11 Heating devices, namely, central heating installations, including steam generating installations; cooking devices, namely, ovens; refrigerating devices, namely, refrigerating machines; ventilating devices, namely, oven ventilation hoods; and water conduits in the nature of sinks and water conduits devices, namely, bath tubs; solar collectors and internal tube collectors in the nature of heat registers; underfloor heating systems comprising heating boilers and pipes therefor; flat-plate and tube heating collectors; solar ovens; solar accumulators; heat pumps; heat accumulators; heat exchangers; plumbing fittings, namely, bibs, cocks, traps, valves; heat pipes and fittings, namely, heat pumps for underfloor heating installations; bathtubs and shower tubs of plastics as well as accessories thereof, namely, shower trays, shower heads; shower fittings, namely, shower panels and platforms; fans, namely, electric fans, ceiling fans