Allows you to preheat the Water with an Efficiency greater than 100% using the free Energy of the Atmosphere.
Reduces the Coal input per PowerOutput and Increases Nuclear Reactor Output.
Every Heatpump has a Speed of 300Water/s.
MK1 has an Efficiency of 600%,preheat the Water from 15°C to 40°C,Reduces Coal input per PowerOutput by 14%, can increas Nuclear Reactor Output by 4,5%.
MK2 has an Efficiency of 300%,preheat the Water from 40°C to 65°C,Reduces Coal input per PowerOutput by 27%, can increas Nuclear Reactor Output by 8,6%.
MK3 has an Efficiency of 200%,preheat the Water from 65°C to 90°C,Reduces Coal input per PowerOutput by 40%, can increas Nuclear Reactor Output by 12,2%.

Sprites are from Krastorio2.