A digital thermostat for heat only is a device that is used to regulate the temperature of a space by controlling the operation of a heating system. It works by measuring the temperature of the space and then sending a signal to the heating system to turn on or off depending on the desired temperature. Digital thermostats for heat only are typically more accurate than traditional thermostats, as they can be programmed to maintain a specific temperature. They are also more energy efficient, as they can be set to turn off the heating system when the desired temperature is reached. Additionally, digital thermostats for heat only can be set to turn on the heating system at a specific time, allowing users to save energy by pre-heating or cooling a space before it is occupied.