2. Twin Tank Steam cleaner -- a type of steam cleaner consists of a separate water
tank and the boiler that allows refilling the machine at any time without waiting to cool down the machine. This feature of a steam cleaner is known as continuous refill. It has a special sensor inside that detects the water level. When the water reaches the bottom level the sensor sends the command to an electronic board that begins the pump. The pump then takes the necessary amount of water from the cold water tank and fills the boiler. This is how continuous refill works. No waste of time for refilling; fast heat up of steam and does not limit the operating time of steam cleaning.