the "help" on gas burners is misleading. due to heat sink's 5%loss per tick, a heat sink can compensate for slightly under 500k heat per tick by itself. then plug boilers to milk that thing. but it won't explode until the burner exceeds 500k
the end was anticlimatic.
i was switching between tabs, always doing some reading after completing a level. then i got back and search for the "next level" button when i suddenly notice "you have completed the game"