Heating apparatus, comprising a bracket or lower casing part, a heat exchanger, and a hydraulic group comprising a hydraulic connection body, said hydraulic connection body being on one side connected to the heat exchanger and being on the other side adapted to be connected to an external hydraulic system, wherein the hydraulic connection body comprises a system-side duct (13b; 13c) adapted to be fluidically connected to the external hydraulic system, and an exchanger-side duct connected to the heat exchanger, wherein the hydraulic connection body is a heating delivery body of the hydraulic group, wherein the exchanger-side duct is a water heating inlet duct fluidically connected to an outlet of the heat exchanger, wherein the system-side duct comprises: - a heating water outlet duct adapted to be fluidically connected to an inlet of a heating user system, said heating water outlet duct having a distal end fixed in a through hole obtained in the bracket or lower casing part of the heating apparatus, said distal end being equipped with connection means (13b") for connection to the heating user system, or - a sanitary hot water outlet duct adapted to be fluidically connected to an inlet of a sanitary hot water user system, said sanitary hot water outlet duct having a distal end fixed in a through hole obtained in the bracket or lower casing part of the heating apparatus, said distal end being equipped with connection means (13c") for connection to the sanitary hot water user system, wherein at least one of said ducts (13b; 18; 13c) is formed as a flexible tube at least partially of insulating material, wherein the exchanger-side duct is formed as a flexible tube at least partially of insulating material. a bracket or lower casing part, a heat exchanger, and a hydraulic group comprising a hydraulic connection body, said hydraulic connection body being on one side connected to the heat exchanger and being on the other side adapted to be connected to an external hydraulic system, wherein the hydraulic connection body comprises a system-side duct (13b; 13c) adapted to be fluidically connected to the external hydraulic system, and an exchanger-side duct connected to the heat exchanger, wherein the hydraulic connection body is a heating delivery body of the hydraulic group, wherein the exchanger-side duct is a water heating inlet duct fluidically connected to an outlet of the heat exchanger, wherein the system-side duct comprises: - a heating water outlet duct adapted to be fluidically connected to an inlet of a heating user system, said heating water outlet duct having a distal end fixed in a through hole obtained in the bracket or lower casing part of the heating apparatus, said distal end being equipped with connection means (13b") for connection to the heating user system, or - a sanitary hot water outlet duct adapted to be fluidically connected to an inlet of a sanitary hot water user system, said sanitary hot water outlet duct having a distal end fixed in a through hole obtained in the bracket or lower casing part of the heating apparatus, said distal end being equipped with connection means (13c") for connection to the sanitary hot water user system, - a heating water outlet duct adapted to be fluidically connected to an inlet of a heating user system, said heating water outlet duct having a distal end fixed in a through hole obtained in the bracket or lower casing part of the heating apparatus, said distal end being equipped with connection means (13b") for connection to the heating user system, or - a sanitary hot water outlet duct adapted to be fluidically connected to an inlet of a sanitary hot water user system, said sanitary hot water outlet duct having a distal end fixed in a through hole obtained in the bracket or lower casing part of the heating apparatus, said distal end being equipped with connection means (13c") for connection to the sanitary hot water user system, wherein at least one of said ducts (13b; 18; 13c) is formed as a flexible tube at least partially of insulating material, wherein the exchanger-side duct is formed as a flexible tube at least partially of insulating material.