Best Tankless Water Heater Flush Kits: Review And Buying Guide

Buyers Guide, Tankless Water Heater

best tankless water heater flush kit
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Well, in this post, I would be walking you through some of the best tankless water heater flushing kits available on the market.

Moreover, I’ll also throw light on various parameters that shouldn’t be overlooked when it comes to buying a “value for money” flushing kit.

Lastly, I’ll respond to the queries related to flushing kits review in the “FAQs” section in order to help you make an informed buying decision.

So, without any further ado, let’s begin…

Top 3 Tankless Water Heater Flush Kit Comparison Table

Products Editor’s View Weight Hose LengthSize  Bucket Capacity
 My PlumbingstuffBest “Value for Money” Pump14.5 lbs 5′Full Size 5 gal
 J.C WhitlamBest for Multiple Use8.6 lbs 5′15″ * 10″ * 15″ 3.5 gal
 Rheem Tankless Best for Newbies13.3 lbs N/A15.4″ * 12.7″ * 12.4″ 5 gal
*check current price on Amazon by clicking the product link

What is a tankless water heater flush kit?

A flush kit is a special type of equipment that is meant for flushing a tankless water heater irrespective of whether it is an electric, propane, or natural gas model.

In layman’s term, it’s a tool that you can use for your water heater maintenance.

One of the many advantages that it comes with, is to save up a good lumpsum that you might be otherwise spending on yearly maintenance.

Without any doubt, the flow kit will help you to keep your tankless heater running smoothly in order to prevent any interruption with the water flow.

Furthermore, if you’re buying a complete kit then it will comprise of multiple accessories.

Some of the important elements of a flush kit are pump, bucket, and hose.

However, if you’re also opting for the solution then nothing better than that.

Should I buy a kit instead of buying all the items separately?

Frankly speaking, what my experience says is that you should always go with the kit rather than buying items separately.

However, if time and convenience aren’t a hurdle or constraint for you, then definitely, you can buy them separately, nothing wrong with that, indeed.

Moreover, the main problem associated with ordering them separately is that you’ll risk having all the things coming at the same time.

You can buy the items from the local store instead of an e-commerce website in case, you get a better price.

The basic requirement of flushing to a large extent depends on the locality that you’ve.

What is a tankless water heater cleaning solution?

In case, you’re a first-time buyer, then you must be inquisitive about the tankless water heater cleaning solution, right?

A descaler solution dissolves the lime build up on the heat exchanger in your tankless water heater.

Moreover, most of the solutions that we’ve reviewed so far are capable of dissolving not only rust but also other deposits that have accumulated in either your water heater or any other appliance.

Since most of the flushing solutions that we’ve reviewed so far are biodegradable so they aren’t dangerous for the environment.

Even though they are not toxic still I would request you to completely flush the mixture out of the lines after using in order to prevent your last hour misadventure.

But, don’t worry, if some residuals are left, it will not impact you adversely for sure.

Descaler can be used on:

  • Chillers
  • Ice machines
  • Humidifiers
  • Potable water lines
  • Boilers

Do I need an isolation flush valve?

In simple words, an isolation flush valve makes your life easier when it comes to flushing a tankless heater.

For example, a valve present under the sink can make your work easier by shutting off water flow to the tankless heater without any need of taking things apart.

On your part, all you need to do is to turn the lever and hoses and connect right to the lines that run in and out of the unit.

In case, you’re not using valves, then you don’t have any option but to take the lines apart and then replace them when you’re done.

Frankly speaking, without the use of a flush valve the process can become lethargic and time-consuming at the same time.

Best Tankless Water Heater Flushing Kits Review

Before I walk you through all the flushing kits that made to our list, please allow me to explain the process that we follow to shortlist the products.

In this case, the product is tankless water heater flushing kits.

First and foremost, our team of experts does the brainstorming and come up with a set of evaluation parameters.

Each parameter is assigned a certain weightage depending upon its ability to influence a buyer’s decision.

During the evaluation, each product scores certain marks across the parameters, of course, depending upon its performance.

Just for your information, the allocation of marks follows the relative scoring method.

Finally, we sum up the score and shortlists the “top ten” scorer for the review.

I hope you’re clear with the evaluation process, and if you still have any doubt then please feel free to reach out to us.

And, trust me, we would be more than happy to assist you.

Which is the best tankless water heater flushing kit on the market?

Frankly speaking, there are quite a few good brands that are known for offering idiosyncratic superlative flushing kits.

