http://www.inhabitat.com/2009/03/23/the-ecodrain-cuts-water-heater-use-by-40/
The EcoDrain: heat exchanger to capture the wasted heat (not water!) that goes down the plughole.
http://www.inhabitat.com/2009/03/23/the-ecodrain-cuts-water-heater-use-by-40/
The EcoDrain: heat exchanger to capture the wasted heat (not water!) that goes down the plughole.