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Server as heating device - how do I do this?
(slrpnk.net)
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You could probably mod a water cooler system to connect to a water to water heat exchanger like this: https://www.heata.co/
In general, like others have said, lots of humidity is bad for the hardware, you will need to separate this somehow. But heating a small grow-room with an extension of a CPU water cooler might be possible.