How and Structure of RSR Stove Burning Works: Blowback
When combustion rises the temperature of the enclosure, and the expansion pressure of the alcohol vapor in the fuel vapor exceeds the appropriate value, the alcohol vapor returns to the fuel tank through the return channels to the fuel tank. Therefore, it has high fire power, but there is no need to worry about exploding due to abnormal rises of internal pressure like pressurized alcohol stoves with the same high flame power.