Solar Water Heater with Plastic Bottles

How to make a water heater with big plastic (PET) bottles. Inside each bottle there is a 3.5 meteres piece of 4 mm drip watering tubing.

This heater takes advantage of the greenhouse effect inside the bottles. It is like the heat inside a car in the sun in summer.

Since when the circuit is stopped the water heats more inside the tubing it woul be a good idea to use a timer with i. e. 1 minute ON and 1 minute OFF. This also would protect the pump motor from excessive heating.

With a small water pump the water is cycled and the temperature rises.

It would be better to use a 12 volt DC motor water pump connected to several solar cells.

You can also try to paste a sheet of aluminum foil in order to concentrate more heat inside the bottles.

The solar water heater is scalable, so you can connect more bottles and groups of bottles in order to heat a swimming pool.
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20 thoughts on “Solar Water Heater with Plastic Bottles”

  1. I wonder how many idiots thing they are going to be able to take a nice hot shower with this crap. It's barely enough volume to make a cup of tea

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  2. interesting concept but why not fill the plastic bottles with a water with black dye? Put the water supply on gravity. and you might be able to snake enough water through more bottles with no connections.. But the concept is genius. In fact you can telescope one bottle into another. .. and only have two caps per long tube of bottles.

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  3. Thank you for sharing your project.
    As commented here previously; the volume of water is extremely low and the friction all the curves and too small a diametre of hose being used — the electricity consumption is pretty high for the gain in heat by the sun.

    You can use 3/4 of an inch preferably cupper tube (as for the toxins released by the plastic hose), solder it as a radiator and you can either cover them with the plastic bottles (make sure to make a tight fitting hole at the other end, or place the system in a box and cover the whole with a templated pane of glass (to resist the heat and heat changes)

    This way the volume of water increases a lot and the temperature of the water can reach about 80 degrees Celsius.

    Regards from Mexico

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