Best Tankless Water Heater Flush Kit [Reviews & Buying Guide 2023]

Best Tankless Water Heater Flush KitIs your tankless water heater not working correctly? Does it need to be fixed? Are you thinking about calling your plumber? Well, wait! We’ve solutions to your problem. Keep reading to find out the best tankless water heater flush kit.

With the help of a flush kit, you can fix it yourself. All you need now is a good kit, and we’ll help you find one that will get the job done and save you money.

Water heater tanks accumulate sediment constantly, especially in places with hard water. If you don’t regularly clean your tankless water heater, this sediment might cause damage. That’s why cleaning it and using a kit is essential instead of calling the plumber every time.

For a complete home wellness upgrade, consider pairing your tankless water heater maintenance with our guide to the Best Sauna Heaters for an excellent experience.

6 Best Tankless Water Heater Flush Kits Review

Some of the top-rated tankless water heater flushing kits are included in this guide. We have tested all of them so that you can count on us. It’ll save you time and energy too.

Tankless Water Heater Flush Kits Comparison
Editor's Choice‎MyPlumbingStuff Tankless Water Heater Flushing Kit

  • Material: Recycled plastic pail

  • Dimensions: 15.3 x 14.4 x 14.4 inches

  • Weight: 14.47 pounds

‎Rheem RTG20124 Flush Kit - Tankless Gas Water Heater

  • Power Source: Gas Powered

  • Dimensions: 15.38 x 12.68 x 12.38 inches

  • Weight: 13.3 Pounds

‎Kelaro Tankless Water Heater Flushing Kit

  • Capacity: 3.5 Gallons

  • Material: Calci-Free

  • Weight: 0.54 Kilograms

‎Chromex Tankless Water Heater Flush Kit

  • Certification: NSF

  • Dimensions: 14.75 x 12 x 12 inches

  • Weight: 16.27 pounds

‎Whitlam KITC Flow Kit

  • Pattern: Flow kit

  • Dimensions: 15 x 10 x 15 inches

  • Weight: 8.6 pounds

‎Hercules 35235 Haymaker Tankless Water Heater Descaler Kit

  • Special Ingredients: Citric Acid

  • Dimensions: 12 x 12 x 10.75 inches

  • Weight: 10 pounds


MyPlumbingStuff Tankless Water Heater Flushing Kit


  • Brand: MyPlumbingStuff
  • Weight: 14.47 Pounds
  • Material: Recycled Plastic Pail

Maintaining your tankless heater has become 10x easy and better with this best flushing kit. This is our #1 pick for a tankless water heater flushing kit.

This flushing kit for tankless water heaters includes five-foot stainless steel hoses and a 32-ounce container. It comes with a   5-gallon bucket and a flooring sucker pump. The non-corrosive, non-hazardous, non-toxic, and recyclable Flow-Aide water descaler is fortified with penetration chemicals and wetting.

It removes all contaminants from the heater, including dirt, scale, rust, lime, and other deposits. It has everything you’ll need to keep your water heating system in great form. The step-by-step guidelines are simple and ideal for keeping the water heating system in good working order. The attached 5-foot SS hoses make connecting to the isolation valves simple.

It’s an excellent method to keep track of your heater without buying anything more. Despite its flaws, it seems promising, and we think it’s a nice flushing kit overall. This kit includes everything you’ll need to cleanse your water heater.


  • It is made of environmental-friendly material.
  • It comes with all the tools.
  • The descaler can easily remove the buildup.
  • It has a large bucket.
  • It has top quality pumps.
  • The hoes can be attached easily.


  • The step-by-step instructions are not properly defined.
  • You’ll have to watch videos to understand the cleaning process.

Our Verdict

This is our #1 pick for a tankless water heater flushing kit. It doesn’t rust, and it is easy to set up. It has everything you’ll need to clean your water heater. It is reasonable too. We highly recommend this.

Rheem RTG20124 Flush Kit – Tankless Gas Water Heater


  • Brand: Rheem
  • Weight: 13.3 Pounds
  • Power Source: Gas Powered

This kit might be excellent if you are searching for something simple to set up. To help you in getting started, the package includes simple instructions.

A bucket, two hoses, and a pump are also included. The bucket holds 5 gallons of cleaning solution, which is ideal for any job. Some consumers said they only needed about 2 gallons of white vinegar, and a few even said they reused it afterward.

