Apparently it consumes about 1KW electric power to produce 1000 litres in 24 hours. I suspect that is optomistic. The same "inventor" also recently invented the Stirling steam engine to drive a generator for this. The stirling engine would be about 15% or 20% efficient, possibly less in a hot country, and was originally made in Cornwall about 1760 for powering lifts in Cornish mines.
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