that, at no additional cost to you, we may gain a small profit on purchases made via our links.Knowing how to properly clean a tankless water heater will help you get the most out of your investment in terms of efficiency and durability as possible.Consider the following steps in detail, as well as some helpful tools and crucial considerations.

The Importance of Flushing Tankless Models

Tankless water heaters are less expensive and more energy efficient to operate when compared to standard water heaters.They also demand significantly less maintenance and operating area.Therefore, it is critical to understand why and when a tankless water heater should be flushed, as well as how to flush a tankless water heater, whether it is gas or electric.Examine how the naturally existing sediment in your water impacts the heater, as well as how to make flushing more convenient and safer.

Tankless Water Heaters and Scale Buildup

Anyone who has ever had a conventional water tank is aware with the necessity of flushing the tank on a regular basis in order to remove silt from the system.Tankless heaters are not an exception to this rule.Hard water includes minerals that can cause lime scale to build up on the surface of the water.An explosion from the accumulation is less likely to occur with a tankless heater than it is with a standard tank model, but it can still cause some expensive complications.The heat exchanger is particularly susceptible to scale buildup.

As lime deposits accumulate in the unit, the heat exchanger is forced to work harder and more often in order to deliver hot water.This can result in a considerable reduction in the lifespan of this component, as well as a large rise in your electricity expenditures over time.To make matters worse, most warranties do not cover the effects of lime accumulation.

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How Often Should You Flush a Tankless Water Heater?

Tankless water heaters should be cleansed at least once a year to ensure that they operate at peak performance levels. However, the hardness of your water plays a role in this, and if your home’s water is very low in quality, you may find it necessary to flush two to three times a year. To a certain extent, a sediment trap or a water softener can help with hard water.

Isolation Valves

It is critical that we explain isolation valves before proceeding with the rest of the processes.As the name implies, an isolation valve allows you to isolate (isolate) a segment of your pipeline’s liquid or gas supply without having to shut down the entire supply line (as would otherwise be the case).Essentially, the word is equivalent with the term ″shut-off valve.″ From your stove to your toilet, a wide range of objects in your home are equipped with some type of isolation valve for maintenance or emergency purposes, depending on the item.These valves are available in a variety of designs, but they all fall into two fundamental categories: those that move in a rotational direction (such as a ball or butterfly valve) and those that move in a linear direction (ex: glove or diaphragm valves).In some cases, depending on the manufacturer and if a professional installed your tankless heater, an isolation valve may or may not be put on your tankless heating system.

If your heater does not have this function, we highly advise you to get one installed as soon as possible and to engage a professional to flush the system while you wait, since it may be a significant safety issue while doing a flush or other maintenance tasks.

Using Pumps and Flush Kits

A submersible pump is one of your greatest friends when it comes to flushing a tankless water heater.Due to the fact that you do not have enormous volumes of water to sweep up and drag the sediment out, a quality pump such as the 91250 from Superior Pump will save you hours, if not days, of manual flushing time.Flushing will necessitate the use of a large bucket to contain the pump, since there is no easy drainage option available, as there is with a typical tank model, necessitating the use of a submersible model pump.A decent flush kit is yet another useful piece of equipment.These kits often include everything you’ll need, including a pump, bucket, descaler, and hoses, among other things.

When you own a tankless heater, having a maintenance kit on hand might be a fantastic investment, even if it is not strictly essential.My favorite kit is made by My PlumbingStuff, and it not only works well and is simple to use, but it is also ecologically friendly down to the last component, making it the greatest tankless water heater flush kit in my opinion.

How to Flush a Gas Tankless Water Heater

  • Consult your water heater’s instruction manual for precise directions on how to cleanse and descale the unit. Rinnai, Rheem, and Noritz are the three most popular manufacturers of gas tankless versions. For your convenience, we’ve included particular guidelines for each of the brands listed below: Procedures for flushing a Rinnai tankless water heater, a Rheem tankless water heater, and a Notritz tankless water heater are all available online.

No matter what type of gas tankless water heater you have, there are a few steps in the flushing process that must be completed in the proper order, but they are all rather straightforward to complete.

Phase 1: Preparation

  1. Disconnect the electrical power source that is feeding the heater.
  2. Remove the access panel and check the terminal with a non-contact voltage tester to ensure that there is no longer any power coming through it.
  3. Discover where the gas isolation valve is located and close it.
  4. To prevent any water from entering the unit while you are working, locate the hot and cold shut-off valves and close them accordingly:
  5. To release any pressure, locate the hot water pressure relief valve, which should be located somewhere along the hot water line. Take cautious, because the hot water will be quite hot
  6. The service port for cold water and the service port for hot water will be separate. Hoses should be connected to both of these ports.
  7. Fill a five-gallon bucket halfway with water and submerge your submersible pump.
  8. The cold water pipe should be connected to your pump.
  9. Into the bucket, insert the free end of the hot water line
  10. Pour four gallons of undiluted virgin food-grade white vinegar into a pail and set it aside. (Note: As a heavy-duty alternative, Noritz recommends mixing one gallon of CLR with three gallons of water.

