A heat trace system for heating vessels (18, 20) of a piping system, the heat trace system comprising: a main power distribution and control unit that comprises: an electrical power source; a wireless communication gateway; a front-end controller in communication with wireless communication gateway; a plurality of heat trace cables, wherein each heat trace cable is adjacent to a vessel (18, 20) of the piping system; and a plurality of wireless field devices, wherein each of the plurality of wireless field devices comprises: an RF module for communicating with the wireless communication gateway of the main power distribution and control unit via a wireless communication network; characterized in that each of the plurality of wireless field devices further comprises: a power control device having an input connected to the electrical power source of the main power distribution and control unit, and having an output connected to an associated heat trace cable of the plurality of heat trace cables, such that when the power control device is ON, the associated heat trace cable conducts current from the electrical power source of the main power distribution and control unit; and a field device controller in communication with the RF module and the power control device, wherein the field device controller is for controlling the power control device based on control data sent from the front end controller of the main power distribution and control unit via the wireless communication network to the wireless field device and received by the RF module. a main power distribution and control unit that comprises: an electrical power source; a wireless communication gateway; a front-end controller in communication with wireless communication gateway; an electrical power source; a wireless communication gateway; a front-end controller in communication with wireless communication gateway; a plurality of heat trace cables, wherein each heat trace cable is adjacent to a vessel (18, 20) of the piping system; and a plurality of wireless field devices, wherein each of the plurality of wireless field devices comprises: an RF module for communicating with the wireless communication gateway of the main power distribution and control unit via a wireless communication network; characterized in that each of the plurality of wireless field devices further comprises: a power control device having an input connected to the electrical power source of the main power distribution and control unit, and having an output connected to an associated heat trace cable of the plurality of heat trace cables, such that when the power control device is ON, the associated heat trace cable conducts current from the electrical power source of the main power distribution and control unit; and a field device controller in communication with the RF module and the power control device, wherein the field device controller is for controlling the power control device based on control data sent from the front end controller of the main power distribution and control unit via the wireless communication network to the wireless field device and received by the RF module. an RF module for communicating with the wireless communication gateway of the main power distribution and control unit via a wireless communication network; characterized in that each of the plurality of wireless field devices further comprises: a power control device having an input connected to the electrical power source of the main power distribution and control unit, and having an output connected to an associated heat trace cable of the plurality of heat trace cables, such that when the power control device is ON, the associated heat trace cable conducts current from the electrical power source of the main power distribution and control unit; and a field device controller in communication with the RF module and the power control device, wherein the field device controller is for controlling the power control device based on control data sent from the front end controller of the main power distribution and control unit via the wireless communication network to the wireless field device and received by the RF module. a power control device having an input connected to the electrical power source of the main power distribution and control unit, and having an output connected to an associated heat trace cable of the plurality of heat trace cables, such that when the power control device is ON, the associated heat trace cable conducts current from the electrical power source of the main power distribution and control unit; and a field device controller in communication with the RF module and the power control device, wherein the field device controller is for controlling the power control device based on control data sent from the front end controller of the main power distribution and control unit via the wireless communication network to the wireless field device and received by the RF module.