Quick Answer
For off-grid cabins, the best type of water storage is a food-grade, UV-resistant, and airtight polyethylene tank or a concrete cistern with a durable liner, both of which can hold 1,000-2,000 gallons of water.
Choosing the Right Tank Material
When selecting a water storage tank for an off-grid cabin, consider the material’s durability, resistance to UV rays, and ability to prevent bacterial growth. Polyethylene tanks are a popular choice due to their low cost, ease of installation, and resistance to corrosion. However, they may degrade over time, so it’s essential to choose a high-quality, food-grade material that can withstand the elements. A good option is a UV-resistant polyethylene tank with a thickness of at least 0.250 inches (6.4 mm). This will provide adequate protection against UV rays and ensure the tank lasts for many years.
Cistern Considerations
Concrete cisterns with a durable liner are another option for off-grid water storage. They can hold 1,000-2,000 gallons of water and are less prone to degradation than polyethylene tanks. However, they require more maintenance, as the liner needs to be inspected and replaced periodically. When building a cistern, consider using a liner with a thickness of at least 20 mils (0.5 mm) to ensure it can withstand the water pressure. Additionally, ensure the cistern is properly vented to prevent airlocks and water hammer.
Tank Size and Location
The size of the water storage tank will depend on the cabin’s water needs and the number of occupants. A general rule of thumb is to store at least 1,000 gallons of water per person per month. When selecting a location for the tank, choose a spot that is level, accessible, and protected from direct sunlight and extreme weather conditions. Avoid placing the tank near potential water sources, such as wells or streams, to prevent contamination.
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