Phase 2: Flushing

  1. Make sure that the hot and cold service ports are open and that the pump is running.
  2. Make sure the vinegar is allowed to flow through the heater for at least one hour (longer if the pump runs at less than four gallons per minute). As a result of this, the scale is broken down and the silt is flushed away.
  3. Turn off the pump and empty the vinegar into a trash can.
  4. Close the cold water service port and disconnect the hose that is connected to it.
  5. Open the cold water shutoff valve to let any residual vinegar to be flushed out through the second hose into your bucket for around ten minutes.
  6. Close the cold water shut-off valve on your faucet.
  7. Allow the water to drain completely before disconnecting the second hose.
  8. Close the hot water service port on the boiler.
  9. Remove the cold water intake filter as well as the hot water inline filter (if applicable).
  10. Remove any retained sediment by flushing the filters with water in a sink.

Phase 3: Cleanup

  1. Reinstall the filter(s) in a secure manner, and then turn off the hot and cold water valves
  2. Replace the access panel
  3. turn on the gas shutoff valve
  4. and remove the access panel.
  5. The electrical supply should be reconnected.

How to Flush an Electric Tankless Water Heater

  • Flushing out an electric tankless water heater is a little different than cleaning out a gas tankless water heater, and some disassembly may be necessary. Generally speaking, Navien models are easier to understand, however some Takagi models require additional steps in order to properly place the water control valve. Technique for flushing a Navien tankless water heater
  • procedure for flushing a Takagi tankless water heater

Descaling an electric model is similar to descaling a gas model in that it may be divided into three stages.

Phase 1: Preparation

  1. Switching off the electrical power at the circuit breaker
  2. Close the cold water shut-off valve on your faucet.
  3. Open your taps to let any water that has accumulated in the heater to drain
  4. Close the shut-off valve for the hot water supply.
  5. Remove the access panel and check the terminal with a non-contact voltage tester to ensure that there is no longer any power coming through it.
  6. Disconnect the wires from the heating elements by removing the screws that hold them in place.
  7. Extraction of the heating element is accomplished by loosening the hexagonal brass top of the heating element in a counterclockwise manner
  8. Make a visual inspection of the heating components for evidence of damage. A broken element should be replaced as soon as possible.
  9. Storage of the heating elements in the cooper chambers of the heater to allow for cleaning of the heating elements

Phase 2: Flushing

  1. Fill the cooper chambers with virgin food-grade white vinegar that has not been diluted
  2. Pour vinegar into the chamber and allow it to rest for 90 minutes to two hours. Using this method, you may break up any scales on the components.
  3. Remove the vinegar from the mixture.
  4. Replace the heating elements and reattach the cables as necessary.
  5. Open the cold water shut-off valve and let the tank to fill up with cold water
  6. Observe the tank for any evidence of leakage (the paper towel test is quite effective in this situation)
  7. To turn off the hot water, turn the shutoff valve.
  8. Fill the sink with warm water from various hot water taps and let the water run for about five minutes to flush out the vinegar and remove any air pockets from the line

Phase 3: Cleanup

  1. Turn off all hot water faucets in your home.
  2. Close the cold water shut-off valve on your faucet.
  3. Clean any dirt from the cold water input filter by flushing the filter under a cold water faucet.
  4. Replace the filter in a secure manner.
  5. Power should be restored at the breaker once you close the access panel

How to Flush a Tankless Water Heater in 7 Simple Steps

Have you noticed that your tankless water heater is no longer providing you with hot water?Did you notice a decrease in the amount of water that was flowing from your water heater as well?If you understand how to flush a tankless water heater, you can take care of these problems.Hard water minerals can accumulate on the heating elements and other components of the water heater, lowering the efficiency with which the water is heated.Tankless water heater manufacturers recommend flushing and cleaning your tankless hot water heater at least once a year, which is why you should do so.

Additionally, you may learn more about water heaters that are specifically built for hard water by visiting this page.This post will show you how to flush your tankless water heater and maintain it operating at peak performance.

