Wall-hung gas boiler supplying heating or sanitary hot water for domestic application. * Ninefold protection. Excellent safety. * Heating and sanitary hot water temperature is input digitally. * Heating water and sanitary hot water is divided and temperature can be set freely. Priority on sanitary hot water. * Constant temperature: It is designed special flow stabilized mount for sanitary hot water system. * Energy-saving: The thermal efficiency can reach above 90% by using intelligent room temperature controller. * Safety: With close gas supply and exhaust design, gets fresh air for combustion from outdoor and the waste gas is exhausted outdoor. * Environment friendly: The CO content in the waste gas is lower than 0. 01% . * With close waterway design and built-in expansion water tank.