no worries, i still have 2 running here at home, winter is coming in and these space heaters were pretty well designed to be no-hassle miners.
I actually run mine using an EVGA 1600 80+ which may seem a bit excessive, but while I wait for my SP20 to arrive, i might as well put it to use! lol

normally I just run 1 x BFL single on a CM500.

the better rated PSU you use, the better efficiency (at the wall) you will get.

best luck with your mining endeavours!