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Installation, assembly and fixing materials made of metal for solar collectors, photovoltaic modules and systems; valves of metal (other than parts of machines) including those from alloy steel and titanium; ducts of metal for ventilating and air conditioning installations; metal pipes. Optical and electro-technical instruments, namely control units and control devices; surveying, nautical, weighing, signalling, measuring and surveying apparatuses; fuel cells; solar cells for electricity generation; photovoltaic systems consisting of solar modules for electricity generation, photovoltaic inverters, electric apparatus and instruments for controlling, regulating, capturing and monitoring; converters, electric and inverters, in particular for photovoltaic systems or fuel cells; power generating systems and equipment with fuel cells or photovoltaic modules as energy source, included in this class; glass covered with an electric conductor; control and regulation equipment, included in this class; remote control devices; display units (electrical); anodes. Heaters, especially electric heaters; refrigerating apparatus; dryer and ventilation units; fittings for heating systems, thermally and/or electrically operated, except measuring devices; fittings for water pipes made of metal, metal alloys or plastic; taps [faucets]; water conduits installations; thermostatic valves [parts of heating installations]; coils [parts of distilling, heating or cooling installations]; instantaneous water heaters; heating flanges; water boiling devices; hot water tanks; pressure water tanks; water heaters; electrical hand dryers; towel dryers (heating); electrical heating apparatus and installations; electrical storage heaters for central or decentralized installation; heaters for defrosting; central heating systems and components therefore, included in this class; stoves [heating apparatus]; heaters for solid, liquid or gaseous fuels; electric space heating apparatus for household use; air conditioners and systems; air humidification and air dehumidification devices and air dryers; air filters (air conditioning) and air filter systems; ventilation [air conditioning] installations and apparatus; heat pumps; heat exchangers and heat regenerators; brine distributors (parts of heating systems); solar-powered cooling equipment, in particular adsorption and absorption heat pumps; solar collectors for heating; heating flues and pipes for heating boilers; brackets for gas burners; heating boilers; burners; heating equipment operated by fuel cells; filters and filtering devices for domestic or commercial systems, in particular for drinking water; refrigerators and refrigerating installations; water treatment equipment; devices and systems for water softening and for the protection against limescale build-up; water supply and distribution systems and apparatus; refrigerated beverage dispensing units [other than vending units]; control and safety accessories for water or gas equipment and for water or gas pipes.