Quick Answer
A larger tank is used in high-demand applications to provide sufficient storage capacity and maintain water pressure during periods of peak usage, such as multiple shower heads or simultaneous washing and drinking water usage.
Understanding High-Demand Applications
High-demand applications require a larger tank to maintain water pressure. For example, a household with multiple bathrooms or a commercial establishment with high occupancy rates demands more water than a single-family residence. A larger tank can help to prevent pressure drops and ensure consistent water supply.
Tank Sizing Formulas and Guidelines
To determine the required tank size, consider the following: A general rule of thumb is to have a minimum tank capacity of 30 gallons per simultaneous fixture. For example, a household with two bathrooms (two simultaneous fixtures) would require a minimum tank capacity of 60 gallons. Another approach is to use the peak demand formula: (number of fixtures) x (gallons per minute per fixture) = required tank capacity. For example, if a commercial establishment has 10 sinks with a flow rate of 2 gpm each, the required tank capacity would be 10 x 2 = 20 gallons per minute, or 20 minutes of water demand at 1 gpm (20 gallons).
Pressure Tank Size Selection
Select a tank that meets the required capacity and has sufficient pressure rating to maintain water pressure during peak demand. For example, if the required tank capacity is 100 gallons and the water supply pressure is 40 psi, select a tank with a pressure rating of at least 40 psi and a capacity of 100 gallons. Always consult local building codes and regulations for specific requirements.
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