What it delivers
The DrainX DXDX-2201 Tankless Flush Kit is a flush kit for descaling a tankless heat exchanger; its listing says it fits Rinnai tankless water heater systems, ideal for preventative maintenance and improved.
Hook the hoses to the heater's service valves, fill the bucket with vinegar or descaler and let the pump circulate it through the exchanger.
Rinnai's flushing guide uses 4 gallons of undiluted white vinegar and up to about 45 minutes of circulation, at least once a year; its SENSEI bulletin asks for at least an hour at 3 to 4 GPM. Other makers set their own interval.
From the listing: features: Maintenance and Cleaning Kit; model: DXDX-2201.
The listing gives bucket, filter, hoses, pump, vinegar in the box.
Right unit for this house?
Install it when
- Yearly or hard-water flushing
- Owners who flush their own heater
Look at another unit when
- Heaters whose manual calls for a different method
Strengths and trade-offs
Strengths
- Descaling kit
- Names Rinnai tankless water heater systems, id
Trade-offs
- Fit depends on your valves
Install limits
- Figures are the maker's or seller's own. Flow at a rise is our estimate from the input; gas, venting and electrical work needs a licensed professional.
Rated performance
Every figure below comes from the source shown in brackets. Where the maker doesn't state something, we say so instead of estimating.
| Model number | DXDX-2201 | Retailer |
|---|---|---|
| Features (seller) | Maintenance and Cleaning Kit | Retailer |
| Fits | Rinnai tankless water heater systems, ideal for preventative maintenance and improved | Retailer |
Rival units at this flow
More descaling and maintenance kits rated for similar demand
Final verdict
A solid descaling kit for yearly or hard-water flushing.
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