The company has a further option for another Hoegh ship at Hyundai Heavy Industries in Korea that is valid until December.
The units will be supplied with seawater filter and steam/seawater heating modules.
The system to be supplied for Gazprom will be "winterised" to operate in temperatures as low as minus 30°C.
"By utilising seawater for heating, CO2 emissions are far less than solutions using steam heating," Wartsila said.
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