A. O. Smith Tankless Reverse Osmosis System Review: Specs, Pros and Cons
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This a o smith tankless reverse osmosis system review focuses on the A. O. Smith 800 GPD Tankless RO. It delivers high-capacity filtration without a storage tank. The unit produces 800 gallons per day. Its slim footprint measures 17.3 inches by 5.1 inches by 15.5 inches. This design fits under most sinks. It uses reverse osmosis technology certified by IAPMO to NSF/ANSI 58 and 372 standards. The system reduces total dissolved solids. You get clean water on demand. The brushed nickel finish adds a modern look. This review explains how these specs work in your kitchen.
What stands out
- 800 GPD direct flow capacity for fast water production
- Slim 17.3" x 5.1" x 15.5" tankless design saves cabinet space
- IAPMO certified to NSF/ANSI 58 and 372 standards
- Built-in leak detection with automatic shutoff and audible alarm
Who it fits
Good fit for
You should choose this system if you need high daily water volume without sacrificing under-sink storage. The 800 GPD capacity supports heavy use for drinking, cooking, and filling pitchers. The compact tankless design fits tight spaces where bulky tanks would not. If you value certified filtration and automatic safety features like leak detection, this unit meets those needs. The tool-free filter changes also suit users who want easy maintenance.
Who should skip it
You might want to look elsewhere if you prefer a faucet included in the box. This listing is available in a 'No Faucet' option, so you may need to purchase one separately. If you need a larger capacity than 800 GPD, this model may not meet your household demands. The system is designed for under-sink installation only. If you require a countertop or whole-house solution, this tankless unit is not the right fit for your setup.
Verdict: This tankless RO system offers high capacity and a small footprint for under-sink use. It suits households needing fast, certified filtration without a storage tank.
Key specs explained
800 GPD
This rating means the system produces 800 gallons of filtered water daily. You get fast flow rates for filling pitchers or cooking. High capacity suits busy households. Compare this to lower GPD models if you need quick water access without waiting for a tank to refill.
Tankless
The unit has no storage tank. This design saves space under your sink. You avoid the risk of stale water sitting in a reservoir. The slim footprint fits neatly in tight cabinets. Tankless systems are ideal for users who want continuous fresh water without bulky equipment.
NSF/ANSI 58
This certification confirms the system reduces total dissolved solids. It verifies the filtration performance meets strict safety standards. You get reliable removal of contaminants. Look for this mark to ensure the unit actually delivers clean drinking water as advertised, rather than just claiming it does.
NSF/ANSI 372
This standard ensures the product contains no lead. It guarantees the materials in contact with water are safe for human consumption. You do not need to worry about lead leaching into your drinking supply. This certification is essential for health-conscious buyers seeking safe plumbing components.
17.3 x 5.1 x 15.5 inches
These are the physical dimensions of the main unit. The slim profile allows installation in narrow under-sink cabinets. You can fit it where larger tanks would not. Check your cabinet space against these measurements to ensure a proper fit before purchasing this specific model.
Design and build details
The A. O. Smith 800 GPD Tankless RO uses a tankless design. This removes the need for a bulky storage tank under your sink. The unit measures 17.3 inches in length, 5.1 inches in width, and 15.5 inches in height. It weighs 15.8 pounds. These dimensions create a slim profile that fits neatly into tight cabinet spaces. You can save valuable room for other kitchen items. The listing notes the color is brushed nickel. This finish may help the unit blend with modern faucet hardware.
The system is built for under-sink installation. You place it directly under the counter. The compact layout reduces clutter in your kitchen. According to the listing, the design helps keep the area tidy while delivering powerful filtration. You do not need to manage a separate tank. This simplifies the overall setup. The unit connects to your existing water supply. You access filtered water through a dedicated faucet.
Maintenance is part of the build. The listing states the unit features tool-free filter changes. Front-facing indicators show when service is needed. You can monitor the system without opening the cabinet. The auto flush function supports consistent water quality. This feature runs automatically. You do not need to adjust it manually. The design focuses on ease of use. You get clean water without complex upkeep. The brushed nickel exterior requires minimal cleaning. A damp cloth is usually sufficient. This keeps the unit looking fresh. You spend less time on maintenance and more time enjoying filtered water.
Setup and everyday use details
Installation requires under-sink mounting. The compact dimensions allow it to fit neatly in most standard cabinets. You do not need to manage a separate storage tank, which simplifies the physical setup. The unit weighs 15.8 pounds, making it manageable for placement on your cabinet floor.
Daily operation relies on its 800 GPD direct flow performance. You get clean water faster than with traditional tank-based systems. This capacity supports everyday tasks like drinking, cooking, and making coffee. It also handles filling bottles or pitchers without delay. The tankless design means you access filtered water immediately upon turning on the faucet.
Maintenance is designed for ease. You can change filters without tools. Front-facing indicators guide you when service is needed. An automatic flush feature helps maintain consistent water quality over time. This routine action supports long-term performance without manual intervention.
Safety and monitoring are built into the system. A leak detection feature continuously scans for water issues. If a leak is detected, the system automatically shuts down key components. It alerts you with flashing lights and an audible alarm. This proactive approach helps prevent water damage under your sink. The unit is IAPMO certified to NSF/ANSI 58 and 372 standards. These certifications confirm it reduces TDS and meets lead-free requirements. You can trust the filtration quality for your household needs. The brushed nickel finish adds a subtle visual element to the installation.
