This is a 12 boiler tile-able setup that you can use before you even do any research, ie., it doesn't use any underground belts. Just attach 2 pumps. Tile it 4 times to reach the max capacity for the water input.

Originally shared on the public FactorioPrints / Factorio School archive (factorioprints.com · factorio.school). Authorship preserved from the public catalog.
This is a 12 boiler tile-able setup that you can use before you even do any research, ie., it doesn't use any underground belts. Just attach 2 pumps. Tile it 4 times to reach the max capacity for the water input.