Heating and steam generating apparatus, namely, steam generators, steam heating apparatus; stoves, namely, electric stoves, gas stoves, oil stoves; central heating boilers in the nature of furnace boilers; electrical boilers; heat exchangers; steam radiators for central heating in buildings, hot water heaters, radiators, heat pumps, electrical water boilers, solar collectors; evaporative air cooling units for domestic use; air conditioners, electric window fans; ventilators for domestic use; ...