What’s the function of the baking soda? Disinfectant?

You can always dump the hot water in an outside radiator if you HAVE to cool the server room to keep the temps down. A simple fan duckt would probably doo fine too. However with the heat pump you can also heat a little hot tub to use outside in summer

You can even dump the cold air from the heat pumps into the server room and pull the hot air back into the heat pump again to gain even better efficiency