6
Structures of metal; Buildings of metal; Reservoirs (metal -) [structures]; Liquid storage tanks [structures] made of metal; Tanks of metal; Water tanks of metal; Metal fluid storage tanks; Metal cylinders for compressed gas or liquids [empty]; Frames of metal for building; Framework of metal for building; Storage containers of metal; Liquid storage tanks [containers] made of metal
11
Water cisterns; Hot water installations; Heating installations [water]; Boilers for hot water supply installations; Cylinders for the heating of water; Hot water cylinders; Water heaters and boilers; Solar water heaters; Instantaneous water heaters; Bathroom heaters; Solar thermal collectors [heating]; Electrically heated hot water tanks; Water distributor armatures for heating; Hot water heaters; Thermal storage instruments [solar energy] for heating; Hot water apparatus; Solar energy powered heating installations; Sunlight collecting apparatus for heating purposes; Wash boilers; Evacuated heat pipe solar collectors [heat exchangers]
35
Retail services in relation to heating equipment; Wholesale services in relation to heating equipment; Wholesale services in relation to water supply equipment; Retail services in relation to water supply equipment
37
Installation of solar heating systems; Heating equipment installation and repair; Maintenance and repair of heating apparatus; Maintenance and repair of heating; Maintenance and repair of solar heating installations; Installation, repair and maintenance of heating equipment; Installation of solar powered systems; Maintenance and repair of storage tanks; Providing information relating to the repair or maintenance of storage tanks