Computime�۪s CTL218 is a programmable thermostat that interfaces with Smart Energy networks. The CTW 218 can be programmed from the front panel or through the ZigBee network. It supports DRLC, Price and Message Clusters of Smart Energy Profile, and the Thermostat, Thermostat Interface and Fan Home Automation clusters. It supports all standard HVAC systems and two stage heat pumps. The CTW218 supports 3H2C HVAC system.