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A Drain Water Heat Recovery System (DWHR) recovers heat from water that would otherwise be lost down the drain. It works best with simultaneous flows like showers, where there is a demand for hot water at the same time hot water is going down the drain. The recovered heat can be used to preheat cold water going to the hot water tank or for other purposes permitted by codes and regulations.
Actual cost savings are dependent on energy costs, location, system configuration, hot water heater type and water usage. If the hot water is supplied by a 78% efficient natural gas hot water tank, this DHWR unit could recover enough heat to provide up to 15% of the overall hot water needs (about 130 m3 of gas). If the hot water is supplied by a conventional electric hot water tank, this DWHR unit could recover enough heat to provide up to 20% of the overall hot water needs for the household (about 1100 kWh).
Source: CMHC
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