11 Vehicle heating, ventilating apparatus, accessories for the aforesaid goods, namely, burners, filters, gas lighters, gas condensers (other than parts of machines), air conduction elements, regulating devices for gas apparatus, pipelines, heat exchangers, air intake and exhaust ducts, silencers and contact-proof devices, specially adapted for vehicle heating and ventilating apparatus; heating elements; electrical heating apparatus; electrical heating installations; apparatus for lighting, heating and drying, and heating systems, in particular for gaseous and liquid fuels, and valves and fittings therefor; fans and air blowers for ventilating and heating installations, in particular for such installations in vehicles; water heaters; water heaters operated with gaseous or liquid fuels; water filters, water treatment plants, water distribution installations, conduits for sanitary installations, water conduit installations; fittings for gas installations, gas lamps and oil installations; gas and oil burners, including for industrial furnaces; gas pipelines and oil pipelines being parts for gas and oil installations, fittings for gas pipelines and oil pipelines; regulating apparatus for gas pipe installations, in particular for use in camping and vehicles; gas fittings, gas and oil burners, including for industrial furnaces; regulating and safety accessories for water or gas apparatus and pipes; relief valves and level controlling valves for gas, water and oil tanks; thermostatic valves; level meters for gas cylinders; all the aforesaid goods being for caravans, motorhomes, boats, commercial vehicles and mobile homes, but not for cars, trucks and household equipment and not for calculating air conditioning, heating, energy, heat, water, gas, electricity and sewage costs or for calculating domestic ancillary costs in the field of real estate; all the aforesaid goods for the heating sector