- The 66EH is most popular in feedlots and larger livestock producers, with a animal capacity of up to 300 you can understand why this is out most popular waterer for larger operations. This bowl is also large enough to split between 2, 3 or 4 pens. - 35 Gallons water capacity - 1000W 110V or 220V - 1" Full Flow water valve - Up to 300 Head