Last year, we noted a device called the GFX that recovered heat from drainwater. This device has been re-dubbed the Power-Pipe, and it was recently launched in a "coil cutting" ceremony in Canada. The Power-Pipe is made of copper, and works by efficiently transferring heat from the falling film of warm drain water on the inside of the pipe to the cold fresh water flowing in the outer coils. "With the residential installation of the pipe, the typical water temperature rise would be from 10 degrees Celsius to 25 degrees Celsius," says the inventor, Gerald Van Decker. As a result, less energy is used to heat household water. Customers save 25 to 40 per cent on their energy bills and the environmental impact is decreased. In residential use, it increases your water heating capacity so you won't run out of hot water in the shower.In terms of "green energy," drain water heat recovery is less glamorous than its well-lauded cousins solar energy and wind power, but Gerald is committed to the smart, energy savings it offers customers and its impact on the environment. "The Power-Pipe saves as much on domestic water consumption as a single solar heating system, at about a quarter of the cost," he says. "It has no moving parts, requires no maintenance and will last over 50 years."