Things You Need for This Tutorial

The process of flushing a tankless water heater is not difficult if you prepare the necessary supplies before beginning the real process. Here is a list of the supplies you will need to clean a tankless water heater:

Owner’s Manual

When it comes to cleaning and flushing their equipment, tankless water heater manufacturers offer specific suggestions.They also have preferences when it comes to the cleaning solution that may be used on the water heating system.I recommend that you read the maintenance recommendations in your handbook before flushing the device.Also included are the tools required for such an activity as well as the safety considerations that must be adhered to during the process.

Cleaning Solution

When it comes to cleaning the tankless water heater, several manufacturers only advocate pure, undiluted, virgin, and food-grade white vinegar as a solution.This vinegar-based product eliminates mineral deposits and limescale accumulation without endangering the health of your family.Some tankless water heater manufacturers, on the other hand, advocate using a specialized cleaning for their products.Because of this, it is always a good idea to consult the owner’s handbook for detailed instructions and suggestions.

Other Tools

For a gas tankless water heater, you’ll need a big bucket, a submersible pump, and water hoses to connect the water heater’s service ports to your home’s plumbing system.The use of a screwdriver is also required for opening and shutting the access panel on the water heater.Additionally, a non-contact voltage detector will be useful in confirming that your water heater is entirely turned off before cleaning it.

Steps for Flushing a Tankless Water Heater

Step 1. Read the manual.

The cleaning technique for tankless water heater systems differs from manufacturer to manufacturer.For example, Rinnai may have a different technique of cleaning its tankless water heaters than Rheem or other models, and this may differ from other brands.As a result, I always recommend consulting the owner’s handbook for precise cleaning recommendations pertaining to the device you wish to clean before beginning.

Step 2. Disconnect the tankless water heater from its power source.

Contrary to popular belief, even a gas tankless water heater includes an electrical connection that powers the electronic components within the unit’s construction.Because of this, I recommend that you unplug the gadget from the electrical outlet.It would be better if the tankless water heater’s power source was disconnected from the circuit breaker panel before continuing.This technique is for an electric tankless water heater, which you will be installing.Make sure the electrical current in your system is safe by opening the access panel and using a non-contact voltage tester to examine it.

When it comes to determining whether or not voltage is present in a water heater, the Fluke 1AC-A1-II VoltAlert is a dependable instrument that homeowners may utilize.

Step 3. Close the gas valve, the water supply line, and drain the water.

Locate and turn off the water shutoff valves on the tankless water heater if necessary.It is recommended that you close the shutdown valve on the main water supply line if your device does not have these measures.If you have a gas tankless water heater, I also recommend that you close the gas isolation valve on the water heater before turning off the water supply.Open all of the faucets in order to drain the water from the supply line.In addition, I recommend that you carefully open the hot water pressure release mechanism in order to alleviate pressure from the system.

Step 4. Prepare the tankless water heater.

If you have a gas tankless water heater, you may be able to skip this step.Remove the heating elements from the electric water heater by releasing the screws that hold the wires in place and unscrewing the hexagonal brass cap from the element.Cracks and other symptoms of deterioration should be looked for on the water heater components.After you have cleaned your tankless water heater, you may replace the heating element with a new one.It is possible to clean the water heater components in the copper heating chamber if they are placed in the chamber.

Step 5. Set up the flushing system.

The cold and hot water service ports on the tankless water heater should be located, and the flexible tubings should be connected to both.Get a huge bucket and put a submersible pump in the center of the bucket.Afterwards, connect the cold water line to the pump.The free end of the hot water line should be placed in the container or bucket.Fill it with four gallons of a tankless water heater cleaner or four gallons of pure, food-grade, virgin white vinegar, if needed.

Some water producers give suggestions for descalers or cleaners, although the majority do not.The majority of corporations, on the other hand, solely prescribe white vinegar.Open the copper heating chamber and fill it with pure, food-grade virgin white vinegar before putting it back together.

  • You may also use a tankless water heater descaling solution that is recommended by the manufacturer.

Step 6. Flush the tankless water heater.

Open the cold and hot water service ports on the tankless water heater, and then turn on the submersible pump to complete the installation.Allow at least an hour for the white vinegar or cleanser to circulate throughout the system.It’s possible that the water from cleansing the tankless water heater with vinegar becomes blue after a while.The fact that the solution contains dissolved copper oxide from your tankless water heater should not be a reason for concern.Turn off the water pump and empty the cleaning or vinegar solution from the tankless water heater to prevent it from overheating.

In order to proceed, switch off the cold water service port and disconnect the tubing from the pump.Allow at least 10 minutes to pass after turning on the supply line’s shutdown valve to drain out any residual vinegar or cleanser.Close the valve and continue to drain the water until the water is completely gone.

