Having a reliable 5-gallon RO water storage tank can ensure you always have clean, filtered water on hand. This guide compares popular 5-gallon models, highlighting who each tank is best for, and why one may suit your system best. The selections below emphasize tasteless, odorless water, durable materials, and compatibility with common RO setups. Whether you’re replacing a worn tank or expanding a compact system, this overview helps you pick the right tank for your needs.
Summary table of selected products
- iSpring T55M 5.5 Gallon Residential Pre-Pressurized Water Storage Tank
- APEC Water Tank-4, 4 Gallon Pre-Pressurized Water Storage Tank
- TankRo GTS6 6-Gallon RO Storage Tank
- Neo-Pure 4.5 Gallon RO Water Storage Tank
- US Water Systems 4.5 Gallon RO Tank
iSpring T55M 5.5 Gallon Pre-Pressurized Tank
- 5.5 gallon metal pressurized tank with a food-grade butyl diaphragm
- Post-cure processes provide a tasteless and odorless water chamber
- Stainless steel 1/4″ NPT valve thread; Ball Valve Included
Best for: Home RO setups seeking a compact, tasteless storage solution with a durable metal shell. Avoid if you need a larger tank or non-metal construction for specific environments.
APEC Water Tank-4, 4 Gallon Pre-Pressurized Tank
- Pre-pressurized 4 gallon tank (holds up to 3.2 gallons)
- Vertical or horizontal discharge with tank stand
- Food-grade bladder and certified for quality, safety, and durability
Best for: Small kitchens or under-sink RO setups needing flexible orientation. Better for users who want straightforward installation and a compact footprint.
TankRo GTS6 6-Gallon RO Storage Tank
- Made from 100% food-grade materials
- Rigorous quality testing with a 1-year warranty
- Deep-drawn steel domes with precision welding for durability
Best for: Households wanting a robust, longer-lasting RO storage option with strong material quality. Choose this if you place priority on steel construction and a warranty; may be larger than needed for very small setups.
Neo-Pure 4.5 Gallon White RO Tank
- Stainless steel water connection; high-grade chlorobutyl diaphragm
- Virgin polypropylene liner; BPA free
- CE approved; post-cured diaphragm for long-term reliability
Best for: Users seeking tasteless, odorless water with a corrosion-resistant build and a high-quality liner. Better for those who value BPA-free components and long-term durability.
US Water Systems 4.5 Gallon RO Tank
- High-Pressure rated to 100 PSI
- Pre-charge to 5–7 PSI; 1/4″ NPT inlet fits standard connections
- Lightweight, compact, and designed for reusable storage
Best for: Homes that require steady performance under higher pressure and simple installation in tight spaces. Consider if you need a compact unit with standard connections.
Buying Guide: Key Considerations For 5-Gallon RO Tanks
- Material and safety: Look for food-grade diaphragms and liners to prevent taste and odor transfer. Steel domes add durability, but some users prefer corrosion-resistant plastics.
- Capacity and footprint: 5-gallon tanks vary slightly (4–6 gallons listed). Check your under-sink clearance and ensure the tank’s height and width fit your cabinet.
- Pressure rating: Tanks are pre-pressurized to a certain psi. Ensure compatibility with your RO system’s pump and membrane to maintain consistent water flow.
- Inlet/outlet compatibility: Most use 1/4″ NPT fittings. Verify that your system’s tubing matches to avoid tricky fittings or leaks.
- Orientation options: Some tanks discharge in vertical or horizontal positions. Choose a model that fits your space and plumbing layout.
- Warranty and warranties: A 1-year warranty or longer signals better durability for long-term use. Consider potential replacement costs and service options.
- Maintenance considerations: Look for diaphragms and liners that resist chemical degradation, ensuring water remains clean and safe over time.
Frequently Asked Questions
- What size RO tank should I choose for a small kitchen?
– A 4 to 5 gallon tank is typically ideal for under-sink RO systems and compact setups. - Do all 5-gallon tanks require the same fittings?
– Most use 1/4″ NPT fittings, but it’s important to confirm inlet/outlet dimensions for your specific system. - Is a metal tank better than a plastic tank?
– Metal tanks offer durability and stability, while plastic tanks can be lighter and resistant to corrosion in certain environments. - Can I install a 5-gallon RO tank in a horizontal position?
– Some models support horizontal mounting, but always follow the manufacturer’s installation guidelines for optimal performance. - Do these tanks affect taste or odor of water?
– When equipped with a tasteless, odorless diaphragm and a quality liner, they minimize taste and odor transfer into the water. - Should I replace my 5-gallon tank periodically?
– Replacement depends on system usage and diaphragm integrity; monitor for leaks, odors, or inconsistent pressure.