Before You Buy This RO System
This A. O. Smith unit delivers 800 GPD without a tank. You must verify your faucet compatibility. The brushed nickel finish matches modern kitchens. Check if your cabinet has enough depth for the 17.3-inch length. The system requires a dedicated faucet. You cannot use an existing kitchen tap. Maintenance involves tool-free filter changes. Front-facing indicators signal when to replace filters. The auto-flush feature helps maintain consistent quality. You should plan for annual filter replacements. This model suits homes needing high daily output. It fits well if you dislike bulky tanks. Compare its slim profile against other tankless options. Ensure your water pressure meets the manufacturer’s minimum. The leak detection system adds peace of mind. You need basic plumbing skills for under-sink installation. The 15.8-pound weight is manageable for most users. Consider the noise level if your kitchen is open. This system integrates easily into standard under-sink layouts.
Check before you buy
- Verify your existing faucet supports a dedicated RO tap.
- Measure cabinet depth to fit the 17.3-inch unit.
- Check local water pressure meets the minimum requirement.
- Confirm brush nickel finish matches your kitchen hardware.
The product at a glance
A. O. Smith 800 GPD Tankless RO
Best for: High-volume daily water needs
- Capacity (GPD)
- 800 GPD
- Design
- Tankless, under sink
- Certification
- NSF/ANSI 42, NSF/ANSI 58, NSF/ANSI 372
- Filtration Type
- Reverse osmosis
- Contaminants Removed
- TDS, chlorine, taste, odor
- Installation Type
- Under sink
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This A. O. Smith unit delivers 800 gallons per day of reverse osmosis filtered water without a storage tank. Its slim 17.3-inch footprint saves under-sink space. It holds NSF/ANSI 58 and 372 certifications for TDS reduction and lead-free materials. The system includes automatic leak detection with audible alarms and auto-flush features for consistent quality. You get clean water faster for daily cooking and drinking needs.
Pros
- 800 GPD high-capacity tankless output
- NSF/ANSI 58 and 372 certified
- Built-in leak detection and auto shutoff
- Slim 17.3-inch depth saves space
Cons
- Heavier at 15.8 pounds
- Only includes a 2-year limited warranty
- No app or remote monitoring mentioned
Good fit if
- You need high daily water volume
- You want to save cabinet space
- You value certified safety standards
Skip if
- You prefer a traditional tank system
- You need smart home connectivity
- You require a longer warranty period
Verdict: A. O. Smith 800 GPD Tankless RO fits households needing fast, high-volume filtered water in tight spaces. It suits buyers prioritizing certified filtration and leak safety over smart features.
Specifications side by side
| Spec | A. O. Smith 800 GPD Tankless RO |
|---|---|
| Capacity (GPD) | 800 GPD |
| Design | Tankless, under sink |
| Certification | NSF/ANSI 42, NSF/ANSI 58, NSF/ANSI 372 |
| Filtration Type | Reverse osmosis |
| Contaminants Removed | TDS, chlorine, taste, odor |
| Installation Type | Under sink |
| Capacity | 800 GPD |
| Features | Chlorine Reduction |
| Color | Brushed Nickel |
| Dimensions | 17.3 × 5.1 × 15.5 inches |
| Weight | 15.8 pounds |
| Model | AOS-DFRO800-BN |
Frequently asked questions
What is the daily water production capacity of the A. O. Smith 800 GPD Tankless RO?
It produces 800 gallons of filtered water per day. This high output ensures you have a steady supply for cooking and drinking. The tankless design delivers water on demand without waiting for a storage tank to refill. This capacity suits households with high daily water usage needs.
How much space does the A. O. Smith 800 GPD Tankless RO require under the sink?
The unit measures 17.3 inches in length, 5.1 inches in width, and 15.5 inches in height. Its slim profile allows it to fit into tight cabinet spaces. You do not need extra room for a separate storage tank. This compact size helps maximize your under-sink storage area.
What is the weight of the A. O. Smith 800 GPD Tankless RO system?
The system weighs 15.8 pounds. This weight makes it manageable for installation under your sink. You can handle the unit easily during setup. The moderate weight does not require heavy-duty mounting hardware beyond standard installation requirements for under-sink appliances.
What color finish does the A. O. Smith 800 GPD Tankless RO have?
It features a brushed nickel finish. This color option helps the unit blend with modern kitchen fixtures. The aesthetic matches well with brushed nickel faucets and hardware. This design choice allows for a cohesive look in your kitchen cabinetry.
Does the A. O. Smith 800 GPD Tankless RO include a storage tank?
No, it uses a tankless design. This means there is no bulky plastic tank required for storing filtered water. The system produces water directly as you turn on the faucet. This design saves space and prevents the water from sitting stagnant in a reservoir.
What is the model number for the A. O. Smith 800 GPD Tankless RO?
The model number is AOS-DFRO800-BN. You can use this number to identify the specific unit in documentation or when ordering replacement parts. It distinguishes this brushed nickel version from other variants in the product line.