Circulating pumps for central heating circuit - has second separate pump working from common drive shaft

摘要

A circulating pump type device for the heating medium of a bailer, heat exchanger and supply system of a central heating unit has a second pump (13) separate from the circulating pump (8), coupled to the drive shaft (10) of the main circulating pump (8). This second separate pump (13) is used to produce an intermixing circuit between the heating supply flow pipe (3) and return pipe (4). Both pumps (8, 13), the drive shaft (10) and a body housing are constructed as a complete unit.