Eliminating 120 A.C. Power cords whenever possible is a good idea. Most low voltage transformers will burn out before they burn up. I've been wondering if anyone is working on a D.C. Tank heater, or some kind of power other than 120 A.C. Unfortunately household electgricity can start a fire without ever tripping the breaker. Ironically Thomas Edison said that A.C. Was too dangerous for the household and advocated D.C. Only. Then he has one of the largest A.C. Suppliers named after him. Of course A.C. Was chosen because it was cheaper. How much is a human life really worth?