harry k wrote:

-snip-
I am about the same. Here is one I bet noone thinks of.

I store my butane camp lantern in the basement along with the fuel
canisters. Last year I had to use it during an extended power outage
(about 2 hours). Started with a fresh canister. Power outage over, I
removed the canister. Next time I went to use it, the canister was
totally empty. Obviously the valve had not totally sealed and all the
remaining fuel leaked off.

I keep 3-4 1lb propane tanks for torches, lights & a camp stove. They
get stored in my basement right above an outlet to the cellar drain.
I doubt a pound of propane would make much of a boom if one leaked-
but if it does, the path is clear for it to go to the outside without
passing any source of ignition. [remember propane is heavier than air,
so it sinks- unlike natural gas]

Jim