Drainline Heat Exchangers

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This simple system for recovering heat from wastewater makes a lot of sense — especially for homes and commercial buildings that use a lot of hot water

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[](http://www.greenbuildingadvisor.com/blogs/dept/energy-solutions/drainline-heat-exchangers)

Over the past few weeks I've written about various strategies to produce hot water efficiently. We've seen that tankless water heaters are more efficient than storage water heaters (though are not without their drawbacks), and we've learned that heat-pump water heaters produce two to three times as much heat per unit of electricity consumed as electric water heaters that rely on electric resistance heat.

URL: http://www.greenbuildingadvisor.com/blogs/dept/energy-solutions/drainline-heat-exchangers