  • Disconnect the hot water supply line from the service port and remove the tubing.
  • Check the cold water input first, and then the hot water supply pipe to see whether there is a filter.
  • Remove these filters and thoroughly clean them in the sink, making sure there are no sediments or debris left behind.
  • Make sure the white vinegar or cleanser has been sitting in the copper heating chamber for at least 90 minutes before using it.
  • However, most experts recommend that you wait two hours to verify that any limescale and mineral deposits on the heating components have been completely dissolved.
  • It is necessary to replace the water heater elements as well as reattach the electrical lines.
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After that, open the shutdown valve on the cold water line to allow water to flow into the heating chamber.Afterward, open the hot waterline shutdown mechanism as well as all of the faucets in your home once a few minutes have passed.Continually run the water for five to ten minutes, or until there is no longer any scent of vinegar or cleaner coming from the faucet.In addition, air is removed from your water line as a result of this procedure.

Step 7. Finish up.

Before opening the shutdown valves for the cold and hot water lines, make sure the filters are properly installed and secured to the hot water line and cold water input.Reinstall the access panel and fasten it with screws to keep it in place.Turn on the gas supply line’s shutdown valve and reconnect the heating unit to the electrical outlet, if it has been disconnected.Alternatively, you can switch on the electricity at the circuit breaker panel.Close all faucets and turn off the cold water valve to prevent water from leaking.

Remove and thoroughly clean the cold water supply input filter to verify that no debris is left behind before reinstalling the filter.At the circuit breaker panel, secure the access panel and turn on your water heater to begin using it.Silver Cymbal’s video on cleaning and flushing tankless water heaters is really helpful, and I recommend it.

  • I recommend that you take the time to view the five-minute video.


Using vinegar or a suitable cleaning/descaling solution in the heating chamber or a bucket is all it takes to flush a tankless water heater, which is simple and straightforward.The final step in the tankless water heater cleansing process is to allow the solution to settle for several minutes before dumping the cleaner into the sink.I hope you enjoyed this lesson and will spread the word about it to your friends and colleagues.You may also send me questions or comments on this guide, and I would be pleased to respond to you and share my ideas on the subject.

How do I flush clean my Rinnai tankless water heater? (R)

  • It is possible for a tankless water heater to accumulate mineral build-up over time, which can corrode the walls of the heating chamber within the tank. For proper maintenance and cleaning of your tankless water heater, it is necessary to flush those mineral deposits out at least once a year with a hose. Follow this straightforward procedure to guarantee that your tankless water heater performs and operates at peak efficiency. Please take the time to read through all of the instructions before starting, as you’ll want to ensure that you have all of the necessary supplies on hand for the process. Remove the tankless water heater’s power supply by following these steps: 1. 2. Turn off the main gas valve or the circuit breaker for any electrical equipment that are not in use. 3. Turn off (close) the three water valves that are connected to your tankless water heater. 4. During the cleaning procedure, this stops cold water from entering the water heater and hot water from exiting the water heater.
  • The water valves are comprised of three parts: a cold water valve (which is colored blue), a hot water valve (which is colored red), and a main valve, which is responsible for bringing water into your home.
  • 4. Remove the purge port valve caps from the purge valves situated on each of the cold and hot water valves one at a time, taking care not to damage them. The purge valves are distinguished by their little handles that mimic the letter ″T.″
  • In order to alleviate any pressure that has built up inside the valves and to avoid excessive hot water from pouring out during the cleaning process, this step must be carried out.
  • Because there may be pressure when removing the purge port valve covers, it is critical to double-check that the hot water valve has been properly switched off for your safety.
  • Make sure to handle each cap with care to ensure that the rubber sealing discs remain in place. These are required in order for your valves to operate correctly.
  • 5. Connect a hosing line to each of the three valves in the system. Tankless water heater hosing lines are available at any home improvement store that carries water heaters if the manufacturer did not include them with your tankless water heater. There must be adequate length between the water heater and the bucket for the hosing lines to be effective.
  • Please refer to the tankless water heater manufacturer’s instruction manual, or contact the manufacturer directly if you require specific instructions on how to do this step.
  • In certain situations, you may be required to utilize a sump pump and connect hoses in order to discharge and flush water from the tankless water heater’s cold and hot water valves during this operation.

6.Twist the purge port valves so that they are perpendicular to the positions of the cold and hot valves, and then close them.7.To clean your tankless water heater, fill a 4-gallon (15.1-liter) bucket halfway with undiluted white vinegar.Never apply any type of chemical solution on your skin.

Using chemical cleaning solutions in your house might be particularly damaging to your health because the majority of the water used for drinking and bathing is likely to pass via your tankless water heater.

