Product Details. BWT bestmax is the simple and practical all-​round filtration solution developed for the numerous requirements in gastronomy. For unique coffee water, ideal water for vending machines and optimal pure steam for ovens and combination steamers. Thanks the new High-​Efficiency-​Technology (HET), water optimisation is even more efficient. The result: consistently high quality of all hot and cold beverages in cups and mugs, in the kitchen and in the bakery, for all foods and baked goods.