What situation would typically lead to high piping resistance in a heating system?

High piping resistance in a heating system is typically caused by a piping layout that spans multiple floors. When the piping runs through several floors, it not only increases the distance that the heated water or steam must travel but also results in more bends, turns, and elevation changes. Each of these factors contributes to friction and turbulence, leading to higher resistance in the system.

Longer vertical runs in particular can create additional challenges, such as air traps and increased pressure drop, which also contribute to the overall resistance within the heating system. Therefore, when designing a heating system, the layout and the number of floors that the pipes must transverse are critical factors that can significantly impact the efficiency and effectiveness of heat distribution.

Shorter pipe lengths, use of single-floor piping, or even multiple radiators would not inherently lead to the same level of resistance as a complex piping layout that navigates across multiple levels.