energies is by utilizing the heat generated from burning a mixture of spirit fuel and used cooking oil in a burner where later the hot temperature generated from burning the fuel mixture is changed using a thermoelectric to alternative energy. Research has been carried out, namely measuring the temperature of the burner chamber and the physical properties of the mixture of spiritus fuel and used cooking oil, and the results of measuring the temperature of the highest burner chamber in a mixture of 100% spiritus+ 0% used cooking oil can be seen that the temperature of the burner chamber reaches 98 °C at the effect of the flame time is 3 minutes, and the lowest burner combustion chamber temperature results in a mixture of 20% spiritus+ 80% used cooking oil, which reaches a temperature value of 42 °C with the effect of a flame time of 1 minute. In measuring the physical properties of the fuel mixture, the highest density value was 1.138 gr/ml in a mixture of 20% spiritus 80% used cooking oil and the lowest density value was 0.80 gr/ml in a mixture of 100% spiritus+ 0% used cooking oil.

Keyword: Spirtus, used cooking oil, temperature, physical properties, combustion