A tankless water heater flush pump circulates a descaling solution through the heater to help remove mineral buildup. The most convenient choice depends on what you need in the kit: a larger bucket, included cleaner, stronger stated pump flow, or hoses designed for frequent use. Here are five complete kits, followed by the key details to check before you buy.
Table of Contents
Quick Comparison
| Product | Pump and bucket | Hoses and cleaner | Best for |
|---|---|---|---|
| 6699 Tankless Water Heater Flushing Kit | 1/6 HP; 3-gallon pail | Two 6-foot PVC hoses; cleaner not included | A straightforward kit with a compact pail |
| Chromex Tankless Water Heater Flush Kit | 1/6 HP; 5-gallon bucket and pump grate | Two PVC-coated hoses; NSF-certified descaler included | A kit with a larger bucket and included solution |
| Superior Pump 91660 Deluxe Kit | 1/6 HP; 3.5-gallon pail | Two 6-foot stainless steel hoses; descaler powder included | A higher stated flow rate and stainless steel hoses |
| DrainX Tankless Water Heater Flush Kit | 1/6 HP; 3.5-gallon bucket | Two stainless steel hoses; one gallon of descaler included | Several flushes using the included solution |
| SafeTech Tankless Water Heater Flushing Kit | 1/6 HP; screw-top bucket and pump grate | Premium braided hoses; vinegar not included | A kit with a secure lid and reusable vinegar option |
Our Picks: Best Tankless Water Heater Flush Pump reviews
6699 Flushing Kit: A Simple Setup with a Compact Pail
The 6699 kit brings together a 1/6 HP submersible pump, a 3-gallon pail, two 6-foot PVC hoses, and a bucket lid opener. You supply the cleaning liquid: the listing suggests mixing vinegar or a biodegradable cleaner with water, but neither cleaner is included.
The pump is rated for a maximum flow of 1,100 gallons per hour and a maximum head of 16.5 feet. Those are pump specifications, not a promise of the flow you will get through a connected heater. The pump also has thermal overload protection, a 10-foot power cord, and a stated maximum fluid temperature of 95°F. Follow the heater and pump instructions when choosing a solution and setting up the flush.
This is a practical pick if you want the core equipment in one package without paying for an included descaler. Its smaller pail is easier to store than the 5-gallon bucket in the Chromex kit, but it offers less capacity. Check that the supplied hose connections match your heater’s service valves before starting.
Pros:
- Includes pump, two hoses, pail, and lid opener.
- Thermal overload protection is specified for the pump.
- Compact 3-gallon pail is straightforward to store.
- Lets you choose a compatible cleaning solution separately.
Cons:
- Vinegar or descaling solution is not included.
- Its stated maximum flow and head are lower than the Superior Pump kit’s specifications.
Verdict: Choose the 6699 if you want a basic, ready-to-assemble kit and prefer to supply your own cleaner.
Chromex Flush Kit: A Larger Bucket and Included Descaler
Chromex includes a 1/6 HP pump, a 5-gallon bucket with lid, two 6-foot PVC-coated hoses, an elevated pump grate, and a liquid descaling solution. That makes it a convenient option if you would rather not source a cleaner separately. The company describes its citric-acid-based formula as NSF certified to NSF/ANSI/CAN 60 and suitable for use with most listed heater brands and common system materials.
The larger bucket gives you more room for the flushing mixture than the 3-gallon 6699 pail. The grate raises the pump off the bottom of the bucket, while the hoses are designed to connect to tankless heater valves. Before use, verify the fitting arrangement and cleaning instructions for your exact heater; brand compatibility claims do not replace the appliance manual.
The tradeoff is that this kit does not list a pump flow rate or maximum head in the supplied product details, so it is harder to compare those performance measures directly with the Superior Pump. The 5-gallon bucket also takes more storage space than smaller kits. Chromex says the kit can clean most heaters in 30 minutes or less, but actual maintenance time depends on the heater and setup.
Pros:
- Includes a 5-gallon bucket, pump grate, hoses, and descaler.
- Descaler is described as NSF-certified to NSF/ANSI/CAN 60.
- Six-foot hoses are included for connecting to heater valves.
- Product information lists compatibility with many common tankless heater brands.
Cons:
- The larger bucket needs more storage space.
- The supplied specifications do not state pump flow or maximum head.
Verdict: The Chromex is a good fit if you value a larger bucket and an included, certified descaling solution over compact storage or detailed pump-performance specifications.
