Grundfos is expanding its line of energy-efficient ALPHA circulator pumps with the variable-speed ALPHA1, which the company says has a duty range that can replace every single-speed and 3-speed circulator in its class. The LED display ensures the ALPHA1 is delivering the optimal hydronic heating and/or hot-water recirculation flow rate at the lowest possible energy consumption. At the core of ALPHA1 is an ECM motor featuring a magnetized rotor to avoid motor-slippage problems common to induction-type motors. The company says the result is a dramatically more efficient motor that generates less heat and energy waste, while delivering a starting torque four times higher than a standard induction motor, and stronger than any other ECM pump in its class — a key feature should the circulator experience long periods of idleness. The ALPHA1’s constant restart feature attempts to restart indefinitely every seven seconds.

ALPHA1 offers a flow range of 0 to 19 gpm and a head range from 0 to 19 ft. It can handle fluid temperatures from 36°F to 230°F with a maximum working pressure of 150 pounds per square inch (psi).