Abstract: An incinerator for combustible waste materials including a combustion chamber having a side charging entrance with a base no lower than the mid-plane of the combustion chamber. A ram moves waste materials in an elongated hopper connected to the side charging door into the combustion chamber. A fire door is raised to open the charging entrance and lowered to seal the charging entrance. An elevator positioned under the hopper is charged with waste materials and raised to the level of the hopper until the platform of the elevator becomes the bottom of the hopper on a horizontal level with the base of the charging entrance. An after burner unit can be positioned over the combustion chamber. A heat recovery unit is positioned over the after burner to recover heat from the combustion for use in an outside heating unit.