Abstract: A device for igniting orchard heaters or the like consisting of a housing carrying a repeatable hammer with firing pin for firing an explosive primer to light the fuel/gas of the heater. The hammer and firing pin is contained within a cylinder which is driven by an associated fluid (fuel/gas) pressure source and the displacement of the cylinder causes compression of the spring for activating the hammer. A plurality of primers is contained in a disc which rotates and aligns a new primer before the firing pin after each firing is completed. The rotation of the disc is caused by the displacement of the cylinder.