Best Tankless Water Heater Flush Kit? (2021 Review)

Last Updated On October 19, 2021
tankless water heater flush kit

Sediment buildup occurs in water heater tanks regularly, especially in areas with hard water. This sediment can lead to damage to your tankless water heater system unless you flush the water heater regularly. 

A heater flushing kit can help you get the job done yourself without the help of a plumber, but you need the most appropriate water heater flushing kit for the job. 

We filtered through the gunk online to provide a review of the top 5 best tankless water heater flush kits.

In this PlumbingNav guide, we will cover: 

  • What are tankless water heater flush kits?
  • What are the different types of electric tankless water heater flushing kits?
  • How does a tankless water heater flush kit work?
  • What do you look for in the best tankless water heater flush kit?
  • Top 5 best tankless water heater flush kits reviewed

ImageProduct
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Kelaro Tankless Water Heater Flush Kit
  • Biodegradable descaler
  • EZ-Off lid on bucket
  • Rubber hoses
  • Biodegradable descaler
  • EZ-Off lid on bucket
  • Rubber hoses
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Superior Pump 91600 Tankless Water Heater Flush Kit
  • Stainless steel hoses
  • Secure lid
  • Oil-free motor design
  • Stainless steel hoses
  • Secure lid
  • Oil-free motor design
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My Plumbing Stuff Tankless Water Heater Flush Kit
  • Biodegradable descaler included
  • 5 gallon Recycled Bucket
  • Effortless installation
  • Biodegradable descaler included
  • 5 gallon Recycled Bucket
  • Effortless installation
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Chromex Tankless Water Heater Flush Kit
  • Approved for drinking water
  • 5 gallon bucket
  • Descaler and grate included
  • Approved for drinking water
  • 5 gallon bucket
  • Descaler and grate included
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Hydro Master Tankless Water Heater Flush Kit
  • Easy to use
  • Flush in only 20 minutes!
  • Biodegradable modules
  • Easy to use
  • Flush in only 20 minutes!
  • Biodegradable modules
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Our Overall #1 Rated Pick

Updated On May 21, 2021

Kelaro Tankless Water Heater Flush Kit

info aboutIt takes less than 45 minutes to remove sediment buildup from your tankless water heater with this premium flush kit that includes a ⅛  hp pump, a 3.5 gallon bucket, and two rubber 6′ hoses, and biodegradable descaler, which contributes to an environmentally-friendly lifestyle. 

Our Top 5 Tankless Water Heater Flush Kits?

What's In This Guide?

      What Are Tankless Water Heater Flush Kits?

      Some people assume sediment only affects storage tank water heaters, but it gets into tankless water heaters, too. 

      Mineral buildup generates more quickly in areas with hard water or if the device produces excessively hot water. To remove calcium deposits and limescale, you need to flush your tankless hot water heater every 2 – 3 years.

      If you do not flush your tankless water heater, sediment buildup will start to damage the thermostat and other valves in your unit, which can cause the device to run hot. It can also impact the cost efficiency of your tankless water heater.

      However, hiring a plumber can get expensive. The average cost for professional tankless heater flush draining services is over $200 when it will only cost about $100 – $125 to do the job yourself. 

      Tankless water heater flush kits provide you with the tools to do the job. Standard kits include a pump, a bucket, and two hoses. 

      Storage tank water heaters do not require a pump, so most homeowners learn how to flush a water heater tank themselves. 

      What Are The Different Types Of Flushing Tankless Water Heater Kits?

      Tankless Water Heater Flush Kits With Descaler Solution

      Some products come with a descaler kit, a specially designed product that you mix yourself, known to clean out a water heater better than using vinegar and water. 

      The ingredients in all modern descalers adhere to federal codes for potable drinking systems and are completely safe. Some companies use biodegradable materials to keep the product as green as possible. 

      Plastic Hoses vs. Stainless Steel Hoses

      You will find adequate plastic hoses in most kits, but high-end kits may provide durable braided stainless steel hoses that last longer than plastic hoses while still offering flexibility to work in tight spaces.

      did you know tankless water heater flush kit, descaler

      How Does A Tankless Heater Flush Kit Work?

      Tankless heater flush kits work by pumping a cleaning solution through the water heater to break up any stubborn deposits before flushing water through the device until the sediment is gone. 

      Follow these tips to flush your tankless water heater:

      Step One: Turn off power and water to your water heater.

      Step Two: Clean cold water inlet.

      Step Three: Mix the descaler with water in a bucket.

      Step Four: Put the pump into the bucket.

      Step Five: Connect one hose from the pump to the drain hose and the other hose from the pump to the hot service valve.

      Step Six: Turn on the pump for the recommended amount of time.

      Step Seven: Disconnect pump and dispose of contents in bucket.

      Step Eight: Flush the water heater for 5 minutes until water runs clear.

      Step Nine: Close drain valve and open cold water valve.

      Step Ten: Restore power and verify hot water.

      What Do You Look For In The Best Tankless Water Heater Flush Kit?

