back in the day,before all this fancy heating stuff was available,i used a large mayo jar full of water with an aquarium heater in it,Ithought of this when i found a bunch of these heaters in the attic.well the wheels are turning and im thinking a five gallon fish tank with a few heaters in it just might be an excellent night time heater,this is a baby stage thougt,just wondering if anyone has some input on this idea? thanks john