It has full 304 stainless steel interior, glass collection bottle, glass nozzle insert. It distills 1 liter in an hour. It is tested to ensure that this device is a safe home appliance. Includes automatic shut-off, internal thermostat to prevent overheating, and surge protection. It is widely used in dental products, vaporizers, humidifiers, CPAP machines, lead-acid batteries, engine cooling systems, steam irons, waterfalls, fish aquariums, etc.