The plumbing system consists of water supply lines, water disposal lines, hot water heaters, and what else?

The plumbing system indeed comprises essential components that facilitate the delivery and removal of water in a building. Plumbing fixtures, such as sinks, toilets, bathtubs, and showers, are the physical pieces of equipment installed within the plumbing system that allow for the use of water for various household tasks, including washing and sanitation.

These fixtures play a crucial role in connecting water supply lines and drainage systems, enabling water to be used and then effectively disposed of. Therefore, when considering the components of a plumbing system, plumbing fixtures are a natural inclusion as they directly impact how water is utilized within a property.

On the other hand, tools and equipment used for plumbing work, such as plumbing tools and heating elements (which may be part of hot water systems but are not standalone components of the plumbing system), or drainage systems that work with disposal lines, do not serve as primary components of the plumbing system but rather as supporting elements.