● The liner is made of 316L/2205 stainless steel and requires no anode rod protection. ● LCD display, intelligent programming 7 days *24 hours a day, automatically controls night operation and weekend downtime ● Rated working pressure of liner 0.6MPa ● Solid state adjustment step control (suitable for models above 180KW) ● High-density glass fiber wool insulation at least 75mm thick ● In-immersed flanged INCOLOY heating elements ●UL certified AC contactor with a service life of more than 500000 cycles ● Equipped with various safety protections such as over-temperature protection, overpressure protection, anti-dry burn protection (water shortage protection), sensor fault alarm, and leakage protection. ● The liner is guaranteed for six years, and the parts are guaranteed for one year