Regulates supply water temperature from two-stage boiler system. The PC702 Two Stage Boiler Reset Control is a microprocessor-based control designed to regulate the supply water temperature from a two-stage boiler system based on the outdoor temperature or domestic hot water requirements. The PC702 Two Stage Boiler Reset Control offers all the features of the PC700 and in addition includes an adjustable inter-stage relay setting, boiler staging using proportional, integral and derivative (PID) logic, optional boiler rotation and a domestic hot water demand output.