8. To complete the flushing and draining operation, according to the directions provided in your manufacturer’s handbook. It is possible that this treatment will take up to 45 minutes.

9: When the flushing operation is finished, shut the purge port valves by twisting the T-shaped handles.10.Disconnect and remove the hosing wires from each of the valves in the sequence listed.11.Attach the purge port valve caps to the purge valves using the hose clamps.

Tighten the caps all the way down and securely.Take care not to overtighten the caps, as this might cause the rubber sealing discs within to crack or shatter.

12. Refer to your water heater’s owner’s handbook for specific advice on how to properly restart the unit. It may be necessary to rotate and open the cold and hot water valves such that they are parallel to the position of the main valve in order to achieve this result.

Pick a sink tap within the house and turn on the hot water gently, allowing enough time for air to travel through the pipe. Make sure to keep the water running until it flows consistently and there is no air escaping (you may recognize this by a slight sputtering sound). Depending on the size of the air pockets, it might take up to 2 or 3 minutes for them to all to escape.

How to Descale A Noritz Tankless Water Heater (Demo)

  • How to Descale a Noritz Tankless Water Heater | HomeBlogHow to Descale a Noritz Tankless Water Heater (Demo) All water heaters, whether they are storage tank or tankless, will unavoidably accumulate scale deposits over time, which can reduce their overall working efficiency and reduce their lifespan. The pace at which scale accumulates is dependent on the hardness of the water in a specific geographic location, but it is certain that any unit will require descalement at some point. You will learn how to descale a Noritz tankless water heater from the information in this blog. In order to do this, Noritz has developed a straightforward descaling process, which is shown below. Although it is feasible for intelligent homeowners to complete this task on their own, a plumbing professional should be called in if there is any hesitancy on their part. View our video on How to Descale a Noritz Heater for a more visual description of the process. This is what you will need: a five-gallon bucket
  • three to four gallons of distilled, food-grade white vinegar
  • two 34 inch connecting drain hoses
  • a submersible pump
  • and some elbow grease to descale your tankless water heater.

Descaling a Noritz tankless water heater

Before you begin, keep in mind that the red isolator valve on the unit denotes the hot water side, and the blue isolator valve represents the cold water side.Drain caps are situated on the top of the hot side and on the left of the cold side of the refrigerator, respectively.When the valves are turned to the vertical position, it signifies that they are ″on″ and that water is flowing freely.When the valves are turned to the perpendicular position, they are said to be ″off.″ 1.Leave the device turned on, but turn off the gas valve.

2.Turn off the hot and cold valves at the same time.Drain caps should be removed from both valves.

  • Place the five-gallon bucket beneath the hot water side of the faucet.
  • Make sure the red drain valve is turned to the ″on″ position before using the bucket to drain the excess water that has accumulated within the device.
  • 3.
  • Repeat step two on the other side of the sink with cold water.
  • 4.
  • Attach a hose to the submersible pump and place the pump and hose into a five-gallon bucket to collect the water.

Make sure the power wire does not become tangled in the bucket.The pump output line should be connected to the cold water drain valve.5.Drain the hot water by connecting a drain hose to the hot water drain valve and placing one end of the drain line into a bucket.7.Fill the bucket with between three and four gallons of vinegar, making sure that the pump is completely buried.

8.Allow for at least an hour of operation by opening both drain valve lever handles on the isolation valves and starting the pump.The vinegar solution should be changed every 30 minutes and repeated many times for best efficiency.The unit will attempt to start, but will fail owing to the lack of gas in the system.After a while, an error code 11 will show, which is quite typical throughout this process.DO NOT USE THE RESET BUTTON.

  1. 8.
  2. After a minimum of one hour, switch off the pump and shut off the cold water drainage valve.
  3. Remove the hose from the cold water drain valve and reattach the cap to the drain valve outlet to complete the process.
  4. 9.
  5. Carefully remove the pump and drain hose from the bucket, and then empty the bucket of liquid.

Place the hot water drain hose back into the empty bucket and turn on the cold water main valve to ensure that the water is flowing.The heater will be flushed out with new cold water after completing this operation.At least five minutes, or until 20 gallons of water have flowed through the heater, should be spent flushing.10.For condensing systems, place a bucket underneath the unit and screw open the drain cock, which is situated directly under the water heater, to drain away any descaling material that may have accumulated in the unit.

11.To turn off the primary inflow valve, turn the knob to ″OFF.″ Remove the water filter and clean it as needed for extra maintenance; some water may leak out during this process.12.Remove any dirt from the filter by rinsing it under running water.Place the dry filter back into the port, ensuring sure it’s twisted securely by hand to keep it from falling out.

