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Both practical and environmentally friendly, heat recovery systems are used to reclaim heat from outbound air and liquid in different systems. This is typically accomplished through some type of heat exchanger and allows for far greater system efficiency by saving power that would otherwise be lost. In this respect, heat recovery systems fit into numerous “green” planning strategies, as they add yet another energy saving component to an operation.

In general, heat recovery devices are used in ventilation systems and certain boilers and water heaters, as well as in larger systems that generate hot waste water. Drain water recovery systems are typically used in homes, often in conjunction with standard or solar water heaters. Drain water, also referred to as graywater, holds up to ninety percent of the heat energy produced by a system, so even recovering a small fraction can greatly increase system efficiency. By directing a stream of cold water through a system of heat-conductive coils wrapped around the drainage pipe, some of this heat can be reclaimed. The drain-water heated water is then added to the existing hot water tank, where it is stored for use. Typically, heat exchanging tubes are made of copper due to its exceptional heat conductivity and arranged in tight coils around the drain pipe.

Heat recovery systems are also used to reclaim heat from air outflow in ventilation systems. Heat recovery ventilators, also known as HRVs, reclaim heat from exhaust and bring new air into the area. In cold weather, these systems are particularly effective, as they heat incoming cold air with excess, heated air. During warm weather, heat exchange functions can be bypassed in order to keep cooler air coming into the facility without being heated; in some HRV systems, incoming air can be cooled by cooler outgoing air. Heat recovery ventilators can be attached to existing systems, often with little trouble, provided there is space available. Additionally, they can be used in conjunction with other energy recovery systems (for humidity) to drastically improve the quality of air in a facility.