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https://oxygennotincluded.gamepedia.com/Metal_Refinery
In general though, it won't heat your water up more than 56 K, so if you ensure that your water starts below 40 C, it won't break your pipes.
In the early game (i.e. before you have steam turbines), you can just use open-loop cooling, i.e. feed it reasonably cool water or polluted water and dump the resulting hot water into a cistern. You can cool it down once you have the relevant technologies, or you can use it for something where temperature doesn't matter, e.g. running the super computer or turning it into steam.
Even the room the metal refinery is in was at ~10. :p
Wish I had the save still but, of course I have since started using another liquid.
Germy water works, but it does need to be cold enough to avoid breaking the pipes and refinery. Also, it comes out hot from the refinery, and that can be a quick death if you send that hot water back into the base.
Radiant pipes with a liquid above 125C will instead produce steam with no power cost, so that's where it becomes power positive.