Cabinet & Chassis: One piece blow molded high‐density polyethylene plastic. Resists cracking, fading and yellowing. Color molded in to hide scrapes caused by rough usage. Easily removed for access to interior components. The shock absorbing base is made of ABS plastic that will never rust. Cold Water Refrigeration Unit: Convection cooled condenser. Internal, spring mounted, hermetically sealed compressor with automatic overload protector. No lubrication needed. Refrigerant is controlled accurately by a capillary tube. Cold Water Thermostat: Temperature is controlled by an adjustable thermostat with OFF position that is easily accessible on the rear of the unit. Cold Water Reservoir: Food grade stainless steel type SUS304, 1 gallon (3.8 liter) reservoir. Provides superior chilling for great tasting water. Highly polished surface is easy to clean and maintain. Electrical: Cooler operates on 115 volts, 60 Hertz Refrigerant: 100 Series are Energy Star rated Hot Water Tank: Food grade stainless steel type SUS304, 0.32 gallon (1.2 liter) capacity. The 520 watts heating element ensures precise temperature control.