I mentioned in an article last summer that most Israelis have solar water heaters on their rooftops, and thus they save a lot of energy during the summer. In fact, the idea of heating the water in a boiler is not new, I had more than a dozen showers in my grandparents’ backyard, during some hot summer days in my childhood.

One simple way of making water hot has been perfected by a blogger on thesietch.org, and it relies on a simple and easy to find piece of junk: an old refrigerator!

Other components are: wood, for making a frame, glass (not plexiglass), hoses, a rubber door mat, a reflexive aluminum foil, scotch tape and glue, or silicon. Eventually, you’re going to need some screws.

Because it’s black, the refrigerator radiator heats faster than other materials. This also happens because of its tightness. The inventors who made this “instant” solar water heater want to make another one, that transports the water by thermal convection and recycle it, until it reaches the desired temperature.

The entire solar water heater project costs less than $5 and can save you of a lot of electricity, reflected on your bill.

It’s easy to do. You may go to their site or watch the gallery below, because it’s self-explanatory:

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