What does 'pressure drop' refer to in a hot water system?

'Pressure drop' in a hot water system refers specifically to a reduction in water pressure as the fluid travels through the system. This reduction can occur due to various factors, such as friction between the water and the pipes, bends and turns within the piping, and the presence of fittings or valves.

Understanding pressure drop is crucial for ensuring that hot water reaches its desired destination effectively. If the pressure drop is significant, it can lead to inadequate water flow to fixtures and, consequently, insufficient hot water supply. This concept is vital for plumbers and technicians when designing or troubleshooting a hot water system to maintain optimal performance.

While increases in pressure can sometimes occur in specific scenarios, they are not what is meant by pressure drop. Changes in temperature can affect water density and pressure but are not equivalent to a pressure drop. Blockages are a different phenomenon that may cause a pressure drop, but they are not synonymous with it; rather, a blockage would be one potential cause of pressure drop, not the definition itself.