HydroLogic Hydro-Logic 31040 300-GPD Stealth-RO300 vs HydroLogic Hydro-logic Stealth RO 300 (2026): Key Differences
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Comparing the hydrologic hydro logic 31040 300 gpd stealth ro300 vs hydro logic reveals two high-capacity systems from the same brand. Both units deliver 300 gallons per day using reverse osmosis filtration. They share similar weights and core performance metrics. The main difference lies in their physical dimensions and listed features. One model is taller and narrower, while the other is wider and shorter. You need to check the space under your sink to ensure a proper fit for your specific installation.
Key differences
| Aspect | HydroLogic 300 GPD Black RO System | HydroLogic Stealth RO 300 |
|---|---|---|
| Dimensions | 12 x 26 x 6 inches | 5.9 x 18.7 x 16.6 inches |
| Weight | 11.8 pounds | 11.9 pounds |
| Color | Black | not listed |
| Features | Wall mountable bracket, auto shut-off, pH 3-11 | not listed |
Which one should you choose?
Choose HydroLogic 300 GPD Black RO System if
- You need a system with a wall mountable metal bracket for easier installation.
- You prefer a black finish that blends with dark cabinetry.
- You want a taller, narrower unit to fit in tight vertical spaces.
Choose HydroLogic Stealth RO 300 if
- You have a wider but shallower under-sink area.
- You do not require listed extra features like pH adjustment.
- You prefer a shorter unit that sits lower in the cabinet.
Verdict: Choose the HydroLogic 300 GPD Black RO System if you need specific mounting hardware and a defined color. Pick the HydroLogic Stealth RO 300 if your cabinet space is wider and shallower. Both provide the same daily output, so fit is your primary deciding factor.
System Dimensions and Mounting
Physical footprint
The HydroLogic 300 GPD Black RO System measures 12 inches wide, 6 inches deep, and 26 inches tall. Its compact width makes it suitable for standard under-sink cabinets or wall-mounted installations using the included metal bracket. The HydroLogic Stealth RO 300 is wider at 16.6 inches but shorter in height at 18.7 inches. It is slightly deeper at 5.9 inches. You should measure your available space carefully. The first model offers more vertical clearance, while the second fits into wider but shallower areas. Both designs prioritize space efficiency for residential or light commercial use.
Weight comparison
Both systems are built with substantial materials to handle high-pressure operation. The HydroLogic 300 GPD Black RO System weighs 11.8 pounds. The HydroLogic Stealth RO 300 weighs 11.9 pounds. The difference is negligible for installation purposes. You will need secure mounting for either unit due to their weight and the pressure they withstand. The slight weight difference does not impact structural integrity or durability. Both units are heavy enough to require sturdy shelving or wall anchors. Neither system is considered lightweight or portable.
Capacity and flow
Both units share the same core specification: 300 gallons per day capacity. This high output supports businesses or large households with significant water demand. The HydroLogic 300 GPD Black RO System specifies a maximum feed flow rate of 2 GPM. This rate ensures consistent production under varying pressure conditions. The HydroLogic Stealth RO 300 also delivers 300 GPD but does not list specific feed flow metrics in the provided data. You get the same daily volume from both. The first model provides more detail on flow dynamics, which helps in planning pipe sizing.
Filtration efficiency
The HydroLogic 300 GPD Black RO System removes 98 percent of chlorine and contaminants. It achieves a PPM rejection rate between 96 percent and 99 percent. This high rejection rate ensures clean output water. The HydroLogic Stealth RO 300 uses reverse osmosis filtration but does not list specific rejection percentages or chlorine removal rates in the provided data. You rely on the brand's standard performance for the second unit. The first model offers transparent data on its filtration precision, allowing you to verify its suitability for specific contaminant profiles.
Operational features
The HydroLogic 300 GPD Black RO System includes an automatic shut-off cartridge. This feature prevents tank overfilling and saves energy. It also notes a temperature limit of up to 140 degrees Fahrenheit. This allows operation in warmer environments without damage. The system wastes approximately 25 percent less water than other RO systems. The HydroLogic Stealth RO 300 does not list these operational features in the provided data. You benefit from explicit protection and efficiency claims with the first model. The second model's specific operational safeguards are not detailed here.
Choose Your Ideal Stealth RO System
Users needing wall mounting and specific dimensions
This model includes a wall mountable metal bracket for secure installation. Its dimensions are 12 inches wide, 6 inches deep, and 26 inches tall. This footprint suits standard under-sink cabinets or wall spaces. You get a dedicated mounting solution that the other unit does not list, ensuring stable placement in tight areas.
Buyers wanting detailed operational specifications
You receive clear data on flow and pressure. The maximum feed flow rate is 2 GPM. It removes 98 percent of chlorine and contaminants. The pH range is 3 to 11. This unit also features an automatic shut-off cartridge. These specific metrics help you verify compatibility with your water pressure and filtration needs.
Shoppers preferring a compact physical footprint
This unit measures 5.9 inches wide, 16.6 inches deep, and 18.7 inches tall. It is significantly shorter than the other option at 18.7 inches versus 26 inches. The depth is also reduced to 16.6 inches. If your cabinet space is limited in height or depth, this slimmer profile fits more easily without modification.
