Taco’s ECM, wet-rotor 00e VR1816 circulator offers up to 85% savings in energy consumption compared to standard circulators of the same size. The circulator offers up to 18’ shut-off head and 16 gal. per min. flow. With the turn of a dial, it provides simple self-sensing variable-speed operation in three different modes: infinitely variable fixed speed; constant pressure, self-adjusting variable speed; and proportional pressure, self-adjusting variable speed.