Tankless Water Heater Flush Kit – 1 Qt with Right Angle Hoses and Pump

Most tankless water heaters are not installed in open, accessible spaces. This tankless flush kit with right angle hoses and pump is built for the ones that are not – units tucked into mechanical closets, utility alcoves, and tight corners where standard straight hoses cannot reach the service valves cleanly.

The Chromex right angle flush kit includes a 1/6 HP submersible pump, two 6-foot stainless steel angled hoses, a 5-gallon bucket with lid, an elevated pump grate, and one quart of citric acid descaling solution. Same 6-piece, all-in-one format as our standard kit, built for harder-to-access installations.

The Chromex Tankless Water Heater Flush Kit is NSF Certified to NSF/ANSI/CAN 60 for drinking water treatment chemicals.

Why Right Angle Hoses Make the Difference

Standard flush kits come with straight hoses. That works fine when the heater is mounted in open wall space with clear valve access. When your unit is recessed, cornered, or installed behind other equipment, straight hoses create awkward angles, incomplete seals, and frustrating connection attempts.

The 90-degree connectors on this kit rotate the hose attachment point 90 degrees. You thread in from the side rather than straight-on, which is the natural approach when service valves face into a wall or adjacent surface. The flush process itself has not changed – the connection geometry has, and that single difference removes the most common complaint about at-home flushing jobs.

If your heater sits in a wide-open utility room with full frontal valve access, the standard Chromex Flush Kit – 1 Qt handles that install cleanly. This version is for every other situation.

What's Included

This is a complete 6-piece kit. Nothing is sold separately.

1/6 HP submersible utility pump – moves solution efficiently through the heat exchanger; sized for residential and light commercial units
Two 6-foot stainless steel right angle hoses – 90-degree connectors attach directly to service valves with side-clearance, no straight-line access required
5-gallon bucket with lid and elevated pump grate – keeps the pump elevated during solution circulation
1 quart (32 fl oz) citric acid descaling solution – biodegradable, non-corrosive, and NSF Certified to NSF/ANSI/CAN 60 for drinking water treatment chemicals

The 1/6 HP motor circulates solution at sufficient flow to dissolve calcium, lime, and magnesium scale from the heat exchanger in a single 30-minute flush cycle. For units with severe buildup or in hard water regions like Texas, Arizona, or Florida, a second flush cycle or additional solution may be needed.

Annual Flushing and Your Warranty

Scale buildup is not a cosmetic issue. Calcium and lime deposits narrow the internal passages of your heat exchanger, forcing the unit to run harder to deliver the same water temperature. That added strain reduces efficiency, raises energy bills, and shortens the lifespan of the heater over time.

The U.S. Department of Energy recommends proper installation and annual maintenance to preserve the efficiency of tankless water heaters. Both Rheem and Rinnai specify annual descaling in their maintenance documentation, and most manufacturers require documented annual service to maintain warranty coverage. 

One flush per year. This kit makes it a 30-minute job regardless of how confined the installation is.

Compatible Water Heater Brands

This kit connects to standard service valves found on virtually all residential and light commercial tankless units, including:

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

For standalone descaling solution refills when the pump and hoses are already owned, see the Chromex Tankless Water Heater Descaling Solution. For professionals who carry a preferred descaler and only need the hardware, see the Chromex Flush Kit – Pump and Hoses Only.

Who This Kit Is For

Homeowners with compact or recessed installations – any unit where frontal valve access is blocked or limited
Licensed plumbers and HVAC technicians doing work in mechanical rooms, utility closets, and multi-unit residential buildings where space is consistently tight
Property managers and maintenance techs servicing multiple units across a building where installation configurations vary

If your unit is in an open utility room with full valve clearance, browse the full Chromex Tankless Water Heater Maintenance collection to find the right fit. For a complete water heater service alongside your annual flush, pair this with the Chromex Powered Titanium Anode Rod to protect your tank from corrosion at the same time.

Frequently Asked Questions

1. What makes right angle hoses different from standard hoses?

Standard hoses connect in a straight line directly into the service valve port. Right angle hoses attach at a 90-degree angle, so the hose runs parallel to the wall or cabinet surface rather than sticking straight out. This matters when your heater is mounted close to a wall, inside a closet, or next to equipment that blocks a direct approach to the valves.

2. Does this kit work the same way as a standard flush kit?

Yes. The flushing process is identical: connect hoses to the service valves, submerge the pump in the bucket with the descaling solution, run the pump to circulate solution through the heat exchanger for 30 minutes, then flush with clean water. The only difference is the hose connector angle, which affects ease of connection, not the flush process itself.

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

Once per year is the standard recommendation for most households. In hard water regions – Texas, Arizona, Florida, California, or Nevada – every six months is advisable. Refer to your unit manufacturer's documentation for model-specific guidance.

4. Is the citric acid solution safe for my family's drinking water?

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

5. Can I reuse the pump and hoses for future flushes?

Yes. The pump, hoses, bucket, and grate are all reusable. For refill solution, order the Chromex Tankless Water Heater Descaling Solution separately. One quart is the correct amount for a standard residential flush.

6. What if my unit has never been flushed?

For heavily scaled units, one quart of solution may not clear all buildup in a single cycle. Run a second flush cycle before rinsing, or pick up an extra bottle. Units in hard water areas that have gone multiple years without service may need two full cycles to restore normal heat exchanger performance.

Key Takeaways

• Right angle connectors solve the primary challenge with tight installs: service valve access

•  Complete 6-piece kit: 1/6 HP pump, angled hoses, 5-gallon bucket with lid, elevated grate, and 1 qt citric acid solution NSF Certified to NSF/ANSI/CAN 60 for drinking water treatment chemicals

• Pump and hoses are fully reusable – stock an extra bottle of descaling solution for subsequent annual flushes

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

• Annual flushing protects your manufacturer warranty and prevents costly heat exchanger damage

• Flushes most residential units in 30 minutes or less, even in hard-to-reach installations