A water extinguishing system (sprinkler system) is prepared taking into account details such as combustible material, whether there is a shelf structure, whether there is a risk of freezing, a risk group and accordingly regulated debit, pipe installation route, whether it is in an earthquake area. In this direction, the nozzle model is selected and the explosion temperature of the nozzle is determined. Valve groups are also adjusted according to the model of sprinkler extinguishing systems.