CPV code 45232141 designates Heating works in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
45232141 is a leaf code — the most specific level of its branch — so it can be used directly as the main CPV code of a contract notice. If it does not quite fit, check the neighbouring codes under 45232140 (District-heating mains construction work).