Dual Fractionator, with Pile Sorters - the deuterium output is also piled at each stage to allow maximum throughput. Production for each (with maxxed Pile Sorter upgrade):
140+ per minute (no proliferation) 180+ per minute (Mk I proliferation) 200+ per minute (Mk II proliferation) 280+ per minute (Mk III proliferation)
Stamp down as many as you want for a build. Three rows/bands of these can be placed in the sub-tropical zone.