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Water heater products and their parts, gas appliances (excluding installation and maintenance), condensing gas boilers, heating stoves, gas heat pumps, gas equipment, drinking fountains, water purifiers, water treatment equipment, heat pump equipment, new energy equipment, solar photovoltaic equipment , Photovoltaic systems, power equipment, refrigeration equipment (excluding liquid ammonia refrigeration, or only Freon refrigeration), solar energy utilization equipment, low-temperature air source equipment, electric heating equipment, sanitary ware, household appliances and accessories design, research and development, processing, Production, sales, installation, after-sales service, import and export, technology development, technology transfer, technology promotion, technical consulting services, engineering installation of large-scale water heaters, water treatment equipment, electromechanical equipment, photovoltaic equipment, water supply and drainage and heating equipment; steel structure engineering construction , Building engineering construction; pipelines (excluding pressure pipeline engineering construction, excluding the use of long-distance pipelines to transport hazardous chemicals), water, electricity and heating engineering construction; contracting (repairing, testing) power facilities (operating with permits); solar energy utilization equipment , Refrigeration equipment, heat pump equipment contract energy management; house leasing. Involving licensed operation projects, the operation shall be carried out only after obtaining the permission of relevant departments
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