| 摘要 |
<p>Two pumps (19,20) together with the heat exchanger (17) used to heat the sanitary water. It makes a unit (8) coupled to the heating and sanitary water circuit (3), possibly combining these two pumps into a double pump. Integrated backflow preventers (16) are used between first pump or double pump and exchanger and second pump if used to prevent return to the hydraulic group. The pumps are arranged upstream of the radiator (4) or downstream for return, preferably one pump upstream and one downstream. The heat source (11) is a gas burner, or again a district-type heat exchanger (12). The bypass (15) with inbuilt preventer is integrated in group parallel to a sector (2a) of the heating water circuit.</p> |
