Best 20 Gallon Poly Tank Options for Versatile Water Storage
Finding a reliable 20 gallon poly tank is essential for home, RV, and commercial storage needs. The following selections focus on durable, food-grade or rugged polymer tanks suitable for potable water, storage, and general use. Each entry highlights key features to help you compare capacity, materials, and installation options.
| Product | Brand | Capacity | Use |
|---|---|---|---|
| MercuryFloor WVP20 Storm Wet/Dry Tank Vacuum | MERCURY FLOOR MACHINES | 20 gallons | Industrial vacuum system reservoir |
| iSpring T20M 20 Gallon Tank | iSpring | 20 gallons | RO pre-pressurized storage |
| APEC TANK-20 20 Gallon Tank | APEC WATER | 20 gallons | RO water storage |
| Ameri-Kart 20 Gallon RV Water Tank | Ameri-Kart | 20 gallons | Potable RV water storage |
| Norwesco 20 Gallon Flat Bottom Tank | Norwesco | 20 gallons | Utility water storage |
Mercury Floor Wvp20 Storm Tank

The Mercury Floor WVP20 Storm Wet/Dry Tank Vacuum features a 20-gallon poly tank paired with dual 1.335 HP/1000-watt motors and separate controls for each motor. The rugged poly tank is complemented by a 10-ft vacuum hose, a chrome-plated steel “S” wand, and a vacuum head. The hose locks securely to the tank port for stable operation in demanding environments. This tank is designed to support heavy-duty cleaning and debris removal tasks while maintaining durable construction.
iSpring T20M 20 Gallon Tank

The iSpring T20M pre-pressurized 20-gallon tank is designed for RO systems, offering 14 gallons of water storage capacity. It includes a shut-off valve, tank connector, and a stand, with flexible positioning to fit either vertical or horizontal configurations. The tank is manufactured with materials tested to meet NSF and ANSI standards, ensuring quality and safety for drinking water storage and delivery in reverse osmosis setups.
APEC TANK-20 20 Gallon Tank

APEC’s TANK-20 is a pre-pressurized 20-gallon water storage tank designed for RO systems. It stores up to 14.8 gallons of water and supports vertical or horizontal discharge with a tank stand. The tank is built with a food-grade bladder and certified for quality, safety, and durability, making it suitable for home purification systems and robust storage applications.
Ameri-Kart 20 Gallon RV Water Tank

Ameri-Kart’s 20-gallon RV water tank provides potable water storage for drinking, cooking, cleaning, and showers in RVs, motor homes, trailers, campers, and tiny houses. Made in the USA from BPA-free materials, it features multiple fitting options for installation with two 1.5″ balloon-style threaded female NPT connections and two 0.5″ threaded female NPT connections. The tank is designed for durability and leak-proof operation with weather-resistant construction and IAPMO standards compliance.
Norwesco 20 Gallon Flat Bottom Tank

The Norwesco 20-gallon flat bottom utility tank features a large 5-inch opening for easy filling and a one-piece polyethylene construction. Its simple design emphasizes durability and serviceability for portable water storage or light-duty chemical storage. The flat bottom helps with stability and efficient placement in compact spaces.
Buying Guide: Key Considerations For 20 Gallon Poly Tanks
- Intended use: potable water storage, RO pre-pressurization, RV water supply, or general utility storage. Choose tanks with appropriate certifications (NSF/ANSI for drinking water) and materials that suit your application.
- Material and durability: Look for high-density polyethylene (HDPE) or comparable food-grade poly materials. Ensure the tank has thick walls or reinforced sections if used in mobile or rough environments.
- Pressure and venting: For RO systems, pre-pressurized tanks maintain consistent performance. Verify compliance with your system’s pressure requirements and any necessary shut-off or vent features.
- Fittings and compatibility: Check the availability and size of NPT fittings, valve connections, and the ability to mount or position the tank vertically or horizontally as needed.
- Installation options: Some tanks come with stands or mounting hardware. Consider space constraints, weight distribution, and accessibility for maintenance or cleaning.
- Maintenance and cleaning: Tanks with smooth interiors and accessible openings simplify cleaning and disinfection, which is important for potable water storage.
- Lifecycle and warranties: Durable poly tanks with longer warranties reduce long-term replacement costs and provide reliability for critical storage needs.
- Cost and availability: Compare mainstream brands for availability of replacement parts, hoses, and fittings, especially for RV or residential uses.
Overall, select a 20 gallon poly tank that aligns with your specific storage or purification goals, ensuring compatibility with existing systems, local codes, and the environment where the tank will operate.