Quick Answer
Pressure tanks can be used for both hot and cold water, but the design and materials used may need to be adjusted to accommodate the temperature differences.
Pressure Tank Considerations for Hot Water
When used for hot water, pressure tanks require materials that can withstand higher temperatures, such as stainless steel or epoxy-coated steel. The tank’s insulation should also be rated for high temperatures to minimize heat loss. For example, a 500-gallon pressure tank used for hot water might be designed with a 200°F (93°C) rating and insulated with a minimum of 2 inches (5 cm) of fiberglass.
Water Pressure Tank Sizing for Different Water Temperatures
The sizing of a pressure tank can be affected by the water temperature, as the tank’s ability to store water is influenced by its volume and the water’s temperature. For cold water, a tank can be sized based on the water’s density at 40°F (4°C), while for hot water, the tank should be sized based on the water’s density at the desired operating temperature. For example, a 40°F (4°C) water density is approximately 62.4 pounds per cubic foot (lb/ft³), while a 100°F (38°C) water density is approximately 62.3 lb/ft³, indicating a minimal difference in tank sizing.
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