Question 198General Subjects - 1st Asst/Chief

The correct answer is C) Each heating coil inlet temperature is different, as the hot water inlet temperature to each heating coil progressively drops as the water passes through each successive series-connected coil. In a one-pipe hydronic heating system, the hot water flows through each heating coil in a series-connected arrangement. As the water passes through each successive coil, it loses some of its heat to the surrounding environment, resulting in a progressive drop in the inlet temperature to each subsequent heating coil. This means that the inlet temperature to each heating coil is different, with the first coil receiving the hottest water and the last coil receiving the coolest water. The other answer choices are incorrect because they do not accurately describe the temperature dynamics in a one-pipe hydronic heating system, where the inlet temperature to each heating coil decreases as the water flows through the series-connected coils.