Wholesale and retail sales of air conditioning apparatus, water heaters, hot water supply systems and installations, heat pumps, solar panels and collectors, apparatus for heating, cooling, ventilating and air-conditioning, air conditioning and air cooling systems and installations, central heating systems and installations, hydronic heating and cooling systems, heat exchangers, evaporators and condensers, heat exchanger plates and panels, fans for ventilation and air conditioning, hot water tanks, radiators, parts, accessories and fittings for all the aforementioned goods