Adds the heat pump, a heat pipe worker's swiss army knife! It can function as a valve, pump, or relay for heat! Part 3 of the my bigger GasHeatStuff collection.
Mods introducing new content into the game.
When inspected in the Factoriopedia, it's listed as having the ability to craft various recipes (shown above is Space Age only, with additional mods the list grows).
Also, the various internal heatpump output entities are displayed in the Factoriopedia, when I assume they're meant to be hidden.