SimPure Small Water Pressure Tank Review
Product Overview
If you use a tankless reverse osmosis (RO) water system, you know the importance of consistent water pressure and flow. The SimPure Small Water Pressure Tank for Tankless Reverse Osmosis Systems is designed to enhance your system’s performance. This compact pressure tank helps maintain steady water pressure and supply, making water access smoother, especially for refrigerators and ice makers. It fits both 1/4" and 3/8" water pipes and saves counter space with its small size. Whether you’re tired of waiting for water or dealing with inconsistent ice maker output, this tank promises to improve your daily water experience.

SimPure Small Water Pressure Tank for Tankless RO System
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Key Takeaways
- Designed specifically to enhance tankless reverse osmosis system performance.
- Ensures smooth water flow for refrigerators and ice makers by reducing the need for frequent system reboots.
- Compact and space-saving, ideal for tight under-sink areas without requiring additional stands.
- Installation is straightforward, with fittings for both 1/4" and 3/8" water pipes included.
- Some users mention that initial setup requires careful attention to avoid leaks.
Why You Might Need a SimPure RO Pressure Tank
If you rely on a tankless RO system, you probably want reliable water pressure and timely delivery of filtered water. Without a storage tank, these systems can sometimes struggle to provide constant flow, especially when feeding your fridge or ice maker. This can mean waiting times or frequent system resets to regain pressure. The SimPure Small Water Pressure Tank addresses these hassles by storing filtered water under pressure. This ensures that you get water right away when you open the tap or use your ice maker. If you value convenience, smooth operation, and uninterrupted supply, this tank could be what your setup needs.
First Impressions: What to Expect
Out of the box, the SimPure water pressure tank feels solid and well-made. The materials used are food-grade and odorless, ensuring no taste interference with your water. The package comes with all fittings needed for quick installation with standard water pipes (1/4" and 3/8"). The compact cylindrical design (approximately 6.6" diameter by 9.2" height) makes it easy to fit in cramped spaces. The manual is straightforward, making this a handy addition even if you’re doing your own water system maintenance for the first time.
Specs at a Glance
Feature | Details |
---|---|
Tank Capacity | 1.4 Liters |
Dimensions | Diameter: 6.6", Height: 9.2" |
Pipe Compatibility | 1/4" and 3/8" water pipes |
Certification | NSF/ANSI 58 Standard certified |
Material | Food-grade butyl diaphragm |
Compatible Models | Fits various SimPure RO units (T1-400UV, Q3-600, etc.) |
Origin | Designed and served in Seattle, WA, USA |

SimPure RO Pressure Tank Specifications
Design & Build Quality
The first thing you notice is the compact design, which is much smaller than typical RO storage tanks. This is a boon for under-sink spaces where room is limited. The tank uses a food-grade butyl diaphragm to separate water from air pressure. This ensures the water remains fresh and free from any chemical taste or odor. The outer shell is sturdy, built to last under normal home water pressure conditions.
A standout feature is the inclusion of all necessary fittings for both common pipe sizes. This makes installation seamless and reduces the chances of leaks or mismatched connectors. One customer review sums it up well: "The fittings included made installation painless, and the tank’s small size fits perfectly without cluttering the space."
The build also meets NSF/ANSI 58 certification standards. This certification reflects careful testing for material safety and structural integrity. For you, that means peace of mind that the tank maintains water purity and durability over time.
Real-World Performance
In day-to-day use, the SimPure pressure tank shows noticeable improvements in water delivery speed and consistency. Take the scenario of filling a glass or dispensing ice cubes. Without this tank, users often report slow flow and system pauses. With the SimPure tank installed, water flows promptly with no waiting or pump cycling delays.
One user shared their experience, "Since adding this tank, my ice maker never stops due to low water pressure. It’s always ready, which was a major improvement." Such feedback is common among homeowners who want convenience from their RO systems.
The tank is also reliable over time, resistant to common issues like air leaks or pressure drops that can cripple smaller or cheaper tanks. It complements a variety of SimPure RO models, making it a versatile upgrade regardless of your current setup.

