>I wonder why my fridge, aircon, and stove aren't "pre heating" the cold water going into my hot water heater? I asked the CEO of SunFrost (who make super-effi

>I wonder why my fridge, aircon, and stove aren't "pre heating" the cold water going into my hot water heater? I asked the CEO of SunFrost (who make super-efficient fridges for solar houses) whether he had examined the possibility of a water-cooled refrigerator. He said that people didn't want to pay a plumber to install and remove their refrigerator, and that the lifetime savings doesn't really pay for the extra time and hardware.