Deluge water fire protection is the most common type of fire protection. In a deluge suppression system, the goal is to "drown" the affected area with large amounts of water. Deluge has large heat absorption capacity, and also cools the fuel of the fire below ignition temperature. Deluge is also the most inefficient fire protection system due to the large amounts of water that can be wasted. Deluge can also result in significant property damage due to the large amounts of water used. Large capacity FullJet® nozzles or SpiralJet® nozzles are typically better suited for these applications. Sprinkler type systems are also used for deluge applications.

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