Burnham Commercial has introduced the RTC Return Temperature Control, providing boiler protection from thermal shock and sustained condensing operation. The RTC monitors the boiler return water temperature and operates a three-way diverting valve and boiler circulator to maintain a minimum return temperature of 135°F or greater. The RTC kit provides set point control, outdoor reset, and an LCD display to monitor and regulate return water temperature. It also counts boiler run time and the number of boiler cycles, and provides built-in off-season pump and valve exerciser. Burnham Commercial. Circle 16.