Choosing the best flexible water tank for your boat provides a practical and space-saving solution for fresh water storage on board. Flexible tanks offer versatility, easy installation, and durability compared to rigid tanks, making them suitable for limited space and mobile applications. This guide reviews the top flexible water tanks and related accessories designed for marine use, taking into account capacity, materials, fittings, and compatibility.
| Product | Brand | Capacity | Material | Key Feature |
|---|---|---|---|---|
| NuovaRade Flexible Water Tank/Bladder, 14.5 Gal | Nuova Rade | 14.5 Gallon (55L) | Non-Toxic PVC | Compact, form-fitting with metal hooks for stability |
| TPU Water Storage Bladder, 35 Gallon Portable RV Fresh Water Tank | ITRAZ | 35 Gallon | Food-Grade TPU (Polyurethane) | Durable, foldable, with stainless steel fittings |
| Class A Customs 10 Gallon RV Concession Fresh Water Tank with Pump | Class A Customs | 10 Gallon | NSF Approved Material | Includes plumbing kit and 12V water pump |
| A.A 1-3/8″ Fill Hose with Flats for RV Concession Fresh Water Tank (10 ft) | A.A | N/A (Accessory) | Ethylene Copolymer | Flexible, kink-resistant hose for fresh water fill |
| 1-3/8″ Fill Hose for RV Concession Fresh Water Tank (5 ft) | Automotive Authority LLC | N/A (Accessory) | Ethylene Copolymer | Durable fill hose with easy clamping |
NuovaRade Flexible Water Tank/Bladder – 14.5 Gallon
The NuovaRade Flexible Water Tank is designed for fresh water storage on boats where rigid tanks aren’t viable. It is made of durable non-toxic PVC, providing high resistance to tearing and abrasions. Measuring 29 by 24 inches and holding 14.5 gallons, it offers a compact shape to fit varied spaces.
This tank features two welded fittings: a 38 mm inlet and a 12 mm outlet valve with tightening rings for a secure seal. Metal hooks allow for hanging installation, enhancing stability. While suitable for kitchen and shower water, it is not intended for drinking water.
ITRAZ TPU Water Storage Bladder – 35 Gallon Portable Tank
This 35-gallon TPU water bladder offers food-grade, BPA-free water storage ideal for boats, RVs, and emergency use. The high-density TPU fabric is BPA-free, odorless, and non-toxic, making it safe for storing drinking water without affecting taste.
Its foldable design reduces storage size by over 92%, while still supporting significant water weight and resisting punctures. The 304 stainless steel GHT threaded fittings provide durable, leak-free connections compatible with standard hoses, pumps, and water filters.
Class A Customs 10 Gallon RV Fresh Water Tank with Plumbing Kit
The Class A Customs 10-gallon fresh water tank is manufactured from NSF-approved materials, safe for potable water on boats. Measuring compactly at 19 by 9 by 14 inches, it can be positioned on any side to fit available space.
It features built-in fittings for secure plumbing with female NPT threads and is designed for non-pressurized use, requiring venting for safe filling and operation. The included 12-volt water pump and plumbing kit facilitate water circulation on-board.
A.A 1-3/8″ Fill Hose with Flats for Fresh Water Tank – 10 Feet
This 10-foot flexible fill hose is made from ethylene copolymer offering excellent flexibility with no kinking, perfect for connecting gravity water fills to fresh water tanks on boats or RVs. The hose features flats allowing easy attachment with hose clamps (not included).
Its sturdy design ensures reliable water flow and easy installation in tight spaces, making it a practical complement to any flexible water tank system aboard a boat.
Automotive Authority 1-3/8″ Fill Hose for Fresh Water Tank – 5 Feet
Similar to the A.A hose, the Automotive Authority 5-foot fill hose is crafted from ethylene copolymer, providing kink resistance and flexibility essential for freshwater tank fills. The hose is compatible with common hose clamps and is suitable for boats, campers, and trailers.
Its shorter length is ideal in setups requiring a compact hose for tight installations, and it ensures reliable water delivery without disruption.
Buying Guide: Key Considerations for Flexible Water Tanks for Boats
Investing in a flexible water tank requires evaluating multiple factors to ensure it meets your boating needs efficiently:
Material and Safety
- Food-grade quality: Choose tanks made from BPA-free, PVC-free, or TPU materials certified safe for fresh and drinking water to avoid contamination and odors.
- Durability: Look for materials with high tear and abrasion resistance to withstand marine conditions and frequent handling.
Capacity and Size
- Select a tank size that aligns with your water consumption needs and available storage space aboard. Flexible tanks are ideal for maximizing space due to their form-fitting properties.
- Consider foldability for empty storage to save room when the tank is not in use.
Installation and Fittings
- Ensure tanks have appropriate inlet and outlet fittings compatible with your boat’s plumbing, preferably with standard thread sizes like GHT or NPT.
- Metal or stainless steel fittings provide more durability compared to plastic ones, reducing leak and damage risks.
- Look for tanks with mounting options like hooks or straps to secure tanks and prevent shifting during travel.
Water Type and Compatibility
- Check whether the tank is rated for potable drinking water or non-potable use (e.g., kitchen/shower only).
- Some flexible tanks are designed specifically for RV or marine use, incorporating features to resist mold and mildew.
Accessories and Maintenance
- Consider complementary products such as fill hoses and water pumps to facilitate filling and dispensing water onboard.
- Ease of cleaning is important; select tanks with wide openings or removable fittings to enable thorough maintenance.