800 GPD tankless reverse osmosis with 7 stages of filtration and alkaline remineralization. Fresh, pH-balanced drinking water on demand — no storage tank needed.
Treat every tap too: Complete Home System →
Priced below the ~$750 online alternative, with professional installation and a free in-home water test included.
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.
Removes heavy metals, dissolved solids and chlorine.
Seven stages of high-precision filtration remove heavy metals, dissolved solids, chlorine and other everyday contaminants. A natural coconut-shell carbon block gives a smoother, fresher taste.
Filtered on demand, never stored in a tank.
Water is filtered on demand, so it never sits in a tank. High flow means a full glass fast, every time.
One compact unit replaces a tank and canisters.
One compact unit replaces a bulky tank and a row of canisters, freeing up your cabinet.
Adds minerals back for better taste.
Adds beneficial minerals back after filtration for better taste. It is integrated into the unit, so there are fewer connections and less risk of leaks.
2 cups of pure water for every 1 drained.
Produces 2 cups of pure water for every 1 cup drained. That saves up to six times more water than standard RO systems.
Rinses the membrane automatically.
The system automatically rinses the RO membrane to clear trapped impurities and extend its life. A brief flushing sound and blinking filter lights mean it is working.
NSF/ANSI 58 certified, lead-free water path.
Tested and certified by NSF International to NSF/ANSI Standard 58, with a leak-free, lead-free water path built to NSF/ANSI 372.
Pure water at the tap, no plastic bottles.
Purified water at the tap replaces single-use bottles, cutting plastic waste and the weekly trip to the store.
More stages than a standard RO system — each one targeting specific contaminants for the purest, healthiest water possible.
Removes sand, rust, and particles
Removes chlorine, taste, and odor
Polishes water, removes VOCs
Removes 99% of dissolved solids
Final taste and odor polishing
Adds minerals, raises pH
Kills bacteria and viruses
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.
| 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 |
Filter Schedule: Sediment & carbon: 6–12 months. RO membrane: 2–3 years. Alkaline: 6–12 months.
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.
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.
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.
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.
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.
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.
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.
Same-week installation, 1-year warranty.
Filtration, softening and reverse osmosis in one install.
Classic under-sink RO with a storage tank.
Iron, sulfur, sediment, hardness and bacteria for private wells.
Catalytic carbon for chlorine and chloramine at every tap.