This may be off topic but WHY would a space heater be used outdoors, let alone under a pair of fuel tanks??? My guess would be to try to keep them warm OR they wanted them to burn... "Pilotless electric ignition" comes to mind [Linked Image]

Anyway that looks like quite the cooker, but at least it was outside when it self destructed!

That breaker, I have seen them at my old elementary school, they were those old "piggyback" style. They used them as switches---> in all the classrooms to protect AND control all the lights, outlets and fans.
A.D