Tankless Water Heater Flush Kit 1 Qt

Everything you need to flush your tankless water heater is in one box. The Chromex tankless water heater flush kit 1 qt includes a 1/6 HP submersible pump, two 6-foot stainless steel hoses, a 5-gallon bucket with lid, an elevated pump grate, and one quart of citric acid descaling solution. Ready to use straight out of the box, no extra purchases required.

Rated 4.8 stars by thousands of homeowners and licensed plumbers across the U.S., this kit completes most residential flushes in 30 minutes or less.

What's Included in the Kit

Every component you need is in the box. Nothing extra to buy.

• 1/6 HP submersible utility pump with a 25-foot power cord for easy reach in tight utility spaces

• Two 6-foot stainless steel hoses with right-angle connectors that attach directly to your heater's service valves

• 5-gallon bucket with lid and elevated pump grate to keep the pump off the bucket floor during circulation

• 1 quart (32 fl oz) of citric acid descaling solution, biodegradable, non-corrosive, and NSF Certified to NSF/ANSI/CAN 60 for drinking water treatment chemicals

The right-angle hose design sets this kit apart. When your heater sits in a tight mechanical room or utility closet, straight hoses often won't reach the service valves cleanly. These angled connectors solve that before it becomes a problem.

Why Annual Flushing Matters

Mineral scale is the leading cause of early tankless water heater failure. Calcium, lime, and magnesium deposits accumulate inside the heat exchanger each time water flows through. That buildup restricts flow, raises energy bills, and in hard water regions like Texas, Arizona, Florida, and California, it can trigger error codes and unit failure within a few years.

The U.S. Department of Energy recommends annual maintenance to preserve efficiency in tankless systems. Rinnai and other major manufacturers include descaling as a standard maintenance requirement, and most warranties require documented annual service to remain valid.

One flush per year. This kit makes it a 30-minute job.

Compatible Water Heater Brands

This tankless water heater flush kit 1 qt works with virtually all residential and light commercial units, including:

Rinnai, Navien, Noritz, Rheem, Takagi, Tempra, Bosch, EcoSmart, Stiebel Eltron, Eccotemp, Atmor, Trutankless, Marey Power, and AO Smith.

If your unit has standard service valves, which most units installed after 2010 do, this kit connects directly. No adapters needed in the majority of installs.

For units with heavy scale buildup or in hard water regions where more solution volume is needed, see the Chromex Descaling Solutions collection for larger standalone refill options.

The Citric Acid Advantage

The included descaler uses a citric acid base, not vinegar. Citric acid breaks down calcium and limescale deposits more effectively than white vinegar, produces no strong odor during circulation, and leaves zero residue after the rinse cycle. It is fully biodegradable and NSF Certified to NSF/ANSI/CAN 60 for drinking water treatment chemicals, so your family's water supply stays safe even if trace amounts remain.

For homeowners who prefer a vinegar-based flush, see the Tankless Water Heater Flush Kit with Vinegar Solution. For professionals who supply their own descaler, a pump-and-hose-only option is also available in the complete kits collection.

Who This Kit Is For

Over thousands of verified purchases, this is Chromex Tools' most-reviewed flush kit. It works for:

• DIY homeowners completing their first or annual flush. The step-by-step instructions and complete kit remove all guesswork.

• Licensed plumbers and HVAC techs who need a reliable kit that performs on the first use, job after job.

• Property managers servicing multiple units in apartment buildings or rental properties.

Not sure which kit matches your setup? Browse the full Chromex Tankless Water Heater Maintenance collection to compare all options side by side.

Frequently Asked Questions

1. How long does a flush take with this kit?

Most residential units flush completely in 30 minutes or less. Connect the hoses to your service valves, run the pump to circulate the solution, then rinse with clean water. The included step-by-step instructions walk you through each stage.

2. How often should I flush my tankless water heater?

Once per year is the standard recommendation for most households. If you live in a hard water area such as Texas, Arizona, Florida, California, or Nevada, every six months is advisable. Check your heater manufacturer's maintenance schedule for model-specific intervals.

3. Does this kit work with my water heater brand?

This kit is compatible with Rinnai, Navien, Noritz, Rheem, Takagi, Bosch, EcoSmart, Stiebel Eltron, Eccotemp, and most other residential tankless units with standard service valves. If your older unit does not have service valves, a licensed plumber can install them before you begin.

4. Is the included descaling solution safe?

Yes. The citric acid formula is biodegradable, non-corrosive, and NSF Certified to NSF/ANSI/CAN 60 for drinking water treatment chemicals. It is safe for metal, PVC, rubber, and ABS plastic components. After a standard rinse cycle, no residue remains in the water supply.

5. What if I need more descaling solution for future flushes?

The pump, hoses, bucket, and grate are all reusable. For annual refills, order from the Chromex Descaling Solutions collection. One quart is enough for a standard residential flush.

6. Can this kit handle a unit that has not been flushed in years?

For units with heavy scale buildup, one quart may not be enough to complete a full clean on the first pass. In that case, run two consecutive flush cycles or use a higher concentration. For a complete water heater maintenance overhaul, pair this kit with a Chromex Powered Anode Rod. You can also review general maintenance guidance at PlumbingInfo.

Key Takeaways

• Complete 6-piece kit: pump, hoses, bucket, grate, and 1 qt citric acid solution included, nothing extra to buy

• Completes most residential tankless water heater flushes in 30 minutes or less

• Right-angle stainless steel hoses reach service valves in tight spaces where straight hoses fall short

• Compatible with Rinnai, Navien, Noritz, Rheem, Takagi, Bosch, and most other major brands

• Annual flushing protects your warranty and prevents costly heat exchanger damage in hard water areas

• Reusable pump and hardware; order solution refills separately for future annual flushes