Immersion type controllers used to limit or regulate temperatures of water and other liquids in boilers and storage tanks, high and low limit and circulator control in hydronic heating systems. Sensing element (3/8 x 3″) inserts horizontally into immersion well (not included). All models except L6006A1012 include well adapter and heat conductive compound. Model L6006A1145 includes special adapter bracket to allow sensing bulb to insert horizontally or vertically into immersion well. Electrical rating: 8 amps @ 120v, 1.3 amps @ 240v.