The Water Distiller is ALL STAINLESS STEEL INTERNAL includes the top and the filter. In normal case,the plastic cover's life is one year,but stainless steel cover could be used all the lifetime. This item is suit for hospital, clinique, home, office, laboratory, travel and so on. Autoclave must adopt distilled water as operation medium.Even purified water has various minerals and can produce furring scale after evaporation at high temperture,which,after a period of time,can lead to leaking of steam due to improper closure.It can also lead to the clog in the narrow pipes and pressure sensor,to the malfunction of temperature sensor and to other failures. Once the furring scale enters hand piece and axis. lowering the turming speed of hand piece, thus reading its life span. Therefore ,using distilled water is necessary. But since all the teratology clinics are located far from each other. It is difficult for them to buy distilled water. Now with this Water Distilled Machine Provided, you have a reliable source of high quality distilled water as long as you input pipe water! mpore quality of water further. Plastic wind leaf change to aluminum wind leaf, impore cooling effect. Blue PET water bottle change to dark bule PC high-grade thermostability water bottle Specifications Power Input:110V Output Power:750W Inner size:180x200mm Volume:4L Distilled Max. Water/per :1.2-2L/H Net weight:4Kg Size:290×290×390mm Package size:300×300×500mm