Water Fire extinguisher is the most commonly used extinguisher for Class A fires involving carbonaceous materials such as wood, paper textile. Water extinguishers cool the fire by removing the heat needed to sustain burning.
Advantages: Water is usually inexpensive and readily available. It is an effective extinguishant for Class A fires.
Disadvantages: Water is only suitable for Class A fires. It may be dangerous on other classes of fires and must not be used on fires involving energized electrical equipment.