What it delivers
The DrainX DXDX-1684 Tankless Flush Kit is a flush kit for descaling a tankless heat exchanger; its listing says it fits all tankless water heaters such as Rinnai, Bosch, Noritz, Rheem, Takagi, Tempra, Na.
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.
How often: Rinnai says at least once a year, more on hard water. How long: up to about 45 minutes in its consumer guide, at least an hour at 3 to 4 GPM for its SENSEI models.
From the listing: features: Citric Acid-based Descaler Solution; material: Polyvinyl Chloride Type II; model: DXDX-1684; solution: citric acid.
The listing gives a weight of 6.01 kg and toilet tank 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 all tankless water heaters such as Rinna
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-1684 | Retailer |
|---|---|---|
| Features (seller) | Citric Acid-based Descaler Solution | Retailer |
| Product weight | 6.01 kg | Retailer |
| Material | Polyvinyl Chloride Type II | Retailer |
| Solution | citric acid | Retailer |
| Fits | all tankless water heaters such as Rinnai, Bosch, Noritz, Rheem, Takagi, Tempra, Na | 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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