Filtered boiling and chilled water units are appliances that provide hot and cold purified water. They typically have a filtration system to remove impurities and a heating unit for HOT water and a refrigeration unit to provide chilled water. Some units are fitted with a CO2 gas canister to also provide sparkling water. These units are commonly used in offices, homes, and other settings where access to purified hot and cold water is desired. These are usually built into the sink cupboard and are be connected to the water supply