Production and distribution of steam, hot and cold water and cooled air through mains

Title: Production and distribution of steam, hot and cold water and cold air through ducts It comprises the production, capture and distribution of steam and hot water for heating, driving force and other purposes. Includes the production and distribution of cold water for cooling and air refrigeration and thermal energy storage. Does not include:  Water collection, treatment and distribution (36);  Heat/steam production by waste conversion (38220);