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Boilers; Domestic boilers; Heating boilers; Central heating boilers; Gas boilers for central heating; Gas boilers [other than parts of machines]; Biomass, diesel, diathermic oil and superheated water boilers; Heat exchangers; Heat pumps in individual form or in integrated systems; Apparatus for accounting for and distributing energy in buildings, namely heat cost allocators (parts for heating and air conditioning installations); Room heaters; Air heating installations; Gas fired space heating apparatus; Boilers being parts of central heating installations; Air conditioning fans; Solar thermal collectors [heating]; Solar thermal collectors [heating]; Radiant linear heating systems; Equipment for heating, ventilating, air conditioning and air purification (for indoor use), HVAC (heating, ventilating and air conditioning) systems; Apparatus for lighting, heating and steam generating, de-aerators (parts for heating and air conditioning installations); Economisers (parts for heating and air conditioning installations); Collection and cooling condenser tanks (parts for heating and air conditioning installations); Apparatus for cooking, refrigerating, drying, ventilating, water supply and sanitary purposes