How to Make a $5 Solar Water Heater From Junk Fridge


backoffridgeI 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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karl
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karl

Go to garys builditsolar website to see the black bucket in a glazed box that I built. 4 gallons of hot water every sunny day.

homeschoolscienceteacher
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homeschoolscienceteacher

@titus Use an old car raidiator instead safer and and a much larger metal mass for heat absorption.

Just Thinking
Guest
Just Thinking

My thoughts are: 1. Who wants to bathe in water ran through and heated in a car radiator or an old freon tube off of a refrigerator. Think of the contaminates that will be absorbed into the water. These contaminates will then be absorbed into the skin. 2. If the fridge isn’t working chances are there is no freon in it anyway to be released into the atmosphere. (I’m not sold on man being able to change the temperature of the world anyway.) 3. Not sure where the door mat listed in the parts list is at. If it’s black… Read more »

The Wizard of Cake
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The Wizard of Cake

But what you forget is your letting free cfc’s as soon as you undo the freezer radiator.

david henry
Guest
david henry

The foil reduces the efficiency of the heater. You want ABSORBTION, not reflection, of the solar energy.

solar water heaters
Guest

Is it really working?

Radiators
Guest

Just love this! I wish I had the ingenuity and ability to transform an outmoded product to a useful pieced of equipment. I often have flashes of ideas, but then lose sight of when it gets down to the physical completion and execution.

cory
Guest
cory

the sun causes global warming………not freon…..

titus
Guest

please do not use refrigerator parts: when you cut the tubing the refrigerant (freon) will be released into our atmosphere causing global warming…

Amy
Guest
Amy

Right so send it to a scrap yard where it will be smashed into a billion Pieces still released to the air .

kompo
Guest

I believe, that a big barrel with a water on the sun (on the roof) – after the hot day – can make more hot water then this 🙂