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What does 'boiler input' refer to?

  1. The physical size of the boiler

  2. The amount of water the boiler can hold

  3. The amount of heat energy consumed by the boiler

  4. The temperature setting of the boiler

The correct answer is: The amount of heat energy consumed by the boiler

Boiler input refers to the amount of heat energy consumed by the boiler. This means that it refers to the amount of fuel or electricity used to power the boiler and produce heat. Option A and B are incorrect because they focus on the physical size and water capacity of the boiler, which do not directly relate to the amount of heat energy consumed. Option D is also incorrect, as it refers to the temperature setting of the boiler, which is not the same as the actual energy input.