Hydronic system heating and cooling digital controller. The SMT-400 Wi-Fi Thermostat is designed for residential and commercial applications and has new features not previously found in wall thermostats. Wire the optional outdoor air sensor and duct dampers directly to the SMT-400 Thermostat to enable full economy cycle cooling. Control your heating and cooling system remotely using the SMT-400 App for IOS /Android App. Note this price may change prior to the new listing. Price includes GST, postage and handling within Australia.*