That 60 gallon tank of hot water in your basement eats up a lot of energy. But tankless on-demand water heaters leave you running water down the drain while you wait for warmth. This tiny Kickstarter water heater promises to change all that, and save you money, thanks to some fascinating technology.
Does the ability to heat eight ounces of water in three seconds interest you? Then take a look at this Teal quick Cup, which produces hot (we're not sure if it's near boiling) water by spinning the cold water you pour in around the spiral heating element. Not only is it fast, it's supposedly more efficient than a…
There's nothing like soaking up some free solar energy, but the biggest barrier to entry has been the expensive devices you'll need, such as solar panels and water heaters. Now you can make your own solar water heater for less than five dollars, and the Instructables site says it's not all that difficult to do.