      Correct Size Connections

      You need hoses that are compatible with your water heater connections. Residential water heaters use a uniform connection size of ¾”, so use that size for most residential purposes. 

      You also need to verify that the hoses will reach the necessary connections by checking the length. Most companies provide hoses between 5 – 8 ft. long. 

      Submersible ⅙ hp Electric Pump

      Most electric pumps in water heater kits can produce up to ⅙ hp, so find a kit with a ⅙ hp pump for all average to above-average residential purposes. 

      Flushing a tankless water heater can result in spills. If the water spills onto an electric pump, it can damage the pump and create a fire hazard. For safety, you want to use a submersible pump that won’t experience water damage as easily. 

      Best Tankless Water Heater Flush Kits Reviewed

      Now let’s explore our favorite units so you can decide on the perfect choice for your situation.

      Our #1 Rated Pick: Kelaro Tankless Water Heater Flush Kit

      Kelaro Tankless Water Heater Flush Kit

      Our Top Pick

      It takes less than 45 minutes to remove sediment buildup from your tankless water heater with this premium flush kit that includes a ⅛  hp pump, a 3.5-gallon bucket, and two rubber 6′ hoses, and biodegradable descaler, which contributes to an environmentally-friendly lifestyle.

      Pros

      • Biodegradable descaler
      • EZ-Off lid on bucket
      • Rubber hoses

      Cons

      • 45 minutes to flush kit
      • 3.5 gallon bucket
      • Low power ⅛ hp pump

      Our #2 Rated Pick: Superior Pump 91600 Tankless Water Heater Flush Kit

      Superior Pump 91600 Tankless Water Heater Flush Kit

      Best Budget

      Clean out your tankless water heater with this flushing kit that includes an oil-free ⅙ hp pump, 3.5 gallon bucket, two 6′ stainless steel hoses, and toxic-free descaling powder to clean out your tankless water heater. Use the convenient handle to transport the bucket easily, and rest assured the secure lid will stay shut.

      Pros

      • Stainless steel hoses
      • Secure lid
      • Oil-free motor design

      Cons

      • 30 minutes+
      • 3.5 gallon bucket
      • Thin descaler bag 

      Our #3 Rated Pick: My Plumbing Stuff Tankless Water Heater Flush Kit

      My Plumbing Stuff Tankless Water Heater Flush Kit

      Best High End

      Complete with a recycled 5 gallon bucket, heavy duty pump, two 5′ steel hoses, and non-toxic and biodegradable descaler. This product comes with everything you need to consciously remove calcium deposits from your tankless water heater.

      Pros

      • Biodegradable descaler included
      • 5 gallon Recycled Bucket
      • Effortless installation

      Cons

      • 5′ hoses
      • Expensive
      • Takes 30+ minutes

      Our #4 Rated Pick: Chromex Tankless Water Heater Flush Kit

      Chromex Tankless Water Heater Flush Kit

      Alternative

      This kit comes with a 5 gallon bucket, extra strength pump, elevated pump grate, 2 6′ hoses, and descaler. Keep the pump above water by elevating it on top of the pump grate while it flushes the unit in under 30 minutes.

      Pros

      • Approved for drinking water
      • 5 gallon bucket
      • Descaler and elevated pump grate included

      Cons

      • No locking mechanism for lid
      • Pump grate not always necessary
      • Instructions unclear at times

      Our #5 Rated Pick: Hydro Master Tankless Water Heater Flush Kit

      Hydro Master Tankless Water Heater Flush Kit

      Alternative

      Perfect for beginners, easily flush your water heater in just 20 minutes with this kit that includes a quiet UL-certified ⅙ hp pump, a 3.2 gallon bucket,and two 6′ hoses. It comes with both ¾” and 1” connections for both residential and commercial use, but you will need to buy the descaler.

      Pros

      • Easy to use
      • Flush in only 20 minutes!
      • Biodegradable modules eliminate spills

      Cons

      • Descaling solution not included
      • 3.2 gallon bucket
      • Plastic hoses 

      FAQs About Best Water Heater Flush Kit

      What do you flush a tankless water heater with?

      Vinegar or descaler mixed with water. 

      Do tankless water heaters need to be flushed?

      Yes. Flushing the water heater removes sediment buildup which can damage components, 

      What size pump do I need to flush a tankless water heater?

      For most residential purposes, you will need a ⅙ hp subversive pump. 

      How much vinegar does it take to flush a tankless water heater?

      3 gallons of vinegar for a 5-gallon bucket. 

      What is the average cost to flush a tankless water heater?

      You can do the job yourself for less than $125, but a professional will charge over $200.

      What happens if you don’t flush a tankless water heater?

      Sediment buildup can damage components, such as the thermostat and the valves. 

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      I'm passionate about all things plumbing, and love sharing tips, "how-to", and reviewing the latest products to help make your project a success!

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      Brant

      I'm passionate about all things plumbing, and love sharing tips, "how-to", and reviewing the latest products to help make your project a success!

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