Expansion tanks when used in a ships hot water heating system may be of the open or closed type. In a closed type system, what would be the normal temperature range of the water?

Correct Answer: Option D — 220°F to 240°F

Closed-type hot water heating systems operate under pressure, allowing water temperatures to exceed the atmospheric boiling point of 212°F. A range of 220°F to 240°F is standard for these systems, as the pressurized expansion tank prevents steam formation and maintains liquid-phase circulation throughout the heating loop.