If using water as a condensing medium is an option for your application, you are looking in the right place. We currently offer eleven models in our WC line, from 10 horsepower to 40 horsepower. Like all Mueller units, R-507 is the operating refrigerant. Using water to cool your milk indirectly offers many benefits. With no outside remote condenser to pipe the compressor to, you save massive amounts on copper line sets. The water-cooled condenser is neatly mounted under the compressor package on the Mueller WC units, making the physical footprint very compact.