12.Close the drain valve by turning it to the ″OFF″ position.Remove the drain pipe by unscrewing it and pulling it out.Replace the drain cap and tighten it down to ensure that it does not leak.

13.Reset the main hot and cold valves to the ″ON″ position, and re-connect the gas supply to the system.To get rid of the error code 11 that appeared as a result of descaling, restart the unit by turning it off and then back on.More detailed step-by-step information on the descaling procedure may be found in this descaling tutorial.

How Often Should I Flush My Tankless Water Heater?

A hearty congratulations to everyone who has just made the conversion from a standard tank water heater to a tankless model.Tankless water heaters are more energy efficient than their tank counterparts – and while they are more expensive up front, they are less expensive in the long run due to the energy savings they create on a per-gallon basis.When it comes to water heaters, one of the most often asked questions by homeowners to Grove Heating & Cooling plumbers is whether or not they should flush their tankless water heater and, if so, how often they should do so.Fortunately, Grove knows the answer to that question and will go through in detail the preventative maintenance that should be carried out on tankless water heaters.For any queries you may have concerning your tank or tankless water heater, please don’t hesitate to contact the plumbing professionals at Grove Heating & Cooling immediately.

What Is a Tankless Water Heater?

Tankless water heaters are equipped with high-capacity burners that can swiftly heat water as it passes through the heat exchanger in the tank.These machines do not require the usage of a tank since they distribute water to the faucets on demand.Tankless systems consume up to 30 to 50 percent less energy than tank-based systems since they do not require the storage of water in a storage tank to function.Tankless water heaters are significantly smaller in size and may be attached directly to the wall.

Should I Flush My Tankless Water Heater?

The short answer is, without a doubt!Despite the fact that tankless water heaters, also known as demand-type water heaters, do not keep 40 or 50 gallons of water as traditional tanks do – which may result in substantial scaling – the inside components and pipes still require regular maintenance and cleaning to function properly.Tankless systems can become clogged with calcium, magnesium, and other minerals over time, which can impair the effectiveness of the unit and cause it to fail sooner than expected.For lengthy periods of time, mineral and sediment accumulation may produce blockages and clogged pipes, both of which can cause significant damage to your property.The heat exchanger in a tankless water heater is one of the most important components to consider.

As a result, the heat exchanger has tiny passageways that can easily become clogged by scaling, preventing sufficient water from flowing through.In order to compensate for the loss of efficiency caused by scaling, the burners must work harder to heat the water, resulting in a shorter burner life expectancy.Tankless water heaters require flushing on an annual basis, much as traditional tank units.

  • Because of the high levels of magnesium and calcium present in hard water sources, homeowners who use hard water should consider flushing and cleaning their units even more regularly, potentially every six to nine months.
  • If you have any queries, please do not hesitate to contact the plumbers at Grove.
See also:  How Long Does It Take For Hot Water Heater To Reheat?

The Benefits of Flushing a Tankless Water Heater

  • Another major advantage of demand-type water heaters is that they are almost maintenance-free and may last for up to 20 years, nearly twice as long as a tank unit. Flushing your tankless system on a regular basis will ensure that it operates at peak efficiency for the longest possible time and that your house benefits from clean water and energy savings. Maintenance on your tankless water heater will guarantee that it continues to operate at peak efficiency for many years to come. Some of the additional advantages include: lowering the frequency of maintenance
  • increasing the unit’s lifetime
  • reducing the impacts of scaling
  • preventing clogged pipes and clogs
  • increasing heating speeds
  • lowering noise levels
  • and extending the life of the equipment.

Trust Grove for Water Heater Repair and Maintenance

Cleaning your tankless water heater may be a do-it-yourself activity if you’re handy and familiar with the workings of a hot water heater; there are various internet videos and articles that describe the procedure step-by-step for doing this function.If, on the other hand, you aren’t confident in your capacity to flush a water heating system – or if you want to leave the work to a professional who will do it perfectly the first time – call Grove Heating & Cooling.Grove Heating & Cooling is the company to call for all of your water heater requirements, whether they be for maintenance, repairs, or replacement.Please contact Grove Plumbing immediately to schedule an appointment with one of our plumbers!

Common Questions We Have Answers To!

What is a tankless water heater?

Return to the top of the page A tankless hot water heater, also known as an on-demand water heater or an instant hot water heater, provides hot water on demand. They do not require the use of a storage tank since they heat the water as it travels through the device.

Why install a tankless water heater?

Tankless hot water heaters provide clients with a limitless supply of hot water at a reasonable cost. A tankless hot water heater should be installed by a registered professional plumber so that you and your family may take back-to-back showers without ever running out of hot water!

