Waterdrop price: reverse osmosis, countertop and whole-house systems and their filters

Waterdrop price: the short answer

The Waterdrop G3P600 tankless RO system, reverse osmosis with no storage tank, is $539.00 and the G3P800 is $999.00, as read on October 14, 2026. Those are one-time store prices for the system alone; replacement filters are extra. Sale figures that Waterdrop shows for a limited time are not quoted; this page uses store prices only.

GPD, gallons per day, rates how much the membrane makes in a day, not the flow at the tap. A 3:1 pure-to-drain ratio means one gallon goes to the drain for every three gallons of treated water.

Under-sink RO prices: G3P600, G3P800, X12 and X16

The two G3 models carry a 1-year warranty: the G3P600 is $539.00 at 600 GPD and 2:1, the G3P800 $999.00 at 800 GPD and 3:1. The X Series costs more and carries 2 years: the X12 is $1,299.00 and the X16 $1,999.00. Two lower-priced tankless models are the T4-A at $329.99 and the G5P700A at $359.99. Waterdrop G3P600 vs G3P800 sets the two G3 models side by side.

Countertop, under-sink filter and whole-house prices

• Countertop RO: the C1S is $259.00, the K19-SFK $349.00 and the A1 hot and cold dispenser $649.00. None needs an under-sink installation.
• Under-sink filters with no RO membrane: Direct Connect is $58.99 for the WD-10UA (11,000 gallons), $76.99 for the WD-15UA (19,000 gallons) and $95.99 for the WD-17UA (24,000 gallons); the TSA is $139.99.
• Whole house: the WHF2E-PC is $165.99, the WHF3T-PG $369.99 and the WHF3T-FG $419.99.

For a renter in a city apartment, the countertop route avoids drilling and plumbing changes. The C1S and K19-SFK are filled by hand and plugged in, and Waterdrop's pages say neither needs installation.

Replacement filters, Subscribe & Save and shipping

The G3P800 page lists the G3-N1CF for up to 6 months, the G3-N3CB for up to 12 months and the G3P800-N2RO for 24 months. One-time, the G3-N1CF is $29.99 and the G3P800-N2RO $139.99. On a filter subscription the G3-N1CF and G3-N3CB are $28.49 each and the G3P800-N2RO $132.99. Subscribe & Save is a discount that Waterdrop states as 5%, with free shipping on recurring orders and cancellation at any time.

Economy Shipping is free and takes 4-8 business days. Standard takes 3-6 business days and costs $5.99, free on orders over $200. Express takes 2-3 business days and costs $10.99 for a package under 9 lb. Waterdrop lists Klarna, 4 interest-free payments, and Truemed at checkout for HSA or FSA funds.

Price protection, returns and when to buy elsewhere

Price protection refunds the difference if a price drops within 30 days of purchase on Waterdrop's own store. Returns run 30 days from receipt, and you pay return shipping unless the return is for a quality issue; the Waterdrop return policy page has the fees.

For a lower-priced tank RO system, iSpring's RCC7 is $229.99 and APEC's ROES-50 is $230.99, both one-time prices. A tank system stores treated water in a tank; Waterdrop's under-sink RO systems have none. For a 600 GPD tankless unit, Express Water's Model 6 is $394.99 one-time, against $539.00 for the G3P600. The Waterdrop review weighs the fit.