What is the definition of voltage at thermostat? Voltage at thermostat is the voltage of an electrical circuit at the thermostat. This voltage is used to control the temperature of the thermostat. It is the voltage used to power the heating element of the thermostat. The voltage at thermostat can vary depending on the model and design of the thermostat. Generally, the voltage at thermostat is around 24 volts. This is the safest voltage for a heating element and is typically used for most standard thermostats. If the thermostat is designed to run on a higher voltage, such as 240 volts, then the voltage must be specified in the instructions. The voltage at thermostat is important because it must be sufficient to power the heating element of the thermostat. Too low of a voltage could cause the heating element to not heat properly, or it could even cause the heating element to overheat and potentially cause a fire. Too high of