Adopting internationally most advanced microcomputer control chip, W9800 series digital heating thermostat detects temperature through the high-precision sensor inside or outside the thermostat, and compares the detected temperature to the parameters set by users in real time, automatically turns on and off the heating equipment, so as to keep constant indoor temperature. It can set six time intervals and corresponding temperatures each day, with manual control and temporary manual control available for choosing. Its unique dual-temperature dual-control function allows for temperature detection of heating equipment at the time of detecting room temperature, when the temperature of heating equipment is higher than the maximum set temperature, the thermostat will automatically stop heating to protect electric heating equipment; when the indoor temperature is lower than the minimum protection temperature, it will start the electric heating equipment to enable the heating equipment to work under proper temperature, so as to extend the service life of the equipment and make the system safer, more reliable and energy-efficient.