Air conditioners, ventilators for domestic and industrial use; air conditioners; air filters for air conditioning units; air purifiers; apparatus for space heating, ventilating and air conditioning; boilers for heating installations; boilers other than parts of machines, namely, electric boilers, furnace boilers, heating boilers; boilers; burners; gas boilers for heating; gas burner for water heater; gas burners; gas water heaters for household purposes; gas water heaters; heat pumps; heaters; heating and cooling apparatus using heating pump; heating apparatus using gas furnace; heating boilers for household purposes; heating boilers; heating elements for heating; heating furnaces; hot water distributors being hot water heating installations; hot water heaters; hot-air heating apparatus; hot-water space heating apparatus; HVAC systems being HVAC units; instant water heaters