One reputation. If you’ve been searching for a reliable 3-speed circulator, search no more. Our Radiant and Service 3-speed pumps are built to the exacting standards you’ve come to expect from Taco. The 00R 3-Speed Radiant Pump. Heavy duty reliability. Everything that goes into the 3-Speed Radiant Pump – from the powerful, high performance motor to the durable 3-speed switch – says “heavy duty”.