104306 Bell & Gossett Ecocirc XL 55-45 Large Wet Rotor Circulator with 1/2 horsepower, 208-230/1/60. The newly expanded ecocirc XL line, with single and three phase motor options, gives you a highly efficient circulator that enhances commercial hydronics systems with superior quality and dependability. State-of-the-art hydraulics, advanced motor design, intelligent controls, and smart communication capabilities highlight expert engineering across a broad range of HVAC and plumbing applications.