CWNS automatic biogas hot-water boiler, used three returns internal combustion installation, has compact structure and nice appearance. Matching the automatic biogas burners our company produced, the thermal efficiency of combustion can reach up to 90%. The dust emission accord with the requirements of the Class I areas(scenic reserve) of the State Environmental Protection Product characteristics: 1,Matching the automatic biogas burners our company produced, can ignite automatically, combust fully, reach the standard. 2,The combustion process controlled automatically, the high and low temperature has automatic interlocking protection, can working security and reliable. 3,Is complete machines when leave company, has compact structure, is easy to install.