Moreover, saying one particular product as the “best” might not do justice to the rest of the high-quality offerings.

Correct me, if I’m wrong.

However, I’ll definitely disclose the winner of our evaluation process, and why we think it’s the one you should invest in.

Disclaimer: Whatever I’ve said is based on our evaluation process, client feedback, and our knowledge and experience about the product.

My PlumbingStuff – Tankless Water Heater Flushing Kit

So, here I’m with my favorite water heater flushing kit which is not only equipped with idiosyncratic superlative features but also comes at an affordable price.

Trust me, it’s a complete package in true sense, indeed.

To be honest, maintaining a tankless hot water heater is comparatively easier than a tank-styled water heater.

However, regular maintenance is needed to avoid calcium buildup and deposits of other contaminants to prevent any last hour misadventure including degrading efficiency and quality of water.

Not only that, regular maintenance can enhance the lifespan of the flushing kit as well as reduce energy consumption.

Irrespective of the tankless brand and model, the My PlumbingStuff tankless water heater flushing kit will deliver high-performance effortlessly.

On top of it, the product is not only, environment friendly but also nonhazardous, non-corrosive, non-toxic, and biodegradable descaler which makes it a preferred choice for end-users’ like me and you.

In simple words, I can affirm that My PlumbingStuff tankless flush product comprises almost everything that you might be needing to fully maintain your tankless water heater.

And, the best part is, the product comes with step-by-step easy to read instructions that will help you in expediting the process with ease.

The brand is a 4th generation family business within the plumbing industry for over 100 years, and has proved its mettle time and again.

Kelaro Tankless Water Heater Flushing Kit – Just add Vinegar Descaler

Within an epigrammatic span of time, the brand Kelaro has made its name which is a synonym of trustworthiness.

Kelaro is a pioneer in technology and has been serving customers since 2016.

Before we dive deep into the discussion, let me say bluntly, if you want your tankless heater to last for more than 20 years then you can’t compromise on its maintenance.

The good thing about this cleaning kit is that it comes with all the essential ingredients that you might be needing to maintain your tankless water heater.

In order to help you expedite the process without any hassle, the kit comes with step-by-step simple instructions.

All you need to do is to follow these steps without trying to skip any.

If any addition you’ll have to do, then it would be nothing else but your own vinegar.

I highly recommend this flush unit to the contractors and the DIY homeowners.

Whether you own Rheem, Rinnai, or any other tankless heater, the kit will serve the purpose effortlessly.

In simple words, you don’t have to worry anymore about either mineral build-up or scale build-up resulting in no more cold shower or underperformance.

The Kelaro Flush Kit is a reusable kit that can be used year after year by replacing a cleaning agent.

Lastly, for connecting to tankless isolation valves, you would be requiring 6′ color-coded hoses.

Rheem RTG20124 Flush Kit – Tankless Gas Water Heater

The descaling kit RTG20124 might seems to you a bit expensive if you’re on a shoestring budget.

However, seeing the features that the RTG20124 is equipped with, the price is justified as per my knowledge and experience.

Frankly speaking, the pump comprises of durable materials and possesses a robust construction as well, and thus, making it last longer.

The high-quality, durability, and performance of the pump is definitely one of the reasons for the high-price.

As compared to other pumps, the RTG20124 will circulate the water solution mix relatively faster making it not only energy-efficient but also time-efficient.

The 13.3 lbs Rheem RTG20124 is certified frustration-free which is definitely something that will grab your eyeballs.

In case, you’ve used Rheem tankless water heaters in the past, then you’ll definitely agree that the brand is known for its high-quality as well as high-performance.

And, you can expect the same from Rheem RTG20124 as well.

Whether you’re a newbie or a seasoned professional, the Rheem RTG20124 would definitely, be a great addition to your kitty.

And, for your information, you can use this product with not only Rheem but other tankless water heaters as well including Rinnai tankless.

With the help of 3/4 inch connections, you can easily connect it to an isolation valve.

Moreover, the hoses are sufficiently long enough to be able to reach your bucket and pump with ease.

In simple words, other than a couple of gallons of vinegar, the product is equipped with literally anything and everything that you might be looking for to flush your tankless water heater.

Hercules 35235 Haymaker Tankless Water Heater Descaler Kit

Just to end up all the speculations, here I’m with one of the most affordable yet highly efficient descaler kits available on the market, right now.

