11 Burners, boilers and heating apparatus, in particular heating boilers for oil, gas and solid fuels; fuel cell heating apparatus, namely, oxygen concentrators for use with fuel cells; heat pumps, solar energy powered heating installations, storage water heaters, industrial boilers and the aforementioned goods for biomass cogeneration plants; industrial installations for processing biogas in the nature of biogas fermentation reactors, namely, percolating fermenters and dry fermenters; refrigerating and freezing equipment, in particular air and water cooling installations, refrigerating chambers, freezer cabinets, refrigerating cabinets and refrigerated counters; heating, ventilating, and air conditioning and air purification equipment, namely, heating installations, ventilating fans for household, commercial and industrial use, air conditioning apparatus and installations, air purification units; water supply and sanitation equipment, namely, water purification apparatus and installations, water purifiers for household purposes, water filtering apparatus; and parts and fittings of all the aforesaid goods