Category: Off Grid Projects

Need ideas for quickly generating warm shower water? Watch this amusing video showing a simple system using a water pump and heat exchanger coil.

While it could certainly be improved upon with some easy modifications that would help it both heat up faster and be much safer, it’s a great illustration of creative thinking, and a simple demonstration of exactly how an on-demand hot water system works. It would be interesting to see something like this installed more permanently… Perhaps even running off of a small wood-burning rocket stove?

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Do you need to disinfect a few batches of water to make them safe to drink? You can do this easily by setting a few bottles of clear water out in the sun for the duration of the day (or over two days if it’s 1/2 cloudy). This method, called SODIS (i.e. “SO-lar DIS-infection”), uses the sun’s UVA rays to effectively kill bacteria and viruses. One requirement is that the water in the bottle be clear enough to read through. If you’re starting with dirty water, you should strain it through a clean cloth and let it settle first.

(Note that this method won’t actually filter the water — it will simply kill pathogens. But there are easy ways to filter water, using a quick sand filter or, if you have a more permanent stationary installation, a biosand water filter.)

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