Electric-Gas room heater 1. two using, Electric and gas 2. ODS and anti-tilt safe device 3. flameout protection ... box is optional Specification: three electrical heating tube, brass valve, High-quality burner, flameout protection device, 3 CERAMIC PLATES, THREE POWER SETTING ... / 13KGLoading(20'/40'/40'HQ):210/ 420/ 505 sets Electric-Gas room heater