WT-20 2 channel wireless heating and hot water internet thermostat can be a convenient solution for controlling combi boiler with a seperate water tank. This smart thermostats typically connect wirelessly to the heat system, allowing you to control and monitor the temperature settings remotely through a smartphone app.       Large LCD Display with tempered glass design       Multiple modes control(Manual,Economy and PRG. Mode)      Wireless heating & Hot Water Control        7 days Programmable (4 periods/day)      Child Lock       Open Window Detection      Frost protection      CE, ROHS approved      2.4Ghz Tuya Smart Life APP