A standard fire sprinkler system is always active and automatic utilising fireproof pipework that is filled with water and always ready to put a fire out whether there is someone in the building or not.
It is the equivalent of your personal fireman standing guard ready to protect you, your family, pets and belongings 24/7.
If the property has fire sprinkler heads fitted throughout, only the nearest one to a fire should operate thus limiting the amount of water damage to the fire area.
The sprinkler head detects the heat from a fire and quickly suppresses it, an audio alarm sounds notifying others that the system is operating.
If the mains water supply is inadequate whether through bar pressure or restrictive pipe sizing then a pump and tank can be fitted specifically for the sprinkler system. The type of sprinkler head, hydraulic calculations and infill water supply would determine the size of the tank that would be needed.