Abstract: An electronically controlled space heater includes a ceramic block heating element fed by a metering pump with fixed volume charges of liquid fuel at a rate dependent on temperature requirements. The heating element is located within a combustion chamber. Exhaust gases vented from the combustion chamber are applied directly to a thermocouple whose voltage output is utilized to vary or maintain the frequency of a pulse circuit driving the metering pump. An operator-adjustable potentiometer functions as a thermostat to establish a desired temperature reference value to which the thermocouple output is continuously compared. Start-up and shutdown circuitry precludes the development of unsafe operating conditions.