Tankless under-sink reverse osmosis system
Under-sink RO. No tank. Faucet sold separately, from $59.
In South Florida, a licensed plumber installs it for $899 (plus tax on the equipment). Elsewhere in the US (not yet Wisconsin), we ship just the equipment for $569.
Illustration. The installed system may look different.
Equipment only, shipped to your door. No plumber, no install.
Ships in 5–10 business days by freight. If we can't ship on time, we'll email you and you can cancel for a full refund.
Covered by our Ship-only Limited Warranty: we ship you a replacement part. Read the warranty ›
Operational, maintenance, and replacement requirements are essential for the water-treatment device to perform as represented.
We can't ship to Wisconsin yet.
Florida orders: sales tax added at checkout.
How much does a tankless reverse osmosis system cost installed?
In South Florida (Miami-Dade, Broward and Palm Beach), ours is $899 installed by a licensed plumber, plus tax on the equipment, through Nov 30, 8 pm ET. The regular price is $1,200 installed.
A national water treatment brand quoted us $1,750 for its tankless RO system at our founder's Miami home (Nov 6, 2026). Ours: $899 installed. Both are tankless reverse osmosis systems with a built-in pump.
Quote written on the brand's flyer at an in-home visit, Nov 6, 2026, including installation. In-home prices vary by home and over time. Ours: HW800 tankless RO, installed by a licensed plumber in Miami-Dade, Broward and Palm Beach.
Elsewhere in the US, we ship the equipment for $569, and you or your plumber handle the install. We can't ship to Wisconsin yet.
What you get
- An under-sink reverse osmosis system that filters the water you drink and cook with.
- Faucet sold separately, from $59, in four finishes.
- Tankless: it needs a power outlet under the sink (120V).
Know this before you buy
- It filters the water at one drinking-water faucet only, not showers or other taps.
- You install it, or hire someone to. You may need a permit or a licensed plumber where you live, so check with your city or county. Follow the manual, including the air gap on drain lines. The HW800 needs a 120V outlet under the sink.
- Filter cartridges and the RO membrane are consumables. Operational, maintenance, and replacement requirements are essential for the water-treatment device to perform as represented.
- Not for private wells, commercial use, medical use, dialysis or aquariums.
Shipping, returns, warranty
- Ships in 5-10 business days. Late? We email you and you can cancel for a full refund.
- 30 days to return it, unopened, uninstalled and unused. 10% restocking fee. You pay return freight if you changed your mind.
- Warranty: 5-year electronics · 1-year media. We ship you a replacement part. Labor isn't covered: you, or your plumber, fit the replacement. Cartridges and the membrane aren't covered. Read the warranty
Want the whole house too?
Pair it with Home Base or the carbon-only filter.
FAQ
Is it tankless?
Yes. No storage tank. It needs a power outlet under the sink.
What does it filter?
The water you drink and cook with, at one drinking-water faucet. Not showers, not other taps.
Do you install it?
In South Florida (Miami-Dade, Broward and Palm Beach), yes: a licensed plumber installs it. Elsewhere in the US we ship the equipment and you or your plumber install it. We can't ship to Wisconsin yet.
How fast does it ship?
Shipped equipment ships in 5-10 business days.
Can I pay monthly?
For shipped equipment, pay by card or Affirm at checkout.
What isn't covered by the warranty?
On shipped equipment: filter cartridges and the RO membrane (consumables), installation damage, freezing, misuse and modification.
Can I return it?
Shipped equipment: 30 days from delivery, unopened, uninstalled and unused. 10% restocking fee on the HW800.