Single welded enameled Tank to withstand high pressure & reduce water leakage CFC free polyurethane insulation to reduce heat loss / energy saving USA Incoloy Heating Element for extended life span Rust & Corrosion protection with Magnesium Anode steel core Temperature Control: Adjustable automatic thermostat (25℃ to 75℃) Safety features: Over-temperature, over-pressure, water overflow, dry heating, Electric leakage protection, Safety Thermal cut off Included brackets & mounting accessories