Smart wireless thermostats to let user to transform home heat generating devices such as boiler, manifold,radiator, fan coil into an intelligent and energy saving system. APP shows how many heat generating devices and associated thermostats are installed. APP also shows what the room temperature and set temperature of each thermostat as well as whether heating device has been activated or not. User can operate APP to set up desired temperature and to preset time to warm up on each thermostat before back home