Patent ID: 6718889
Filing Date: 2004-04-13
Classification: F23G

Abstract:
A boiler assembly comprising:a) a multi-walled firebox enclosing a space for burning combustible solid fuels and having a first source of combustion air coupled to said firebox; b) a burner assembly mounted to direct flame into said firebox and coupled to a source of liquid or gaseous fuel and in communication with a second source of combustion air and including a conduit having a bore in communication with said second source of combustion air and mounted to direct flame into said firebox and wherein said conduit includes a plate mounted to pivot in said bore and coupled to a motorized drive linkage; c) control means for controlling the combustion of said liquid and gaseous fuels at said burner assembly relative to the combustion of said solid fuels and for operating said plate to prevent the flow of combustion air from said second source into said firebox when said burner assembly is non-operational; and d) a liquid heat exchanger coupled to said firebox to extract heat from said firebox and heat a liquid medium.