ZHONG SHAN OPTEN ELECTRICAL APPLIANCE CO.,LTD has focused on top quality electric boiler for over 13 years in China. OPTEN has been one of the top producers of Electric boiler and other products, such as: Electric Water Heater, Aqua Bed Warmer. Our product with own patented technology,it is innovate and safety and energy saving. We have acquired ISO900,CCC,CE and IEC certification. Adhering to complete quality inspection system,we are able to produce high quality products consistently