Superior Pump 91660: Strong Stated Flow and Stainless Steel Hoses
The Superior Pump 91660 kit includes a 1/6 HP thermoplastic utility pump, a 3.5-gallon pail with a screw-top lid, two 6-foot stainless steel hoses, and a 7-ounce non-toxic descaler powder. Its pump is rated to move up to 1,920 gallons per hour and lift water up to 20 feet vertically. As with any pump, those maximum figures do not indicate the actual flow through a particular heater and hose setup.
The kit includes a garden hose adapter for the stainless steel hoses. The pump also has an oil-free motor, an 8-foot power cord, and a bottom screen that can be cleaned. Its listing says the pump handles solids up to 1/8 inch, though a flushing setup should still be kept clean and used according to the heater’s maintenance instructions.
Compared with the other options here, this kit stands out for its stated flow and vertical lift. It also includes less descaler by volume than DrainX, which supplies a gallon of liquid solution. The screw-top pail may be useful for storage and transport, but make sure the lid and hose arrangement work for your intended flushing setup.
Pros:
- Highest stated maximum flow and vertical lift among these five kits.
- Includes two 6-foot stainless steel hoses and a hose adapter.
- Comes with descaler powder and a screw-top pail.
- Bottom screen is designed to filter debris and can be cleaned.
Cons:
- The included descaler is a 7-ounce powder pack, not a bulk supply.
- Confirm that the included hose adapter fits your heater’s service-valve setup.
Verdict: Pick the Superior Pump kit if its stated pump capacity and stainless steel hoses matter most to you, and a smaller included descaler pack is enough for your needs.
DrainX Flush Kit: A Large Supply of Included Descaler
The DrainX kit pairs a 1/6 HP pump with a 3.5-gallon bucket, two 6-foot stainless steel hoses, instructions, a maintenance tag, and a gallon of liquid descaler. The supplied product information says the descaler is citric-acid based and provides approximately four uses. That can make this an appealing option if you expect to flush more than once and want solution on hand.
The stainless steel hoses offer a different construction from the PVC hoses in the 6699 and Chromex kits. DrainX says the kit works with many tankless heater brands and that most flushes take 30 minutes or less. Treat those as general product claims: the right procedure, time, and solution depend on the appliance instructions and how much scale is present.
One limitation is that the listing does not provide a pump flow rate or maximum head, making a direct performance comparison difficult. The 3.5-gallon bucket is larger than the 6699’s, but smaller than Chromex’s 5-gallon container. If you need to store a kit between maintenance sessions, consider whether the bucket and included gallon of solution are convenient for your space.
Pros:
- Includes a gallon of descaler described as enough for approximately four uses.
- Comes with two 6-foot stainless steel hoses.
- Includes a 3.5-gallon bucket, instructions, and maintenance tag.
- Product information names compatibility with many common heater brands.
Cons:
- Pump flow rate and maximum head are not listed in the supplied details.
- The bucket and solution take up more storage space than a minimal kit.
Verdict: Choose DrainX if having several uses of included descaler and stainless steel hoses is more important than comparing pump output specifications.
SafeTech Flushing Kit: A Screw-Top Bucket and Braided Hoses
SafeTech’s kit includes a 1/6 HP utility pump, premium braided hoses, a pump grate, a screw-top bucket, and instructions. The listing says the pump has thermal overload protection and is intended to circulate vinegar through the heater; vinegar is not included. This setup may suit you if you already use vinegar for maintenance and want a kit with a lid designed for secure storage and transport.
The grate is intended to keep debris from entering the pump, while the braided hoses are described as tear-resistant and leak-proof. Those design claims do not remove the need to inspect connections and hoses before use. As with the other kits, check that the fittings match your heater and follow the appliance manufacturer’s flushing procedure.
Unlike Chromex and DrainX, SafeTech does not include a descaling solution. Its supplied product details also do not state a flow rate, maximum head, bucket capacity, or hose length, so shoppers who need those measurements should verify them before choosing. The listing names a range of compatible brands, but you should still confirm the setup for your specific model.
Pros:
- Includes a screw-top bucket, pump grate, and instructions.
- Braided hoses are designed for durability and leak resistance.
- Pump is listed with thermal overload protection.
- Can be used with vinegar, which you supply separately.
Cons:
- Vinegar or another cleaner is not included.
- The supplied details do not state bucket capacity, hose length, or pump output.
Verdict: The SafeTech is worth considering if you want a screw-top bucket and braided hoses, but confirm its dimensions and pump specifications before ordering.