The products compared
HydroLogic 300 GPD Black RO System
Best for: High-volume household water needs
- Capacity (GPD)
- 300 GPD
- Filtration Type
- Reverse Osmosis
- Contaminants Removed
- Chlorine
- Color
- Black
- Dimensions
- 6 × 12 × 26 inches
- Weight
- 11.8 pounds
View on Amazon: HydroLogic 300 GPD Black RO System Affiliate link
This HydroLogic unit delivers 300 gallons per day of reverse osmosis filtration. It removes up to 98 percent of chlorine and contaminants with a rejection rate between 96 and 99 percent. The system wastes approximately 25 percent less water than standard RO systems. It features an automatic shut-off cartridge and wall-mountable metal bracket. This model suits users needing high daily output for larger households.
Pros
- Produces up to 300 gallons per day
- Removes 98 percent of chlorine and contaminants
- Wastes approximately 25 percent less water
- Includes wall-mountable metal bracket
Cons
- Requires significant space at 26 inches high
- Weighs 11.8 pounds
- No mention of smart monitoring or app control
Good fit if
- You need a high-capacity system for a large household
- You want to reduce water waste compared to standard RO units
- You prefer a wall-mounted installation for space saving
Skip if
- You have limited vertical space for a 26-inch unit
- You require smart connectivity or app monitoring
- You only need a small daily water volume
Verdict: HydroLogic 300 GPD Stealth RO System provides high-volume filtration for homes with significant water demands. It is ideal for users prioritizing capacity and water efficiency over smart features.
HydroLogic Stealth RO 300
Best for: tight under-sink spaces
- Dimensions
- 16.6 × 5.9 × 18.7 inches
- Weight
- 11.9 pounds
View on Amazon: HydroLogic Stealth RO 300 Affiliate link
The HydroLogic Stealth RO 300 is a compact reverse osmosis system designed for tight spaces. It measures 16.6 inches in length, 5.9 inches in width, and 18.7 inches in height. The unit weighs 11.9 pounds. This small footprint makes it suitable for under-sink installations where space is limited. You get a 300-gallon per day capacity in a slim profile.
Pros
- Compact length of 16.6 inches
- Narrow width of 5.9 inches
- Lightweight build at 11.9 pounds
- 300 GPD filtration capacity
Cons
- No app or remote control listed
- No built-in water quality display
- Standard tank size limits continuous flow
Good fit if
- You have a narrow under-sink cabinet
- You need a high-capacity system in a small footprint
- You prefer a simple mechanical setup
Skip if
- You require smart home integration
- You need a digital water quality monitor
- You have ample space for a larger unit
Verdict: HydroLogic Stealth RO 300 Compact System fits users with tight under-sink spaces who need high daily output. It suits those who prioritize physical dimensions over digital features.
Specifications side by side
| Spec | HydroLogic 300 GPD Black RO System | HydroLogic Stealth RO 300 |
|---|---|---|
| Capacity (GPD) | 300 GPD | not stated |
| Filtration Type | Reverse Osmosis | not stated |
| Contaminants Removed | Chlorine | not stated |
| Capacity | 300 GPD | not stated |
| Color | Black | not stated |
| Dimensions | 6 × 12 × 26 inches | 16.6 × 5.9 × 18.7 inches |
| Weight | 11.8 pounds | 11.9 pounds |
| Size | 1 Count (Pack of 1) | not stated |
| Model | 728820 | Stealth RO 300 |
Frequently asked questions
Are the HydroLogic 300 GPD Black RO System and the Stealth RO 300 the same model?
No, they are distinct models with different physical dimensions. The Black RO System has a model number of HL31040. It measures 12 inches wide, 6 inches deep, and 26 inches tall. The Stealth RO 300 is narrower at 5.9 inches wide. It is deeper at 16.6 inches and shorter at 18.7 inches tall. Both share the same 300 GPD capacity.
Which system is better for tight under-sink spaces?
The HydroLogic Stealth RO 300 is the better choice for tight spaces. Its width is only 5.9 inches. The Black RO System is 12 inches wide. The Stealth unit is also shorter at 18.7 inches compared to the 26-inch height of the Black model. This makes the Stealth system easier to fit in cramped cabinets.
Do both systems have the same water production capacity?
Yes, both systems produce 300 gallons per day. This high volume suits households with significant water needs. The HydroLogic 300 GPD Black RO System delivers this output. The HydroLogic Stealth RO 300 also provides the same 300 GPD rate. You get identical filtration capacity regardless of which physical footprint you choose.
Is there a wall mounting bracket included with these systems?
The HydroLogic 300 GPD Black RO System includes a wall mountable metal bracket. This allows for secure installation on a wall or cabinet interior. The provided data does not mention a bracket for the Stealth RO 300. You should check the Stealth package contents if you plan to mount it on a wall.
How much do these systems weigh?
The weights are nearly identical. The HydroLogic 300 GPD Black RO System weighs 11.8 pounds. The HydroLogic Stealth RO 300 weighs 11.9 pounds. This minor difference does not affect installation or stability. Both units are light enough for standard under-sink support structures.
What is the difference in color between the two models?
The HydroLogic 300 GPD Black RO System is black. The provided data does not specify the color of the Stealth RO 300. If appearance matters for your visible installation, you may want to verify the Stealth unit's finish separately. The Black model offers a consistent dark aesthetic.
Can I use the Stealth RO 300 for high-volume household needs?
Yes, the Stealth RO 300 is suitable for high-volume needs. It delivers 300 gallons per day. This output matches the larger Black RO System. It is ideal for users who need high daily output but have space constraints. The compact size does not reduce its filtration capacity.