11 Heating, steam generating, ventilating and water conduit apparatus as well as sanitary installations, namely, solar water heaters, solar thermal air heaters for heat purposes, solar power cooling units, heating systems composed primarily of tubes, pipes and pre-assembled manifolds through which cold or low temperature water circulates, heating systems for residential and commercial buildings comprised of boilers, valves, pipes, manifolds, solar panels, control panels, switches and electric wire, all sold as a unit, central heating radiators; mechanical apparatus and instruments for water heating, treatment, softening and purification; heating installations in particular water heating installations; electric heating apparatus, namely, central heating radiators; radiators; heating boilers; heat pumps; heat accumulators; heat exchangers; solar collectors for heating applications; water heaters; boilers for heating water; water conduit and water supply installations, namely, meter valves; pressure water tanks; apparatus for air conditioning and cooling, namely, air conditioning installations and apparatus, air humidifiers, refrigerating installations and machines, water cooling installations, in particular open and closed water towers; freezing apparatus and installations; water collection and treatment systems comprising tanks; water supply installations, namely, water purification tanks; water fountains; water extraction and water treatment apparatus, namely, water purification tanks; desalination plants; filters for drinking water; water filtering apparatus; apparatus for the utilization of rainwater and groundwater, namely, apparatus for water supply, water treatment, sprinkling, irrigation and spray irrigation, all aforesaid products used with * submersible motor * pumps, in particular with pressure regulation, with electric regulation and supplies, in particular water purification tanks; water softening apparatus and installations; water purification installations; water sterilizers; water disinfection apparatus; swimming pool chlorinating apparatus; counter current swimming machines for use in swimming pools to enable swimming in place against an adjustable counter current, featuring pumps, motors and adjustable counter current outlets; whirlpool-jet apparatus; installations for waste water purification; waste water treatment installations also using membranes and filters; expansion tanks for central heating installations, namely, hot water tanks; automatic watering installations for agricultural use; chlorination apparatus for swimming pools; insulating shells as parts of heating and water supply installations; steam generating apparatus and installations; filters as parts of household or industrial installations; taps; cooling installations and machines; air cooling apparatus; pipes being parts of sanitary facilities; air cooling apparatus; oil burners for industrial, commercial and domestic use; regulating accessories for water or gas apparatus as well as for water or gas pipes, namely, pressure regulators; safety accessories for water or gas apparatus as well as for water or gas pipes, namely, valves as plumbing fittings, steam valves, valves as parts of radiators, valves as parts of sprinkler systems and manually operated plumbing valves; refrigerating apparatus and installations; thermostatic valves as parts of heating installations; volume expansion automats and automatic pressurizers for heating and cooling water systems, as well as for drinking water and service water installations; water heaters; water conducting fittings, namely, pipes being parts of sanitary facilities; water purifying apparatus and machines