Green Hot Water

Green as in environmentally friendly, that is.
As American colleges and universities continue their efforts to save both money and the environment, they should take a peek at a new idea in Canada.
Administrators at the University of Waterloo have retrofit some student housing units with Power-Pipe Drain Water Heat Recovery systems from Renewability Energy.
The system uses waste water to preheat fresh water before the fresh water passes through a traditional water heater. In case that sounds icky, don't worry, the heat exchange is achieved through a double walled pipe construction that ensures the waters don't mix. You can watch a promo video on YouTube explaining the technology here.
The company says the system can result in up to a 9 percent energy savings.
In the effort to squeeze a much "green" technology onto campus as possible, hot water could be the next frontier.