How to Build a Portable Instant Hot Water Heater


You can build an instant hot water heater that can travel with you anywhere. All you need is a few simple household materials and some items purchased from your local hardware store. The portable hot water heater is used mainly for taking a shower when camping. The power source for the instant hot water heater comes from the sun.

Things You'll Need

  • 1 large 5 gallon plastic bottle of water
  • 20 gallon black plastic trash bag with ties
  • 12 feet of rubber medical tubing about 1 inch in diameter
  • 2 thick rubber bands
  • Clamp
  • 2 yards of twine
  • Cup
  • Spoon
  • Place a water-filled, plastic five-gallon bottle with the cap on inside a small, black 20 gallon plastic trash bag. Tie off the top of the trash bag using the attached bag ties.

  • Place the bag outside on a sunny day for at least two hours.

  • After two hours, remove the bottle from the plastic bag and remove the cap from the bottle.

  • Stretch the rubber hose over the bottle's opening and secure the hose around the opening by wrapping a couple of rubber bands around it.

  • Fold over the end of the hose to stop the water from flowing out and turn the bottle upside down. Alternatively, you can put a clamp anywhere on the hose to cut off the flow of water from the hose. Tie the bottle upside down to a tree above your head height, and secure the bottle by wrapping twine around the bottle and tree together.

  • Unfold or unclamp the hose and allow the hot water to flow out.

Tips & Warnings

  • Before you pour the hot water on your body, let a little of it run into a cup. Take a spoon and dribble a few drops of the water onto the back of your hand to make sure it's not too hot.

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