used for wall fuel boilers vaillant models: atmoTEC reputable VUW INT 240/3-3 atmoTEC professional VUW INT 240/5-3 turboTEC professional VUW INT 242/3-3 atmoTEC plus VUW INT 240/3-5 turboTEC plus VUW INT 242/3-5 atmoTEC plus VUW INT 240/5-5 turboTEC pro VUW INT 242/5-3 turboTEC plus VUW INT 242/5-5