The 159 PRIME AIR series integrates a single flame pilot burner, the thermocouple and the ignition electrode with connecting wire. Pilot pipe with nut and olive is also mounted. Thanks to the mounting clips, thermocouple and ignition electrode can be easily replaced without the need of tools. The 159 series can be used with LPG or Natural Gas by mounting the appropriate injector and is suitable for universal use and in particular for the use on storage water heaters.