Moreover, the best part is, even though you’re on a limited budget, you can afford to buy the Hercules 35235 Haymaker.

This little beast includes pump, hoses, and Hercules Haymaker.

Irrespective of being cheap and affordable, the product is highly efficient in removing a wide range of pollutants including carbonates, sulfates, phosphates, rust, oxides.

In order to enhance your tankless heater lifespan, you need to use this product on a regular basis.

The Hercules 35235 Haymaker is citric acid-based, non-corrosive, and VOC-free.

Compatibility isn’t an issue with this little beast as it can sync well with most metal, rubber, ABS, PVC, and even CPVC materials.

The manufacture gives top priority to safety and most probably, you’ll not face any safety issues with septic systems, sewers, potable water systems.

Furthermore, the Hercules Haymaker Tankless water heater descaler kit includes almost everything that is needed to remove scale and maintain performance.

Lastly, the 10.5 lbs cleaning kit is backed by a limited warranty which clearly depicts the confidence and trust that the manufacturer has in its offering.

Eccotemp EZ-Flush System Descaler Kit with Pump and Solution

Well, the Eccotemp EZ-FLUSH System Descale Kit is definitely a one-stop solution to almost any tankless heater maintenance problem including water scale, lime, and rust deposit.

The EZ-FLUSH system is convenient to use, easy to operate and is uniquely designed to work seamlessly with tankless water heaters.

Moreover, the product uses Eccotemp Descaler which is a non-toxic concentrate, and NSF/ANSI 60 certified.

The descaler performs extremely well against the toughest build-up, and as a result, using it on a regular basis can enhance the lifespan of the tankless heater along with optimizing its efficiency.

With a built-in 350 gallons per hour pump, 2 five-foot rubber hoses, and 1 quart of Eccotemp Descaler, the product is bound to deliver high-performance along with a top-level of convenience.

The EZKIT weighs 8 lbs and comes with 60 minutes flush cycle.

Moreover, most of my clients have appreciated the customer service for their incredible support.

Some of you might find it a little pricey, but for all in one solution, I think the product is fairly priced.

Rest assured, it’s a great flushing product, and worth the investment.

J.C. Whitlam FLOW-KIT Flow-Aide System Descaler Kit

The J.C. Whitlam FLOW-KIT Flow-Aide System Descaler Kit is yet another value for money product that is known for its high-performance.

Moreover, the brand J.C. Whitlam is well-known in the plumbing industry and is serving the customers since 1990.

It goes without saying that the solution is top-notch and extremely effective.

On top of it, the product is non-toxic and safe to use.

Needless to say, it is one of the best descaler kits that we’ve reviewed so far.

If you’re using the kit on a regular basis then I don’t find any reason why it will not increase the efficiency and life expectancy of the tankless heater.

The product can be easily used with a need for expert guidance, and this makes it a preferred choice for especially newbies and first-time buyers.

Furthermore, the descaling kit includes a 3.5-gallon bucket, 350 GPH pump, 2 rubber hoses, 1 quartz flow-aide which clearly depicts that it’s a complete package.

All you need to do is to use the kit in a proper way to reap maximum benefits out of it.

So, what are you waiting for?

Chromex Tankless Water Heater Flush Kit with Certified Liquid Descaling Solution

So, here I’m with yet another high-quality flush kit that will definitely help you in enhancing your tankless heater lifespan as well as efficiency.

Moreover, the kit comes with almost everything that you might be needing for expediting your tankless water heater maintenance process.

In fact, the kit comes with a 5-gallon bucket with a lid, a 1/6 HP Pump, 2 Rubber hoses, a descaler solution, and an elevated pump grate.

It goes without saying that the Chromex tankless water heater flush kit will help you in getting rid of scale deposits if you’re expediting the maintenance process on a regular basis in a proper manner.

Like the other flush kits that we’ve reviewed so far, the Chromex flush kit is non-corrosive and safe for a potable water system.

The flush kit will help you to remove organic, inorganic, and corrosion causing buildup.

Furthermore, 6-foot hoses easily connect to tankless heater valves and are capable of cleaning most heaters in less than 30 minutes with ease.

In case, you’re a newbie and not aware of Chromex tools then let me tell you, the brand Chromex tools offer innovative solutions that simplify and improves your workflow as well as reduces the time required to complete complicated tasks.

In simple words, all the parts are of high-quality and the instructions that come with the kit are easy to follow.

