A gas powered incineration toilet is disclosed with a burner of the premixed full air type. The burner (9) includes an outer air chamber (20) which is closed at a first end and has a first exit for combustion air at a second end and which is connected with a channel (17) for supply of air, an inner gas mixing chamber (21) of smaller diameter than the outer chamber (20), which has at least one opening (22) proximate a first end for supply of air and a second exit for combustion gases at a second end, as well as a nozzle (16) for supply of air, as there is provided at least one backfire prevention system (23, 24, 25) in the form of a perforated plate and/or screen at the second combustion gas exit.