The principle of non-pressurized water heating systems with tank under the roof

The water is self-driven to the end point. The vacuum tubes are installed on the roof while the tank which carries the most of the hot water is located in the boiler room. Can heat a pool of any size. In special cases these systems can be used for partial heating of the building if the hot water consumption in winter is much lower than in summer. These systems’ advantage is low ownership price. The disadvantage is that the whole system stops when a single tube is damaged.