Build it solar

How to avoid tanks from freezing over in case they have to be left in the garden? The Build it Solar website lists many examples of solar heaters and other DIY projects. Particularly inspiring examples are the Solar Horse Tanks.
On the other hand, inside a wooden barn which is a bit better isolated than most greenhouses, it is maybe sufficient to have a large water mass for heat storage, for example by stacking a number of plastic tanks with water in a spot which receives much sunlight during the day, not too far from the tanks with fish.
Should be ready by next winter…

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