Manufacturing and selling boilers and auxiliary equipment, metal cutting and welding equipment, aluminum alloy products, stainless steel products, and wood products; manufacturing, installing, selling, and repairing atmospheric pressure boilers, boiler accessories, hot air furnaces, heat exchangers, gasifiers, heat exchangers, dust collectors, drying equipment, and temperature control agricultural equipment; selling ground-source heat pumps, air-source heat pumps, gas (oil) heating equipment, condensing gas module boilers, gas wall-hung boilers, solar equipment, electric boilers; research and development, maintenance, and selling general machinery and equipment, electromechanical products, kilns, and automation equipment; water, electricity, and heating installation