The hoses are composed of rubber, but they easily attach to the tankless heater’s isolation valves. Some customers were dissatisfied with the rubber hoses, which they considered were similar to washing machine hoses.

The pumps will flow 7 GPM through the heater to remove scale and lime. This kit works with all tankless water heaters. It could even make your heater last longer.


  • It is easy to set up.
  • It comes with detailed instructions.
  • It is designed for white vinegar.
  • It does a great job; you won’t even need any cleansing agent.
  • The bucket can hold up to 5 gallons.


  • Overpriced rubber hoses.

Our Verdict

We recommend this easy-to-set-up and use flushing kit. It’ll make your job easier, and you can do it yourself without a plumber. It comes with all the necessary tools required for cleaning a tankless heater.

Looking to enhance your home’s water system? Check out our guide on the Best Under Sink Water Filters without Separate Faucet for pure and refreshing water, perfectly complementing your tankless water heater flush kit.

Kelaro Tankless Water Heater Flushing Kit


  • Brand: Kelaro
  • Weight: 0.54 Kg
  • Capacity: 3.5 Gallons

The Kelaro Tankless Water Heater Flushing Kit is the cheapest kit in this guide. It may be inexpensive, but it’s not cheap when it comes to removing water scaling, lime magnesium, and other water-based layers from the tankless water heater. The Kelaro flushing kit outperforms several high-end flushing kits currently on the market.

There have been a few concerns concerning the kit’s lack of power. However, we were pleased with its efficacy and would recommend this kit to anyone searching for the best DIY flushing kit on a budget.

All elements are required to quickly dissolve water scale, lime calcium, and other water-based contaminants from your tankless water heater.


  • It is economical.
  • It can easily dissolve all the deposits.
  • It is easy to use.
  • The kit includes all the necessary tools.


  • Customers complain that it is less powerful than other brands.

Our Verdict

We highly recommend this Kalero Tankless Flushing Kit. It is the most economical kit on the market. We’ve personally tried this ourselves, and it does a wonderful job. It is better than many expensive kits on the market.

Chromex Tankless Water Heater Flush Kit


  • Brand: Chromex
  • Weight: 15.97 Pounds
  • Certification: NSF

It comes with a 5-gallon bucket and a lid made of good-quality materials to ensure that it lasts a long time. It includes a 1/6 HP pump, an elevated pump grate, descaler solutions, and two PVC hoses.

When it comes to the cleaning agent, it may let you dissolve scale layers from tankless heaters and get clean, contamination-free water. Its liquid, citric-acid-based mixture is safe for various metals, latex, ABS hoses, and other materials.

Because it is non-corrosive, you can use it for moveable water heating systems. The best part about the hoses is how simple connecting them to the heater’s valve is. The package cleans the unit entirely in 30 mins or less.

There are directions on how to utilize it. You can clean the unit yourself if you follow the instructions. You can, however, engage professional help if you desire. This item comes with a one-year warranty and hassle-free returns.

Check out our guide on the Best Under Sink Water Filter for Well Water to ensure pure and refreshing drinking water at your fingertips.


  • It is certified by NSF.
  • Instructions are easy to follow.
  • It is made up of good quality material.
  • The pump is good.
  • It can be attached easily to the heater’s valve.


  • It creates a mess.
  • You’ll have to clean the kit properly.

Our Verdict

We highly recommend Chromex Tankless Water Heater Flush Kit because it is easy to use and comes with instructions. We’ve also used this flush kit, and we absolutely loved it. It is also NSF certified.

Whitlam KITC Flow Kit


  • Brand: ‎J.C. Whitlam
  • Weight: 8.6 Pounds

It is highly effective while also being non-toxic and secure to use. The solution has no odor and is far more effective than vinegar. This kit includes everything you’ll need to solubilize your heater. It also comes with a gallon of flowing aide, which is enough to flush one unit.

If you haven’t cleaned your heater in over a year, you must pick up this kit, which you may use for various tasks. You’ll get a smaller pump with it, but it can descale the machine in less than 45 minutes. It’s heavy, with a capacity of 350 gallons per hour.

