tekmar's Boiler Control 268 is a Multiple Boiler Control that can operate up to nine boiler stages (1-, 2-, 3- or 4-stage boilers). The 268 uses outdoor reset to improve the seasonal fuel efficiency of a system by operating the boilers at the lowest practical temperature. In addition, the control provides equal run time rotation of each boiler to increase the system's service life. Outputs are included for primary pump control and boiler pump control, as well as combustion air or alarm. tekmar Control Systems Ltd. Circle 14.