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Prosthetic hearts are a heart replacement with 80% efficiency. They can be crafted on a Machining table.
Installing a prosthetic heart on a healthy patient will yield a normal Heart. Normal organ harvesting penalties apply when harvesting a heart in this way. However, it used to be possible to harvest better organs this way without killing them and without mood or reputation penalties.
On the plus side, prosthetic hearts provide a fairly cheap (25 steel, 4 components per heart) method of harvesting one of all harvestable body parts. Just remember to harvest the Liver last and that you cannot reclaim the heart from a lifeless corpse