The thing with these is, you can take *nothing* for granted.

I recently did a "winterized" foreclosure where I badly burned the back of my hand when it brushed up against the boiler's circulating pump - the power switch to the boiler was installed upside down, and the pump had been running dry for two months. (My IR thermometer read the temp at the impeller housing at 372F).

Then the burners on the (drained down) water heater kicked in...