Apparatus for producing hot water; Apparatus for supplying water; Apparatus for the distribution of water; Apparatus for the supply of hot water; Boilers for hot water supply installations; Circulators (water heaters); Cylinders for the heating of water; Electric water heaters; Electric water heaters for preparing beverages; Electric water heating apparatus; Electrical appliances for water supply; Electrical installations for water supply; Electrically heated hot water tanks; Gas boilers for water heating; Gas fired boilers for producing domestic hot water; Gas fired water heaters; Heating installations (water); Hot water apparatus; Hot water boilers; Hot water cylinders; Hot water heaters; Hot water heating installations; Hot water installations; Hot water supply heaters; Installations combining boilers and steam generators for producing hot water; Installations for the heating of water; Mixer taps for the manual regulating of water temperature; Pressure relief apparatus for use with water heaters; Pressure relief apparatus forming part of water supply systems; Radiators for hot water installations; Radiators for hot water systems; Room humidifiers that contain water and are placed on central heating radiators; Safety apparatus for controlling the distribution of fluid in hot water installations; Water boilers; Water heaters; Water heaters (apparatus); Water heating apparatus (other than parts of machines); Water heating installations; Water immersion heaters; Evacuated heat pipe solar collectors (heat exchangers); Solar collectors (lighting); Solar energy collectors for heating; Solar energy powered heating apparatus; Solar energy powered heating installations; Solar furnaces; Solar heating apparatus; Solar heating installations; Solar heating panels; Solar panels for use in heating; Solar thermal collectors (heating); Solar thermal collectors for heating; Supports adapted for use with solar heating tubes; Thermal storage apparatus (solar energy) for heating; Thermal storage instruments (solar energy) for heating; Heat pumps for energy processing; Gas boilers; Gas boilers for central heating; Gas boilers for the heating of swimming pools; Electric surface heating tapes; Electrical heating elements; Electrical heating installations; Electrical storage heaters; Storage heaters; Gas heat generators; Heat collectors