Taco VT2218-HY1-FC1A00 CIRC,ECM,VAR SPD High Efficiency Motor Delta-T operation maximizes system efficiency and comfort High-efficiency ECM motor uses up to 85% less electricity LCD displays operating mode, temperature or speed setting, watts, GPM and supply and return temperatures Sure Start automatic unblocking mode Bio Barrier filter protects pump from system contaminants. Sensors and Integral Flow Check (IFC) included