What type of elevator is typically used for low-rise buildings with low speed requirements?

Hydraulic elevators are commonly used in low-rise buildings due to their design and operational characteristics. These elevators operate using a hydraulic system that involves a fluid-filled cylinder and a piston, allowing for smooth, powerful movement at relatively low speeds. This makes them particularly suitable for buildings that do not require the high speeds and advanced technology associated with electric traction elevators, which are better suited for taller structures.

The hydraulic system's advantages include a lower initial cost and simpler installation, making it an attractive option for buildings with fewer floors. Additionally, hydraulic elevators can handle substantial loads, which is beneficial in situations where heavier transportation, such as for passengers or smaller freight, is necessary.

In contrast, freight elevators are designed primarily for transporting goods rather than passengers and are generally not optimized for low-speed residential or office use. Electric elevators, while more efficient for longer distances and higher speeds, tend to be over-engineered for low-rise applications. Dumbwaiters, though useful for transporting smaller items, are not suited for carrying passengers at all. Thus, hydraulic elevators emerge as the most viable option for low-rise structures with moderate speed requirements.