optimus 123I saw a 123123R with a candle flame on the filler cap. I had been called over to fure out why it had a weak flame. I got the cap off and the fuel was boiling. TheOptimus 123 er jo bombesikker. Svært få deler og enkel i bruk. Output er vel ca 1400 watt og brenner kanskje 50 minutter på 1 tank. . 442 er noe mer kompleks,