You can connect two five-foot-long rubber hoses to the heater’s valves. It can also touch the bucket. The hoses in this flushing kit have a water leakage, which is its weakest feature. According to user feedback, some consumers received a kit with working hoses.

On the other hand, just a few people got one that leaked. You could use a lock to block the connection and prevent leaking. You can also tighten them by hand.


  • It is non-corrosive.
  • It is made up of biodegradable material.
  • It is certified by NSF/ ANSI 60.
  • It has a high-speed pump.


  • Customers think that you should hire a professional for this flushing kit.

Our Verdict

We 10/10 recommend Whitlam KITC Flow Kit as it includes everything you’ll need to thoroughly describe your appliance while also saving you money. It is a good flushing kit.

Hercules 35235 Haymaker Tankless Water Heater Descaler Kit


  • Brand: Herculus
  • Weight: 10.5 Pounds
  • Size: 32 oz

This flushing kit is so good it’ll not only descale the deposits but also prolong your heather’s life and performance. It’s designed to keep the device running smoothly by removing scale, rust, and other residues.

The solution removes inorganic elements that restrict pressure and flow fast and readily. Because the citric-acid-based mixture is solvent-free, it is suitable with rubber, alloys, and various other materials.

It is also exceptionally resistant to scale, rust, and sulphates, making it a fantastic all-arounder product. Because it is non-corrosive, it is suitable for water heaters. This is one of the most effective options accessible. It effectively descales the machines.

The set includes everything you need, such as the pump, a 3.5-gallon bucket, and a quart of cleaning agents. The pump is extremely strong, capable of pumping up to 550 gallons per hour. If you’re using it on a regular basis, it will extend the heater’s life.

Explore the benefits of clean and chlorine-free water with our top picks for the Best Tankless Water Heater Flush Kit, and enhance your water quality even further with the Best Water Filter For Chlorine.


  • The kit is high-quality.
  • It’ll extend heater’s life and performance.
  • It has a powerful pump.
  • Easy instructions.


  • It is pricey.
  • Hoses don’t work properly.
  • You’ll have to buy a second washer.

Our Verdict

We recommend this flushing kit. It is the perfect all-rounder. It comes with all the necessary tools. It is easy to use and can effectively remove deposits. It is non-corrosive. It’ll improve your heater’s performance and lifespan.

Buying Guide

Buying guide helps you decide what factors to consider while buying a product.

Easy to use

You must consider this as it’ll help you. Is it easy to use? Can you do it yourself? Or you’ll need to hire a professional? Well, the choice is yours. If you could afford it, let the plumber do the job, or buy an easy-to-use kit and do it yourself.


You must compare the flushing kits’ price, pros, and cons, and then decide if you should buy this or not. Also, consider a kit that comes with all the necessary tools, or else you’ll have to purchase them separately. When buying a flushing kit, make sure that it is made up of good quality material, as you don’t buy kits every day.

Read Customer Reviews

You must read the customer reviews as it’ll help you decide whether the flushing kit is worth the money or not? Nobody wants to spend money on something that doesn’t even get the job done.

Frequently Asked Questions (FAQs)

Is there a kit built specifically for my water heater?

One of the best features of tankless water heater flushing kits is that they can be used on any tankless water heater. Whether it’s a Res gas or electric water heater; you will not have to buy a separate flushing kit.

Is using a cleaning kit safe?

Sewage systems, drains, and potable water systems are all safe to use with the kits. Using a kit is absolutely safe, and doing this upkeep regularly will improve the performance of your tankless heater system.

What Happens If Your Tankless Water Heater Isn’t Flushed?

Failure to flush your tankless water heater might result in the steady accumulation of mineral deposits in the heater’s pipes, depending on the quality of your water source. This slows the flow of water through the machine and lowers its efficiency.

Also, check out our recommended Best Water Filter Straw to enhance the purity of your water supply.

Final words

There are two options for you. First is either you change your heater or second is that you buy a good flushing kit. But if you go for number one, you’ll eventually have to buy one after another as all the machines need maintenance.

We suggest you go for number two, and for that, we have added only the best tankless water heater flushing kit in this guide. We think My PlumbingStuff Tankless Water Heater Flushing Kit is the #1 kit in this guide.

It can easily remove deposits from your heater, prolong its life, and increase its performance. It is also cost-effective. You must buy this or go for any other option on this list. Your call!

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