The urban sewage and domestic/industrial used water heat pump (HP) technology has attracted interest in recent years [1]. This recovery application aims to reduce energy consumption of buildings, and provides a new energy source through a HP application using wastewater (WW) because space heating and cooling, and domestic hot water supply represent the biggest share in energy consumed by residential buildings [2]. WW in urban sewage and buildings retains a significant portion of its energy, and recycling the energy in these heat sinks is the essential phenomenon in developing waste water heat exchangers (WWHEX) [3]. Swiss researchesreported that more than 15% thermal energy supplied to buildingswas lost through the sewer system [4]. To recover this energy, various types of heat exchangers (HEX) can be developed according to the area of use like domestic, sewage, filtered sewage, etc. In recent years, an increasing amount of research has been pursuedfor heat recovery using WWHEXs. In the present study, varioustypes of HEXs used in both large scale WWHEX facility and sci-entific studies are reviewed to provide a general understanding ofthe developments in this field.