Shown here is the pre-start up configuration, so it's before the water has evaporated or dupe access has been shut down. You need to have the water/tile of the room be less than 150 * the height of the room. In this case with a height of 4 the upper limit is 600kg/tile, so I am very very close to that at about 593 kg/tile.
I stack liquids in the turbine area (brine, salt water, polluted water, water, and ethanol: pick 3 you have available and use in that order from bottom to top) and use that as double-duty for the metal cooling area. Set the liquid pipe thermo sensor to "green above 25" and the rail thermo sensor to "green above 130." The machinery in the steam room needs to be steel.
The manual generator can be removed after the room has been vacuumed.