If you need reliable horizontal plastic water tanks for outdoor storage, agriculture, RV use, or on-site water supply, these five options offer durable UV‑stabilized, rustproof polyethylene construction with clear capacity markings. They’re suited for non‑flammable liquids and portable setups. The following picks balance size variety, ruggedness, and practical features such as easy fill caps and bulkhead fittings. This guide helps buyers choose based on capacity, use case, and portability.
| Product | Brand | Capacity | Best For |
|---|---|---|---|
| RomoTech 82123919 Horizontal Square Reservoir Water Tank | RomoTech | 50 gallons | Small-scale RV or farm use; easy portability |
| RomoTech 82123909 Horizontal Square Reservoir Water Tank | RomoTech | 30 gallons | Compact spaces; portable setups |
| RomoTech 82123929 Horizontal Square Reservoir Water Tank | RomoTech | 100 gallons | Higher capacity outdoor storage |
| RomoTech 125 Gallon Polyethylene Storage Tank with Legs | RomoTech | 125 gallons | Industrial or farm-scale storage |
| Norwesco 66 Gallon Heavy Duty Multi-Purpose Horizontal Leg Tank | Norwesco | 66 gallons | Transport and flexible storage |
RomoTech 50 Gallon Horizontal Square Reservoir
Brand: RomoTech. Capacity: 50 gallons. Features include clear gallon/liter markings, UV-stabilized, rustproof poly tank, and a large 5-1/2″ lid with a 3/4″ NPT bulkhead outlet. Best for: outdoor storage on farms, RV setups, or work sites where portable water or non‑flammable liquids are needed. Limitation: translucent material helps monitor tank contents but may show algae in sunlight without regular cleaning.
RomoTech 30 Gallon Horizontal Square Reservoir
Brand: RomoTech. Capacity: 30 gallons. Features include molded gallon/liter markings, UV-stabilized, rustproof poly tank, and oversized lid with built-in bulkhead fitting and 3/4″ NPT outlet. Best for: compact setups needing portable storage for potable water or non‑flammable liquids. Caution: smaller opening may slow bulk refilling compared to larger tanks.
RomoTech 100 Gallon Horizontal Reservoir
Brand: RomoTech. Capacity: 100 gallons. Highlights include true capacity with 3/4″ NPT bulkhead, easy fill and drain, and UV-stabilized material for outdoor use. Best for: higher-demand water storage in farms or trailers. Choose this if you need a larger portable tank while maintaining a compact footprint. Limitation: larger size may require more space for placement and movement.
RomoTech 125 Gallon Polyethylene Storage Tank with Legs
Brand: RomoTech. Capacity: 125 gallons. Features include UV-stabilized, rustproof, BPA-free polyethylene with legs for stable placement. Best for: industrial or agricultural storage where leg support improves stability and drainage. Limitation: larger footprint may reduce portability in tight spaces.
Norwesco 66 Gallon Horizontal Leg Tank
Brand: Norwesco. Capacity: 66 gallons. Highlights include lightweight, sturdy design and molded-in strap-down grooves for safe transport; 5″ lid for easy filling. Best for: transport or storage of liquids and even granular solids in farm or outdoor settings. Caution: ensure contents align with tank’s compatibility, as metal or certain chemicals may require alternatives.
Elkhart Plastics 50 Gallon Utility Tank
Brand: Elkhart Plastics. Capacity: 50 gallons. Features include a large 6″ fill cap, 2″ NPS port, 3/4″ NPT outlet, translucent with molded gallon marks, and ribbed structure for secure strapping. Best for: dual outdoor and indoor use where easy dispensing and visibility are important. Limitation: check whether the specific chemical compatibility matches your liquid type before use.
WaterPrepared 35 Gallon Portable Tank
Brand: WaterPrepared. Capacity: 35 gallons. Features include UV-proof plastic for safety over time and a spigot compatible with standard garden hoses for easy water access. Best for: camping, hiking, or road trips where lightweight, portable storage is needed. Limitation: lower capacity compared to larger tanks; suitable for shorter trips or small outdoor gatherings.
Buying Guide: What To Consider When Choosing A Horizontal Plastic Water Tank
- Capacity and footprint. Choose a size that fits your space and expected water demand. Larger tanks store more water but require more installation space and handling.
- Material and durability. Look for UV-stabilized, BPA-free polyethylene to resist sun exposure, cracking, and contaminants over time.
- Portability vs. stability. Tanks with legs or low-profile bases are easier to place on trailers or trucks, while legged designs offer stable stance for stationary setups.
- Fittings and access. Bulkhead fittings, 3/4″ NPT outlets, and large fill caps simplify refilling and dispensing. Ensure compatibility with hoses, pumps, or pressure washers you plan to use.
- Markings and visibility. Clear gallon/liter markings help monitor levels at a glance, but translucent walls may require routine cleaning to prevent algae growth.
- Intended contents. Most tanks are suitable for non-flammable liquids like potable water and agricultural solutions; confirm chemical compatibility for any non-water liquids.
- Outdoor use considerations. UV stability and rust resistance extend life in sun-exposed environments; think about placement for best airflow and access.
FAQ
- What is the best tank size for RV use?
Answer: A smaller to mid-size tank like 30–50 gallons is typically easier to maneuver and fits compact spaces while still providing ample water supply. - Are these tanks suitable for drinking water?
Answer: Many are BPA-free and UV-stabilized for water storage; verify each product’s material specifications and local safety guidelines before use. - Can I use these tanks for chemicals?
Answer: Some tanks are designed for non-flammable liquids and agricultural solutions; always check chemical compatibility before use. - Do these tanks come with spigots or outlets?
Answer: Yes, most include bulkhead fittings and 3/4″ NPT outlets for easy dispensing and hose connections. - Are there any downsides to translucent walls?
Answer: Translucent walls allow level visibility but can encourage algae growth if exposed to bright sunlight; regular cleaning is recommended. - Which tank is best for long-term outdoor use?
Answer: Tanks with UV stabilization and rustproof poly construction are best for outdoor, all-season storage.