They are pumps that can be directly connected to the installation with in-line (inlet - outlet on the same line) connection and are used for circulation of hot or cold water in domestic and industrial heating, cooling, air conditioning and sanitary installations.
HNL Series in-line frequency controlled circulation pumps meet the system demand by keeping the differential pressure required by the system constant (dP: constant) in variable flow demands through the frequency control unit integrated on the product, reduces operating costs with the advantages of variable speed, and guarantees quiet and long-lasting operation.
Note: Please contact our company for the prices of frequency controlled models.