I think five gallons is a
good start for our first do it yourself solar shower.
For the longest time I had a
50 gallon solar barrel image in my mind, but finally realized we didn't
need nearly that much volume, and 5 gallons might warm up faster.
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You'd get much more heating by making a proper solar collector. Simple collectors (designed for swimming pools) are available ar rubber mats with water channels (e.g. in kit form, or you could DIY them, or buy pre-pressed absorbers.
A lot of these swimming-pool systems use an electric pump, but a thermosiphon (without a pump) is also possible.
I pondered the more complicated method, but Mark's curious to see whether something really simple would work. I've noticed that a hose in direct sunlight here gets too hot to shower with even in April sometimes, so we're hoping that a simpler method will be all we need for warm, but not boiling, water.
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You'd get much more heating by making a proper solar collector. Simple collectors (designed for swimming pools) are available ar rubber mats with water channels (e.g. in kit form, or you could DIY them, or buy pre-pressed absorbers.
A lot of these swimming-pool systems use an electric pump, but a thermosiphon (without a pump) is also possible.