Descaling kit · G green EXPERT

G green EXPERT 203651 Tankless Flush Kit

Descaling kit

Descaling kit1400

Updated October 2026

The short answer

A well-specified descaling kit for yearly or hard-water flushing.

Delivers
Descaling kit.
Watch for
Fit depends on your valves.
Suits
Yearly or hard-water flushing.
Voltage
115 V
Pump flow
1400
Dimensions (seller)
10"L x 10"W x 11.5"H
Product weight
9.7 lb
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What it delivers

The G green EXPERT 203651 Tankless Flush Kit is a flush kit for descaling a tankless heat exchanger.

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.

Pump flow, per the listing: 1400.

A flush is a yearly job on most heaters (Rinnai: at least once a year), longer and more often on hard water; the pump only has to move a few gallons a minute.

Listed details: material: Acrylonitrile Butadiene Styrene (ABS), Plastic, Stainless Steel; model: 203651; pump flow: 1400.

The listing gives dimensions of 10 in (L) x 10 in (W) x 11.5 in (H), a weight of 9.7 lb and 1/6hp utility pump, 17.64oz descaler, 3-gallon bucket, spanner, stainless steel hose in the box.

Warranty, per the listing: Protected by our 12-month manufacturer warranty with dedicated customer support to assist with product questions, troubleshooting, and warranty service.

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
  • 1400

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 number203651Retailer
MaterialAcrylonitrile Butadiene Styrene (ABS), Plastic, Stainless SteelRetailer
Dimensions (seller)10"L x 10"W x 11.5"HRetailer
Product weight9.7 lbRetailer
Voltage115 VRetailer
WarrantyProtected by our 12-month manufacturer warranty with dedicated customer support to assist with product questions, troubleshooting, and warranty service.Retailer
Pump flow1400Retailer

Rival units at this flow

More descaling and maintenance kits rated for similar demand

Full descaling and maintenance kits spec grid · Every G green EXPERT unit in the catalog

Final verdict

A well-specified descaling kit for yearly or hard-water flushing.

Buy this unit

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Prices change often; the button shows today's price.

Each button opens this exact model. We may earn a commission on tracked links; it never changes what we publish. Disclosure

Questions buyers ask

How long does a flush take with the G green EXPERT 203651 Tankless Flush Kit?
Follow your heater's manual. Rinnai's consumer guide circulates 4 gallons of white vinegar for up to about 45 minutes; its SENSEI bulletin asks for at least an hour at 3 to 4 GPM, then a five-minute rinse.