What is a characteristic of a "Hot water supply boiler"?

A hot water supply boiler is specifically designed to provide hot water for purposes such as space heating, domestic hot water, or other applications requiring hot water. One defining characteristic of this type of boiler is that it typically has a significant heat input, often exceeding 200,000 British thermal units per hour (Btu/hr). This higher heat input capacity allows the boiler to efficiently meet the demands of larger facilities or applications where high volumes of hot water are necessary.

The other options outline characteristics that are either not universally applicable to hot water supply boilers or are specific to boiler types that serve different functions. For instance, operating at pressures over 200 pounds per square inch and exceeding temperatures of 250 degrees Fahrenheit is typically more relevant to specific hot water heating systems rather than being a standard characteristic of hot water supply boilers in general. Additionally, while hot water supply boilers can be fueled by various sources, including gas, oil, or electricity, they are not restricted to electricity. Thus, the requirement for a heat input exceeding 200,000 Btu/hr stands as the most definitive characteristic of hot water supply boilers.