1.98% electricity and heat exchange 2.energy saving, noiseless,not dry ... panel heaters are widely used in room, hotel, and shops, schools, hospital, garden house, vegetable patches, ... gas station ect.They are popular in winter and places requiring constant temperature. 2.Work Theory (1 ... noiseless,not dry(5).far infrared, more healthy and comfortable(6).good looking pictures: design any pictures ...