Trs Systems' RC2100 Steam/Hot Water Control System utilizes spread spectrum wireless techology to provide control in multi-tenant steam or hot water heating applications. The controller cycles the boiler based on the averaged input of up to twelve wireless space temperature sensors and the wireless outdoor air sensor. The intelligent algorithm allows the RC2100 controller to de-select specific sensors if their temperature is out of the reasonable range. The boiler can not be activated until the outdoor air temperature falls below an adjustable lockout setpoint. An internal time clock allows for temperature setback during night or unoccupied hours. The controller can be monitored remotely using Trs Systems' Sensor View Software.