SimPure Tank Maintains Steady Water Flow
What Makes It Stand Out?
Compared to other small RO pressure tanks, the SimPure model shines in several ways. Its compact size is smaller or equal to leading competitors, but with better fittings included. Many brands sell tanks requiring extra adapters or custom parts, complicating installation. SimPure simplifies this process.
Additionally, the NSF certification is a key trust factor. Some competitors lack formal certifications, leaving questions about material safety or durability. SimPure’s compliance with strict NSF/ANSI 58 standards covers both material safety and structural soundness.
Two popular competing models include the AquaPro and the Home Master small tanks. AquaPro tanks often need extra connections and are slightly larger. Home Master tanks focus on durability but can be more cumbersome to install. SimPure balances ease of use, certification, and size effectively to serve most RO system users well.
Strengths vs. Trade-Offs
✅ Strengths | ❌ Trade-Offs |
---|---|
Enhances tankless RO system performance | Initial setup requires careful fitting for no leaks |
Includes multiple fittings for easy installation | Tank capacity (1.4L) may not suit high-demand setups |
Compact, space-saving design fits under sinks easily | Limited to specific RO system models compatibility |
Made with food-grade butyl diaphragm ensuring purity | Does not include installation tools like wrenches |
NSF/ANSI 58 certified for quality and safety | Smaller capacity means refill pressure cycles still possible under heavy use |
Trusted brand with US-based support since 2006 | Not suitable for RO systems requiring larger storage tanks |

SimPure Tank Strengths and Trade-Offs
Who Is It For?
If you fit any of these descriptions, the SimPure small water pressure tank could be a great addition to your home:
-
Tankless RO System Owners: If your RO system runs without a storage tank and you feel frequent delays or pressure drops, this tank will make your water flow more reliable.
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Ice Maker and Refrigerator Users: Those who want a steady supply of water for their fridge water dispensers or ice makers will appreciate how this tank eliminates slow flow and intermittent water supply.
- Space-Conscious Homeowners: If you have limited space under your kitchen sink or near your water system, its compact design fits where larger tanks won’t.
The tank complements a wide range of SimPure RO system models, but also works well with other brands sharing similar piping standards.
Expert Advice to Maximize Results
To get the most from your SimPure water pressure tank, consider these tips:
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Install Correctly: Follow the user manual carefully to avoid any leaks. Tighten fittings snugly but avoid over-tightening, which can cause damage.
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Check Compatibility First: Confirm your RO system uses 1/4" or 3/8" pipes and is compatible with a 1.4L tank size. Using this tank with incompatible models may reduce performance.
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Keep It Clean: Periodically inspect the tank for any signs of water quality issues or pressure changes. Clean or replace your RO system membranes and filters regularly to keep water purity high.
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Use with Refrigerators and Ice Makers: Position the tank near appliances needing stable water flow to get the best performance and reduced startup delays.
- Contact Support When Needed: SimPure offers US-based customer service for questions or troubleshooting. Don’t hesitate to reach out for guidance during installation or use.

Tips to Maximize SimPure Tank Performance
FAQ
Q1: What pipe sizes does this pressure tank support?
A1: The SimPure tank works with both 1/4" and 3/8" water pipes, making it compatible with most residential RO systems.
Q2: Is this tank NSF certified?
A2: Yes, it meets NSF/ANSI 58 Standards, ensuring material safety and structural reliability.
Q3: How does the tank improve RO system performance?
A3: By storing water under pressure, it ensures steady flow and reduces pump cycling and system reboots, especially useful for fridges and ice makers.
Q4: Can the tank be installed by a homeowner?
A4: Yes, the included manual offers clear instructions for easy installation. Basic plumbing skills are helpful but not strictly necessary.
Q5: What’s the tank’s water capacity?
A5: It holds 1.4 liters, ideal for small to medium household RO systems with moderate water demand.
Q6: Will it fit under any sink?
A6: Its small size (6.6 inches diameter, 9.2 inches height) is designed to fit most under-sink spaces without needing extra stands.
Q7: What if I have issues with the tank?
A7: SimPure provides US-based support with trained water specialists who can help with installation or performance questions.
Verdict
The SimPure Small Water Pressure Tank is an excellent upgrade for anyone with a tankless RO system seeking consistent water flow and pressure. It stands out with NSF certification, compact design, and ease of installation. Its ability to keep ice makers and refrigerators running smoothly makes it especially valuable for daily convenience. If you’re looking to smooth out your RO system’s performance without bulk, this tank deserves a spot in your home water setup.
