heat exchange and storage unit for water heaters, procedures to manufacture and water heater with such a unit

摘要

An integrated heat exchange and storage unit (6) for a water heating apparatus (1) is described, which comprises: a storage tank (8) of hot primary water for space heating including a containing casing (20) wherein a storage zone (35) of a predetermined amount of said hot primary water is defined; a water-water heat exchanger (7) for producing hot sanitary water externally associated to the storage tank (8) of the hot primary water, means (29, 30) being provided for putting the water-water heat exchanger (7) in fluid communication with the tank (8). In an embodiment, the storage tank (8) also accomplishes the task of expansion tank adapted to compensate the heat expansion of the hot water stored inside the same. Advantageously, the integrated unit (6) allows a prompt delivery of hot sanitary water although it has extremely reduced weight, size and cost. IMAGE