This heater takes advantage of the greenhouse effect inside the bottles. It is like the heat inside a car in the sun in summer. 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.
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Recycled plastic bottle solar water heater is an effective and zero fuel consumption way to heat the water for domestic purposes. It can be made by following easy steps and using simple recycle material and can fulfill the need of an average house.
source-image: 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.
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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.
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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.
The alternative water heater can provide power savings of up to 30 per cent, but apart from that, Alano notes that every recycled solar water heater built also means less plastic bottles and cartons finding their way to landfill.
