Features / Features vacuum furnace boiler in a closed form a negative pressure inside the vacuum environment, filling the heat medium in the body of water. Heated by combustion heat medium water, evaporated by the heat medium water - condensation onto the heat exchanger, and then by a heat exchanger to heat the water to be heated. A boiler configuration of multiple heat exchangers to achieve more than one machine. Vacuum boiler works: the use of water at low pressure low boiling characteristics, rapid heating furnace sealed body filled heat medium water, heat medium temperature steam to evaporate the water boils, water vapor condenses on the heat transfer tubes heating the cold water heat transfer tubes, reaching supply. Hot Objective: According to the State Administration of Quality Supervision, Inspection and Quarantine issued in 2002 "on the implementation of small and atmospheric pressure hot water boiler safety monitoring requirements technical issues related to notice" vacuum boiler installation does not require confirmation by the quality and technology supervision department, also no registration formalities. Purpose / Uses for hotels, businesses, restaurants, offices, schools, hospitals and other units of water supply, the need of heating.