6699 Tankless Water Heater Flushing Kit — 1/6 HP Pump, 3 Gal Pail & 2 Hoses for Descaling

The 6699 Tankless Water Heater Flushing Kit is a complete maintenance set that uses a 1/6 HP submersible pump, two hoses and a 3-gallon pail to flush and descale tankless water heaters safely and efficiently.

Routine flushing removes mineral buildup and keeps tankless units operating at designed flow and heat levels; this kit supplies the pump, fittings, hoses and bucket you need to perform a vinegar or biodegradable cleaner circulation without special tools. Everything is sized for home or light commercial tankless heaters and connects to standard isolation valves so you can run a controlled flush cycle and reduce scale accumulation that impairs efficiency.

How does this kit make flushing a tankless water heater easier?

The kit centralizes all essential components so you don’t have to source adapters or a pump separately. The submersible pump circulates cleaning solution through the heat exchanger while the supplied hoses and bucket create a closed loop for effective descaling.

• Includes 1/6 HP submersible pump with 10-foot power cord for easy placement.
• Two 6-foot, 1/2-inch PVC hoses with washers for leak-resistant connections.
• 3-gallon pail and lid for mixing and containing cleaning solution.
• Adapters to mate pump output to standard isolation valve fittings.

What are the pump’s capabilities and limits?

The pump is an energy-efficient 1/6 HP unit designed for circulating cleaning fluids rather than high-temperature water. It delivers strong flow for short-duration flushes while providing thermal overload protection for safe operation.

• Maximum flow up to 1100 GPH for quick circulation of cleaning solution.
• Maximum head 16.5 feet; suitable for most residential setups.
• Max fluid temperature 95°F — use room-temperature vinegar or recommended cleaners only.
• Motor draws approximately 1.5 amps at 115V/60Hz with built-in overload protection.

How do I use the kit step-by-step for a flush?

Prepare a 1:1 mixture of white vinegar and water or use a biodegradable descaling product per manufacturer instructions. Connect the hoses to your tankless unit’s isolation valves, place the pump and solution in the bucket, then run the pump to circulate the fluid through the system for the recommended time.

• Mix one gallon vinegar (or cleaner) with one gallon water in the 3-gallon pail.
• Attach hoses to isolation valves using supplied washers and adapters; confirm tight seals.
• Submerge pump, power on, and circulate for the interval recommended by your heater’s manufacturer.
• Rinse with clean water after descaling to remove residue before restoring normal operation.

What accessories and design details improve usability?

The kit includes practical extras to streamline maintenance and reduce hassle. A purpose-built bucket lid opener speeds access to sealed pails, and the pump’s relatively compact footprint lets you position it inside the bucket without interference.

• Ergonomic bucket lid opener with anti-slip grip and pry hook for fast, safe access.
• Compact pump dimensions (about 5.9 x 5.9 x 8.3 inches) for easy handling and storage.
• Two hose fittings and washers included for a leak-resistant setup straight out of the box.

Who is this for?

This 6699 flushing kit suits homeowners, small plumbing contractors and building maintenance teams who service tankless water heaters regularly and want a reliable, all-in-one solution. It’s optimized for residential and light-commercial units where routine descaling prolongs performance, but it’s not intended for high-temperature steam cleaning or continuous pumping applications.