Do the circulators have an adjustable pump?

Yes, the HighTech heating circulator and refrigerated heating circulators include an adjustable, 4-speed pressure and suction pump. The centrifugal pressure/suction pump provides a 22-26 L/min flow rate with pressures from 5.8-10.2 psi and suction from 2.9-5.8 psi. The smart-pump adjusts speeds based on changes in the fluid’s viscosity.