How to Choose a Tankless Water Heater Flush Pump
Check the heater’s maintenance instructions first
Before buying a kit or selecting a cleaning liquid, check your water heater’s manual. The manual is the best source for the correct flushing steps, valve setup, and approved descaling products for your model. A kit’s broad compatibility claims do not guarantee that every included fitting or solution is right for every heater.
Compare pump specifications carefully
All five kits list a 1/6 HP pump, but only some provide flow or lift figures. The 6699 lists a maximum flow of 1,100 gallons per hour and a maximum head of 16.5 feet. Superior Pump lists up to 1,920 gallons per hour and a 20-foot vertical lift. Maximum figures are not the same as the flow you will get when the pump is connected to hoses and a heater, so do not choose by those numbers alone.
Choose the bucket size and style that fits your setup
Bucket capacities range from 3 gallons for the 6699 to 5 gallons for Chromex; Superior Pump and DrainX include 3.5-gallon buckets. A larger container may give you more room for a cleaning mixture, but it also needs more storage space. A screw-top lid, included with Superior Pump and SafeTech, may be useful for storage and transport. Check the manufacturer’s directions for how the bucket should be used during flushing.
Make sure the hoses and fittings will connect
Hose material and connection details vary. Some kits include PVC or PVC-coated hoses, while Superior Pump and DrainX specify stainless steel hoses, and SafeTech describes its hoses as braided. Lengths are listed as 6 feet for the 6699, Chromex, Superior Pump, and DrainX kits. Verify the fitting type against your heater’s isolation valves, and check that the hose length gives you a workable route from the heater to the bucket.
Decide whether you want cleaner included
Chromex includes a liquid descaler described as NSF-certified to NSF/ANSI/CAN 60. Superior Pump includes 7 ounces of descaler powder, and DrainX includes a gallon of liquid descaler described as enough for approximately four uses. The 6699 and SafeTech kits require you to supply the cleaning liquid. Use only a solution approved for your heater, and follow the product instructions for mixing, circulation, and disposal.
Consider safe setup and handling
Flushing involves water, cleaning solution, hoses, and an electric pump. Set up the equipment as directed, inspect the hoses and connections, and keep electrical connections protected from water. Pay attention to any temperature limits listed for the pump; the 6699, for example, specifies a maximum fluid temperature of 95°F. If the required procedure is unclear or you are not comfortable working with the service valves, contact a qualified professional.
Frequently Asked Questions
What does a tankless water heater flush pump do?
It circulates a cleaning solution through a tankless water heater to help remove mineral scale. A typical flush kit combines a pump, hoses, and a bucket, though some kits also include descaler and setup accessories. Follow your heater’s manual for the proper procedure.
Do these kits include descaling solution?
Not all of them. Chromex includes liquid descaler, Superior Pump includes descaler powder, and DrainX includes a gallon of liquid descaler. The 6699 and SafeTech kits do not include cleaner, so you must supply a solution approved for your heater.
Can I use vinegar to flush my heater?
The 6699 and SafeTech product information mentions vinegar as an option, but the right cleaning solution depends on your heater model. Check the appliance manual before using vinegar or any other descaler, and follow its guidance on mixing and rinsing.
Do the listed pump flow rates show the flow through my heater?
No. A pump’s stated maximum flow is not a guarantee of the flow through connected hoses and a heater. Hose setup, fittings, and the heater itself affect real-world circulation. Consider pump figures as comparison points, not promised operating results.
Will these kits fit every tankless water heater?
The product listings name many compatible brands, but fit can depend on the heater’s service valves and connection type. Check your model’s manual and compare the valve fittings with the kit before you start.
How long does a tankless water heater flush take?
Flush time depends on the heater, the amount of buildup, and the manufacturer’s procedure. Chromex and DrainX say most heaters can be cleaned in 30 minutes or less, but that is not a universal guarantee. Use the timing and steps in your heater’s instructions.
Which kit is the best choice for repeated maintenance?
DrainX includes a gallon of descaler described as enough for approximately four uses, making it a straightforward choice if you want solution on hand for repeat flushes. If you prefer to select your own cleaner, consider the 6699 or SafeTech instead.
Final Recommendation
For a balanced kit with cleaner included and a larger bucket, the Chromex is a strong choice. The Superior Pump 91660 stands out for its higher stated flow and lift figures, while DrainX is appealing if you want a larger supply of descaler. Choose the 6699 for a simpler kit with a compact pail, or SafeTech if its screw-top bucket and braided hoses match your priorities. Before buying or flushing, confirm the fitting and cleaning requirements for your specific heater.
