Tankless Reverse Osmosis System

HW800 AlkaPro 7-Stage RO

800 GPD tankless reverse osmosis with 7 stages of filtration and alkaline remineralization. Fresh, pH-balanced drinking water on demand — no storage tank needed.

Best for:
Households that want purified drinking and cooking water on demand.
Solves:
PFAS, lead, chromium-6, nitrates, fluoride and dissolved solids at the kitchen tap.
Why ours:
800 GPD tankless, NSF/ANSI 58 certified, remineralized, and installed by us.

Treat every tap too: Complete Home System →

Priced below the ~$750 online alternative, with professional installation and a free in-home water test included.

1-Year Warranty
Price Match
Same Week Install
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HW800 AlkaPro 7-Stage Tankless RO System
800 GPD · 7-Stage · Alkaline
1-Year Warranty

A Smarter Way to R.O.

Traditional RO systems store water in a tank. The HW800 AlkaPro filters on demand through seven stages, remineralizes for taste, and fits in a fraction of the space.

🔬

Filtration Down to 0.0001 Micron

Removes heavy metals, dissolved solids and chlorine.

⚡

Instant, Tankless Water

Filtered on demand, never stored in a tank.

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Saves Up to 70% Under-Sink Space

One compact unit replaces a tank and canisters.

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Built-In Alkaline Remineralization

Adds minerals back for better taste.

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2:1 Low Drain Ratio

2 cups of pure water for every 1 drained.

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Auto Flush Keeps It Fresh

Rinses the membrane automatically.

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NSF Certified, Lead-Free

NSF/ANSI 58 certified, lead-free water path.

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Goodbye, Bottled Water

Pure water at the tap, no plastic bottles.

All 7 Filtration Stages

More stages than a standard RO system — each one targeting specific contaminants for the purest, healthiest water possible.

1

Sediment Filter

Removes sand, rust, and particles

2

GAC Carbon

Removes chlorine, taste, and odor

3

Carbon Block

Polishes water, removes VOCs

4

RO Membrane

Removes 99% of dissolved solids

5

Post Carbon

Final taste and odor polishing

6

Alkaline Filter

Adds minerals, raises pH

7

UV Sterilizer

Kills bacteria and viruses

What It Removes

Lead & Mercury
Chlorine & Chloramines
Fluoride
Nitrates
Arsenic
PFOA/PFOS
Pharmaceuticals
Bacteria & Viruses

Better Than Buying Online

The Waterdrop G3P800 is the closest 800 GPD tankless RO you can order online. Our price beats it, and installation is included.

Honest Water HW800 AlkaPro Waterdrop G3P800
Price Better price, call for yours ~$750 on Amazon*
Installation Included, by our technicians Do it yourself or hire a plumber
Water test first Free in-home test Not included
Who you call Our local North Carolina team The manufacturer
Daily capacity 800 GPD 800 GPD
Tankless Yes Yes
NSF/ANSI 58 certified Yes Yes

*Amazon price for the Waterdrop G3P800 as of October 2026. Online prices change. Waterdrop is a trademark of its respective owner.

Tankless vs Traditional RO

Feature HW800 AlkaPro (7-Stage) Standard Tank RO
Storage tank None — direct flow 3–4 gallon tank
Wait time None May empty with heavy use
Daily capacity 800 gallons 50–75 gallons
Cabinet space Compact Tank + filters
Water freshness Always fresh Sits in tank
Best for High usage, large families Standard households

System Specifications

Daily Production
800 GPD
Flow Rate
0.53 GPM
Filtration Stages
7 stages
Filtration Precision
0.0001 micron
Drain Ratio
2:1 (2 cups pure per 1 drained)
Certification
NSF/ANSI 58 (TDS reduction, structural integrity)
Water Path
Lead-free, built to NSF/ANSI 372
Footprint
Up to 70% less under-sink space
Storage
Tankless — on demand
Faucet Options
Chrome, Nickel, Black, Gold
Replacement
Quick-change cartridges
Warranty
1-year warranty

Faucet Finishes Included

Chrome
Brushed Nickel
Matte Black
Brushed Gold

Filter Schedule: Sediment & carbon: 6–12 months. RO membrane: 2–3 years. Alkaline: 6–12 months.

HW800 AlkaPro RO — Common Questions

Is the HW800 AlkaPro NSF certified?

Yes. The HW800 AlkaPro is tested and certified by NSF International against NSF/ANSI Standard 58 for TDS reduction and for materials and structural integrity. Its leak-free, lead-free water path is built to NSF/ANSI 372.

How does the HW800 AlkaPro compare to buying an RO system online?

The closest system sold online is the Waterdrop G3P800, an 800 GPD tankless RO that runs about $750 on Amazon before you install it yourself or pay a plumber. Our price for the HW800 AlkaPro beats that, and it includes professional installation, a free in-home water test first, and a local North Carolina team to call afterward. Call (984) 206-3774 for your price.

Does reverse osmosis remove PFAS from North Carolina tap water?

Yes. Reverse osmosis is the most effective home technology for PFAS "forever chemicals," which EWG has found above its health guidelines in water systems across the Triangle. An RO membrane removes 95–99% of PFOA, PFOS and related compounds by forcing water through a semi-permeable membrane, which pitchers and carbon-only filters cannot match.

What's the difference between the 7-stage tankless and a standard 5-stage RO?

A standard 5-stage RO stores purified water in a 3–4 gallon pressurized tank and produces 50–75 gallons per day. The HW800 AlkaPro produces up to 800 gallons per day with no tank, so water is filtered on demand instead of sitting in storage. It also remineralizes the water for better taste and takes up to 70% less space under the sink.

How much water does the HW800 AlkaPro waste?

Very little for an RO system. Its 2:1 drain ratio produces 2 cups of pure water for every 1 cup sent to the drain, which saves up to six times more water than standard RO systems. Auto flush also keeps the membrane clean so it stays efficient.

How often do the filters need replacing?

Filters are quick-change cartridges you can swap yourself in seconds, no tools needed. Pre-filters typically last 6–12 months depending on your water, and the RO membrane lasts 2–3 years. The filter indicator lights tell you when a change is due, and we send reminders.

Where does the system install and how long does it take?

It installs under your kitchen sink and connects to the cold water line and sink drain. The dedicated RO faucet comes in chrome, brushed nickel, matte black and brushed gold. Installation typically takes 1.5–2 hours alongside a whole-house system, or 2–3 hours on its own, with all hardware and fittings included.

Ready for the Best Drinking Water in NC?

Same-week installation, 1-year warranty.

Other Drinking Water Options

Complete Home System

Complete Home System

Filtration, softening and reverse osmosis in one install.

5-Stage Reverse Osmosis

5-Stage Reverse Osmosis

Classic under-sink RO with a storage tank.

Well Water System

Well Water System

Iron, sulfur, sediment, hardness and bacteria for private wells.

Whole Home Carbon Filter

Whole Home Carbon Filter

Catalytic carbon for chlorine and chloramine at every tap.

Call (984) 206-3774