What factor can lead to efficiency losses aside from leaks?

Poor insulation is a significant factor that can lead to efficiency losses in a power system. When insulation is inadequate, heat can escape from pipes, boilers, and other components, causing the system to work harder to maintain the required temperatures. This loss of heat not only results in wasted energy but also leads to increased fuel consumption, thereby reducing overall efficiency.

In contrast, high-quality fuel typically enhances efficiency by providing better combustion characteristics and energy output. Proper maintenance ensures that equipment operates optimally, while optimized valve operation is designed to control flow and pressure efficiently, both of which contribute to maintaining system performance. Thus, while these options can positively impact system efficiency, only poor insulation directly contributes to energy loss through heat transfer.