A boiler operating at 210 F or higher must have a minimum capacity of how many gallons?

A boiler operating at 210 F or higher must have a minimum capacity of how many gallons?

• A. 60 gallons
• B. 90 gallons
• C. 120 gallons
• D. 240 gallons

Answer: (C)

Having enough thermal mass in a high-temperature boiler system is essential to keep the water temperature stable and to meet demand without causing unsafe conditions. When a boiler operates at 210 °F or higher, the required minimum storage capacity is 120 gallons. This amount provides a sufficient buffer to absorb heat, smooth out temperature fluctuations, and reduce short-cycling as loads change, helping maintain safe operation. Capacities below this threshold won’t meet the safety/operational requirement, while larger tanks would still satisfy the rule, but 120 gallons is the baseline that must be met.

Having enough thermal mass in a high-temperature boiler system is essential to keep the water temperature stable and to meet demand without causing unsafe conditions. When a boiler operates at 210 °F or higher, the required minimum storage capacity is 120 gallons. This amount provides a sufficient buffer to absorb heat, smooth out temperature fluctuations, and reduce short-cycling as loads change, helping maintain safe operation. Capacities below this threshold won’t meet the safety/operational requirement, while larger tanks would still satisfy the rule, but 120 gallons is the baseline that must be met.