Swedish utility company Vattenfall has unveiled a vast “thermos” that will store millions of gallons of hot water to help heat homes in Berlin this winter, even if Russian gas supplies dry up.
source https://www.seattletimes.com/business/berlin-prepares-huge-thermos-to-help-heat-homes-in-winter/?utm_source=RSS&utm_medium=Referral&utm_campaign=RSS_technology
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