They operate a little just like a fridge-freezer, but in reverse. The intelligent technologies works by using electricity to get heat through the air exterior – even if temperatures get as low as -15C! “With furnaces, we’re used to the furnace approaching, creating the space warm, then it turns off https://industrial-waste-heat-rec34556.blogoscience.com/35366742/industrial-waste-heat-recovery-for-dummies