Red Seal Plumbing Practice Exam

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What does the net rating of a boiler indicate?

Maximum heat produced by the boiler
Amount of fuel consumed per hour
Amount of heat energy available at the heat transfer units
Total energy consumption of the building

The correct answer is: Amount of heat energy available at the heat transfer units

The net rating of a boiler indicates the maximum amount of heat energy available at the heat transfer units. This is different from the maximum heat produced by the boiler (option A), which does not take into account any potential losses in heat transfer. Option B, the amount of fuel consumed per hour, is not necessarily related to the net rating as it can vary based on factors such as efficiency and heating load. Option D, total energy consumption of the building, is also unrelated to the net rating as it includes energy usage from sources other than the boiler.