Do tankless water heaters save money?

Yes! Tankless water heaters are more cost-effective in the long term than traditional water heaters. A tankless water heater’s base price may be more than the price of a regular hot water tank, but these water heaters can be up to 34 percent more energy efficient than a traditional hot water tank and can last more than twice as long as a traditional hot water tank.

Tankless gas water heater or tankless electric water heater – which one?

Return to the top of the page This is one of the most often asked questions when it comes to water heaters. People are sometimes forced to choose between natural gas and electricity. If, on the other hand, you are given the option, there are certain things to consider.

Thermoelectric Water Heater with No Tank Gas units are designed to burn natural gas or propane, and the majority of manufacturers provide both a natural gas and a propane version of their product. The use of gas water heaters may be advantageous for big households with a high demand for hot water. These devices, on the other hand, require more maintenance and are less energy efficient.

Electric Water Heater Without a Tank Electrical water heaters are less complicated to troubleshoot and consume less energy than gas water heaters. Furthermore, electricity costs have a tendency to change less than natural gas prices.

What does it mean to winterize a tankless water heater?

Tankless water heaters must be winterized in order to function properly in cold weather.Due to the fact that most manufacturers do not cover damage caused by freezing under their warranties, they may require a little additional attention during the colder months.Learn why winterizing your tankless water heater is so important, as well as how to get your tankless water heater ready for the winter, by reading this article.

What does flushing a tankless water heater mean?

Flushing a tankless water heater is simply the process of cleaning it out using a descaling chemical, which eliminates any sediment or buildup that has accumulated.

What happens if I don’t flush out my tankless water heater?

Mineral deposits may form over time. This might result in a clog within the unit, which could prevent regular heating activity from taking place. Your hot water might also vary, causing the system to overheat and reduce its overall efficiency.

What are the benefits of flushing out a tankless water heater?

  • Reduces the likelihood of clogging: Tankless water heaters can accumulate mineral backing, which can be flushed out using a descaling chemical to reduce the likelihood of clogging
  • and
  • Noise reduction: If your tankless water heater is creating noise, it is likely that there is a buildup of sediment within the tank. If the noise goes away on its own, it is possible that the accumulation has become so hardened that water is no longer able to travel through it efficiently.
  • Acceleration of the heating process: The greater the amount of buildup in the tankless water heater, the longer it will take for the heat to move. Flushing your tankless water heater on a regular basis might help it operate at peak efficiency.
  • Equipment lifespan: By flushing out the tankless water heater with a descaling solution, you are extending the life of the tankless water heater.
  • Cost: If your tankless water heater is clogged, it makes it more difficult for the water to move through, increasing the amount of energy required to create hot water, resulting in higher costs! Flushing on a regular basis boosts water flow and has the potential to save expenditures dramatically.

How often should I have my tankless water heater flushed out?

Tankless water heaters should be cleaned out once per year to two years, depending on their age.

Why should I have my tankless water heater flushed out so regularly?

Tankless water heaters need to be cleaned out more frequently in the areas near Rochester, NY that are supplied by the Monroe County Water Authority since the water is somewhat hard.

What is hard water and how does it impact my tankless water heater?

Water hardness is a measure of the amount of minerals present in a body of water.Monroe County’s water is regarded to be somewhat hard by most standards.In one gallon of hard water, it comprises between 5.6 and 7.6 grains of calcium carbonate.Homeowners in Rochester, NY and Monroe County do not require a water softener; nonetheless, flushing out your tankless water heater with a descaling solution is extremely vital owing to the mild hardness of the water in Rochester and Monroe.

Do I need a professional for flushing out my tankless water heater?

Yes! It is always a good idea to contact a licensed professional plumber when you have a plumbing emergency.

Do I need to call a plumber near me just to have part of my tankless water heater cleaned?

Yes! If you are experiencing problems with your tankless water heater, it is possible that a specific section of it has to be cleaned. Because there are several parts to a tankless water heater, it is always recommended that you consult with a licensed professional plumber for assistance with your water heater requirements.

What brands of tankless water heaters does Pride Plumbing carry?

  • When it comes to tankless water heaters, we at Pride Plumbing of Rochester only provide the highest-efficiency models that are helpful to your house. The Navien brand of tankless water heaters is one that we sell
  • Navien tankless water heaters are energy star rated, which means that they save both energy and money over time. These tankless water heaters can also be used in conjunction with the RG&E rebate, which can result in a $200 savings! These water heaters also have a sleek appearance and are 80 percent less in size than standard tank water heaters.

Are you thinking, “who is a plumber near me that can help with my tankless water heater?”

