Freshwater Tank Onboard

Types of Water Tanks for Boats

1. Flexible Water Tanks

Flexible water tanks are valued for their adaptability and ability to fit into tight spaces on a boat.

• Adaptability: Their flexible structure allows them to be installed in irregular or hard-to-reach areas, maximizing available space.

• Lightweight: Lighter than rigid tanks, which can help reduce the overall weight of your boat.

• Easy Installation: They generally do not require complex supports for installation.

Note: While convenient, flexible tanks are more vulnerable to mechanical damage and may be less durable than rigid tanks.

2. Rigid Water Tanks

Rigid water tanks offer a robust and durable solution for water storage.

• Durability: Made from hard plastic or stainless steel, these tanks are resistant to impact and less likely to leak.

• Variety of Shapes: Available in vertical or horizontal forms, they can be installed under seats, in the bilge, or other designated spaces.

• Ease of Cleaning: Their smooth interior surface makes cleaning and maintenance easier.

Tip: Rigid tanks are ideal for permanent installations where strength is a priority.

Factors to Consider When Choosing a Water Tank

• Capacity
  The capacity of your water tank will depend on the size of your boat and the number of people on board. Here are some recommendations:

  • Short Navigation: For a small boat or a day trip, a 20 to 50-liter tank may suffice.

  • Medium Cruise: For cruises lasting a few days, a 100 to 200-liter tank is recommended.

  • Long Cruise: For extended trips, consider a tank larger than 300 liters or combine several tanks to increase your total capacity.

• Location and Installation
  The location of the tank should be chosen carefully to optimize space and maintain good weight distribution:

  • Horizontal vs. Vertical: Horizontal tanks are perfect for installation under the deck, while vertical tanks can be placed in compact spaces where height is available over surface area.

  • Accessibility: Ensure the tank is easily accessible for filling, maintenance, and cleaning.

  • Ventilation: It is crucial to install a vent to allow air circulation in the tank, preventing pressure buildup and improving water flow.

• Materials
  Water tanks can be made from various materials, each offering unique benefits:

  • Polyethylene Plastic: Lightweight and corrosion-resistant, it’s the most common material for both flexible and rigid tanks.

  • Stainless Steel: Strong and durable, stainless steel is ideal for rigid tanks but is more expensive and heavier.

  • PVC: Primarily used for flexible tanks, PVC is flexible but must be of high quality to avoid leaks and ruptures.

Water Filling and Management Systems

• Remote Filling
  Remote filling makes it easier to refuel your water tank without direct access:

  • Filling Neck: Install a filling neck on the deck, connected to the tank by a hose, allowing you to fill the tank from outside the boat.

  • Water System Connection: For larger tanks, it may be convenient to connect them to an automatic filling system when at the dock.

• Desalination Unit
  For long voyages or offshore navigation, a desalination unit can convert seawater into freshwater:

  • Self-Sufficient Production: Allows continuous production of freshwater, reducing reliance on onboard freshwater reserves.

  • Energy Considerations: Desalination units require sufficient energy to operate, which must be factored into your overall energy management onboard.

Maintenance and Cleaning

To ensure the quality of water onboard, regular maintenance of your tank is essential:

• Periodic Cleaning: Clean the interior of the tank several times a year to prevent mold and bacteria growth.

• Water Treatment: Use water treatment products to maintain the purity of the stored water and prevent limescale buildup.

• Pipe and Seal Inspection: Regularly check the pipes and seals for leaks or wear.