This guide explains how to repurpose an old refrigerator into a solar water heater using recycled materials and basic tools. The process involves creating a solar collector, modifying a storage tank, and integrating both into a disassembled fridge.

Solar Collector Construction

  1. Build a wooden box (2′ x 4′ x 5″) as the collector frame.
  2. Create an absorber plate by soldering copper tubing into a zigzag pattern on a black-painted metal sheet.
  3. Insulate the collector with foam, cardboard, and plastic glazing to maximize heat retention.

Storage Tank Preparation

  1. Use a 5-gallon gasoline can as the water storage vessel.
  2. Modify the can with copper pipe fittings for water inflow/outflow.
  3. Insulate the tank with aluminum foil, plastic, and newspaper wrapped in steel wire.

Fridge Modification

  1. Remove all internal components (motor, coils, shelves) from the refrigerator.
  2. Create an opening in the back panel to insert the storage tank.
  3. Insulate the fridge interior with newspapers and secure the tank on shelves.

System Assembly

  1. Connect the storage tank to the solar collector using polyethylene tubing and cinch pipe fittings.
  2. Install a gate valve on the hot water outlet for temperature control.
  3. Ensure proper venting and add antifreeze (non-salt-based) for winter use.

Installation Tips

  • Position the collector facing south at an angle equal to your latitude +15°.
  • Use a garden hose for automatic refilling if needed (remove vent hole in this case).
  • Regularly inspect connections and replace antifreeze after winter.

The system can produce 140-160°F water in summer and 70-90°F in winter, depending on collector size and sunlight exposure.

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