It's also possible to use copper tubing in PEX tubing or coils of copper tubing in a piece of PVC pipe. In the case of the PVC pipe, design it to swirl the water for better heat transfer and make at least one end screw on so it can be opened for cleaning.
To coil tubing, simply wrap it around a rigid cylindrical object such as a piece of pipe. There are also tools designed just for bending tubing.
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To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
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