Which of the following is a key factor in selecting a fixture's hydraulic load?

Selecting a fixture's hydraulic load is significantly impacted by the fixture type. Each type of plumbing fixture—such as sinks, toilets, showers, and faucets—has its own specific flow rates and demand based on its design and intended use. For example, a toilet will require a different volume of water compared to a shower fixture, which in turn operates differently from a kitchen sink. Understanding these requirements helps in accurately calculating the overall hydraulic load on a plumbing system, ensuring that it functions efficiently and meets code requirements.

Other factors, while relevant in the broader context of plumbing design, do not directly define the hydraulic load of a fixture. Pipe diameter influences water flow and pressure within the system but does not dictate the fixture's inherent load characteristics. Water temperature is important for various plumbing considerations but does not affect the hydraulic load directly. The location of installation can influence plumbing layout and potential pressure drops or flow restrictions, yet it is not a primary factor in determining the fixture's hydraulic load itself.