Which type of sprinkler system is considered the simplest and least expensive?

The wet pipe system is recognized as the simplest and least expensive type of sprinkler system. This system operates with water already in the pipes, allowing for immediate activation in the event of a fire when a sprinkler head is activated. Because it primarily relies on gravity and the straightforward mechanics of water flow, it is easy to install and maintain, resulting in lower installation costs compared to more complex systems.

In contrast, dry pipe systems contain pressurized air that holds back water, which is released when a fire activates the sprinkler. This added complexity, along with the necessary equipment to manage the air pressure, makes it more expensive. Pre-action systems are more sophisticated and involve a combination of dry and wet pipe systems, often with a detection system to confirm fire presence before water is released, which adds to both the complexity and cost. Deluge systems, designed for high-hazard areas, involve wide-open sprinklers that release large amounts of water simultaneously, requiring significant plumbing infrastructure and maintenance, further elevating costs.

Overall, the wet pipe system's design, ease of deployment, and minimal components contribute directly to its status as the simplest and lowest-cost option among sprinkler systems.