Quick Answer
Choose a pressure tank with a capacity of 1/4 to 1/3 gallon per square foot of home space, and a minimum of 20 gallons for single-story homes and 30 gallons for multi-story homes.
Calculating Water Pressure Tank Size
When selecting a pressure tank for a solar water setup, it’s essential to calculate the tank size based on the home’s water demands. A general rule of thumb is to choose a tank with a capacity of 1/4 to 1/3 gallon per square foot of home space. For example, a 1,500 square foot home would require a 375 to 525 gallon tank.
Considering Pressure Tank Material
Pressure tanks can be made from various materials, including steel, plastic, and fiberglass. Steel tanks are durable and long-lasting but may corrode over time, especially in areas with high salt content. Plastic tanks are lighter and less expensive but may crack or leach chemicals into the water. Fiberglass tanks offer a balance of durability and affordability, making them a popular choice for off-grid systems.
Key Performance Indicators for Pressure Tanks
When selecting a pressure tank, consider the following key performance indicators (KPIs): tank volume, working pressure, and drawdown capacity. The tank volume should be sufficient to supply the home’s water demands during peak periods. The working pressure should match the system’s pressure requirements, and the drawdown capacity should be sufficient to handle sudden changes in water demand. Look for tanks with a high KPI rating to ensure optimal performance and longevity.
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