Electric water heaters; solar collectors for heating; solar heating installations; gas boilers for water heating; apparatus for producing hot water; apparatus for the supply of hot water; apparatus for water heating; cylinders for the heating of water; electrical water heating apparatus for making beverages; electrically heated hot water tanks; gas fired boilers for producing domestic hot water; gas fired water heaters; hot water boilers for beverage making; hot water cylinders; hot water heaters; hot water heating installations; installations for the heating of water; pressurised water installations; heat pumps; solar energy collectors for heating; solar energy powered heating installations; solar panels for use in heating