Sprinkler Facts


  • In most systems, water remains in the piping until needed, leaving the fire sprinkler system "on call". 


  • Sprinklers are heat activated and will go off when the air temperature around it reaches or exceeds the preset temperature; most commonly it is 155 degrees F (or 74 C).


  • There are also cases in which the sprinkler head has activated in extremely cold weather, such as near an open window or door.


  • At extreme temperatures, the liquid expands or contracts inside the glass vial, breaking the glass and releasing the plug that holds back the water.


  • Fire sprinkler systems release anywhere from 35 to 60 gallons of water per minute per head; A fire department fire hose sprays 125 gallons of water per minute.


  • Only the sprinkler closest to the fire will activate.  Approx. ninety percent of fires are contained by the operation of just one sprinkler.


  • One activated sprinkler head can send a torrent of water in a 12’ x 12’ direction, enough to fill a bathtub in 1 to 2 minutes.


  • The water from a sprinkler head is laced with black and smelly dirt and debris from sitting for months or years inside the pipes.