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Tidbit #5: a guessing game
Try to guess the number of Hazards in the following scenario:
People call because it smelled "gassy" in their house, then smelled like electrical wires burning, and now they HAVE NO HEAT.
Propane Boiler is about 50 years old, located in a four-foot crawlspace accessed by old-time cellar door cover where you crawl down a couple steps. Totally full of mud, a little water here and there. Slither back to the boiler, find a five-gallon bucket sunk in the mud next to the boiler, with an electrical outlet over the top of it, and a disconnected garden hose leading outside. Wires inside the boiler jacket and the aquastat, gas valve, etc, are all charred; not much insulation left. Old cloth-covered wire with a tiny aluminum ground feeds this beast, and is spliced with tape into other circuits. So I crawls back out and find the panel, maybe two fuses and a switch. Slither back down, gotta run an extension cord from the garage now for light, and find that the water line had risen to just above the top of the burners, but not to the pilot! So the gas would bubble out of the water and burn here, there, anywhere. Seems as though the heat exchanger was completely plugged with soot, as well, so not too much flame was actually going thru the heat exchanger. Luckily the crawlspace was not too airtight.