Lastly, the Chromex tankless water heater flush kit is backed by a year warranty which clearly depicts the confidence and trust of the manufacturer in its offering.

Important Points

Let’s have a quick look at the top three benefits of a flush kit that will definitely, make your work easy and fruitful for sure.

Well, if you’re looking for some of the best flush kits, then make sure that the model that you’re opting for comes with a powerful pump as well as a great pump cycle.

Not only that, the flush unit must include a five-gallon tank in order to store the solution as well as a long hose.

In fact, you can’t deny the importance of the hose as it helps you to reach out to the farthest corner effortlessly.

Also, make sure that the design and the performance are as per your expectation.

Moreover, most of the flushing kits that we’ve reviewed are equipped with the technology that helps to fit into the tankless isolation valve easily.

Using a flushing kit is definitely beneficial as it will be safe to use for the internal components of the heater.

To be honest, not all the kits comes with a descaling solution, but having one would be a great choice, indeed.

Needless to say, the solution follows the safety standards and will never hamper the internal parts for sure.

Furthermore, you need to understand that it is prepared in such a way that it isn’t acidic.

And, as a result, you’ll find the heater to be safe for use once flushing is completed.

Clearing the Pipes

It’s a known fact that flushing a tankless water heater is very important for regular use.

Over a period of time, the accumulation of calcium or other minerals present in the water starts to taking place.

And, as a result, the performance starts degrading if nothing is done on time.

It would be completely wrong to say that flushing kit is the only solution.

In fact, you can save your time by hiring a plumber to do the job for you if it sounds feasible to you.

On the other hand, you’re someone like me who wants to save the money and expedite the process on its own, then a flushing kit would be a great option without any doubt for sure.

However, you need to be very careful in picking the right model for your heater.

In order to do so, you’ll have to make sure that the accessories and specifications are good enough to serve your purpose.

Lastly, in case, I’ve missed out on something then please feel free to let us know in the comment section.


In this section, I would be responding to the queries related to the tankless water heater flushing kit in order to help you make an informed buying decision.

Why do I need to flush my tankless water heater?

Well, if you won a tankless water heater, then you must be aware of the fact that flushing a tankless heater is a part of the maintenance process.

Failing to do so, might impact your tankless water heater in terms of both performance and lifespan.

I also suggest my clientele at least flush the tankless heater once a year if not more.

The probability is very high that over a period of time sulfates and rust might build-up, and as a result, performance might take a back seat.

However, if you’re not so used to flushing your tankless heater, then you can look for some alternatives such as a water softener.

How often should I flush my tankless heater?

To be honest, it depends on a lot of parameters including the quality of incoming groundwater.

However, once a year is the bare minimum to prevent loss of efficiency as well as degradation in the lifespan.

By using the flush kit, you can prevent the expenses that you’ll have to pay to the plumber if you would be availing of the service.

At the same time, if the water is very hard in your region, then my suggestion to you would be to use the flush kit twice every year.

Do electric tankless heaters need to be descaled?

Of course, you need to.

Similar to the gas and propane tankless water heaters, electric tankless heaters are also susceptible to limescale build-up as any other appliance.

Can I use vinegar to flush my tankless water heater?

Frankly speaking, using vinegar to flush your tankless water heater isn’t a bad idea at all.

In fact, it isn’t only safe to use but will also save you a good amount of money.

However, I’ll not deny the fact that sometimes they don’t perform as well as descaler solution.

Personally, I don’t like the vinegar smell as its too strong.

Vinegar will serve the purpose for you if the concentration of calcium is negligible or minimal in the water.

If you hesitate from using chemicals, then keep in mind that almost all the products that we’ve reviewed so far are biodegradable and non-toxic.

Wrapping Up the Tankless Water Heater Flushing Kit

First and foremost, I would like to thank you for being with us till the end.

Secondly, I would like to bring to your notice that we’ve done loads and loads of hard work in order to come up with this comprehensive buying guide.

And, if you liked our effort and want to appreciate us, then please feel free to share this piece of information with the ones who are in need of it.

After all, sharing is caring!

Cutting long-story-short, almost all the tankless water heater flush kits that have made to our list are of high-quality and worth the investment.

However, the word “best” is relative and not absolute so the flush kit that may be best for you might not even cater to my needs and vice-versa.

So, what I would suggest is to look for a flush kit that not only caters to your needs but also falls well within your budget.

In case, you wanna know my favorite tankless water heater then it’s none other than this one. (Check the price on Amazon)

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