The SC2000 modular boiler control from Slant/Fin uses computer logic to match system output to building heating requirements. The control step-fires additional boiler modules as needed, based on outdoor temperature, system supply water temperature and indoor air temperature. Computer logic anticipates future needs to prevent firing too many boilers, or to bring more modules on line faster, if required. Control features include enhanced lead-lag, factory-wired panels, plug-in relays, keypad data entry and seven-day programming. Slant/Fin Corp.