|This article is about the Engine Efficiency Module as it appears in Subnautica. To see this subject as it appears in Below Zero, click here.|
|This article is about Engine Efficiency Module. If this is not what you are looking for, see Upgrade Module (Disambiguation).|
The Engine Efficiency Module recycles heat by-product to minimize power inefficiencies. Each Module reduces power use by 15% (Can be stacked up to four modules resulting in a maximum power efficiency of 60%).