In-line pumps designed for conditioning, heating, water recirculation in the presence of solar thermal panels (solar collectors) and for the circulation of hot drinkable water in commercial building service. The pump body, motor support and fan cover in cast iron. The impeller is in cast iron or technopolymer depending on the models. CM-G is equipped with a coupling. The CM, CM-G indicate single pumps, the DMC, DCM-G are twin pumps. In-line and flanged inlet and outlet ports. All models have air-cooled four-pole asynchronous motor.