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Archae have to be keept at the right temperature, at about 37°C. In temper and cold climate this gets difficult especially with small scale digesters. There are two options available: heating and / or insulation.
Placing the digester inside a compost keeps the digester warm. This method is also called the Jean Pain method.
The digester needs its food in a mixture with water in a ratio 1:1. The water could or even should be hot water in order to keep the digester on temperature