Water fire extinguishers are best for Class A fires or ordinary combustibles. In fact this method has been used most widely around the world as their go-to method. However, water is not recommended for B or C class fires due to the hazards it could create. Water takes an immense amount of energy to heat or cool and simply applying it will pull a lot of the heat out immediately. You don’t have to worry about cleaning up chemicals or residues from water type extinguishers. This method is advantageous in places like furniture shops, homes, or offices.