We are here to assist you! Call (585) 271-7150 to speak with your local plumber, or use the online scheduling tool to make an appointment. Save $250 on a tankless hot water heater by using our promo code!

Easy Maintenance Tips for Tankless Water Heaters w/Photos

A little ‘how-to’ information may go a long way toward ensuring that your tankless water heaters operate at peak efficiency.As a result, not only will you save money on plumbing expenses, but you will also extend the life of your tankless water heater.You may be asking yourself right now, ‘what are some tips for keeping my tankless water heater in good working order?’ Is it necessary to do periodic maintenance on tankless water heaters?Tankless water heaters, like any other type of water heater, require periodic maintenance.When descaling a tankless water heater, it is necessary to remove limescale and other mineral deposits from the burner system located within the tankless water heater itself.

Because of hard water or the amount of hot water your household consumes, you should anticipate to do this once a year at the most.This is something that families of 1-2 persons may undertake once every 2-3 years.It is recommended that you perform this once every 3-5 years if your water is soft or if you have a water softening system installed.

  • Do you require the services of a Licensed Plumber?
  • We can assist you!
  • In your location, you may get a free estimate from plumbers that are top-rated, vetted, and licensed.
  • It is feasible to service and clean a tankless water heater without the assistance of a professional.
  • Let’s take a closer look at this in further depth further down the page.
  • Step-by-step instructions will be provided to make it simple to understand how to remove limescale and other mineral deposits from your plumbing system.

We’ll also talk about how often you should maintain your water heater and whether or not a tankless water heater is a good investment in the long run.

Do You Need to Flush Your Tankless Water Heater?

The majority of people are aware that they must flush a tank-style water heater.Most people, on the other hand, are unaware that they should also flush their tankless water heater.Yes, tankless water heaters do require flushing on a regular basis.It is necessary to flush the tankless water heater in order to eliminate limescale accumulation on the burners.Typically, flushing is required every 2 to 3 years in the majority of situations.

When flushing maintenance is necessary, tankless water heaters will automatically shut down and display an error code on the display.Minerals are transported by the water supply.The number of minerals present in the water supply has an impact on the hardness of the water in the tap.

  • The amount of minerals in the water determines how hard the water is.
  • As the water warms, the sediment separates from the water in the same way as it does in a tank-style water heater.
  • Tankless water heaters, on the other hand, do not have a tank for the silt to settle in.
  • The silt eventually collects on the burners within the tankless unit as well as on the aerators on your faucets.
  • This silt jams aerators, resulting in a reduction in water flow.
  • If you find yourself cleaning your aerators on a regular basis, it may be time to descale your tankless water heater.

For a household of four, you will most likely need to clean your tankless water heater once per year at the very least.A family of two may probably get away with flushing their tankless water heater every 18 months or so, according to the experts.The only exception is if a water softening system has been installed in the home.Because of the installation of an in-home water softening system, you may be able to get away with cleaning your water heater once every 3-5 years.Now that you’re ready to learn more about how to manage your tankless water heater, let’s get started.

How to Flush and Descale a Tankless Water Heater

It is necessary to do periodic maintenance on a tankless water heater in order for it to operate properly. These instructions will guide you through the process of flushing your tankless water heater in order to clean and remove mineral deposits from the burner system:

Supplies You Will Need:

  • 2-inch clothes washer hoses
  • channel lock pliers
  • 5-gallon bucket
  • 3-gallon bucket of pure white vinegar or descaling solution
  • sump pump

Tankless water heater flushing kit – 32-ounce is available for purchase from My User Instructions for the J.C. Whitlam FLOW32 Flow-Aide System Descaler – Zoeller 42-0007 Floor Sucker Pump – 5-Gallon Bucket – Safe to Use. This practical set comes with a 5-gallon bucket, two hoses, a descaling solution, and a sump pump, among other things.

Directions for Flushing Tankless Water Heaters:

  • Approximate time: 2-3 hours
  • Difficulty Level: Easy

Step 1: Access your tankless water heater connections

The connections under the tankless water heater may be accessed by removing the cover on top of the unit. Some tankless types may not have a cover fitted at the time of purchase.

Step 2: Verify your tankless water heater has a flushing kit installed

If the flushing valves on your tankless water heater are not there, check to see if they have been installed. Stop what you’re doing and call a qualified plumber to install them.

Step 3: turn off the gas supply

Turn off the gas feed to the tankless water heater at the main shutoff valve. It will be necessary to switch the gasoline supply such that it is ″perpendicular″ to the fuel line. It is not necessary to cut off the electricity to the electric thermostat.

Step 4: Turn off the water supply

Close the cold water supply valve, which is responsib

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