DIY Solar Water Heater From BIG (PET) Plastic Bottles

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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.

image/text credit: mopatin

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.

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The solar water heater is scalable, so you can connect more bottles and groups of bottles in order to heat a swimming pool.Solar water heaters are probably the most widely used solar product worldwide, especially in Asia and other parts of the developing world it is a constant with any new construction.

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