What is Cold Brew Percolator? Cold Brew Percolator is a water-saving percolator designed to make cold brew coffee without the need for ice or external cooling elements. Cold brew coffee is a delicious treat, but chilling it in a refrigerator or using ice is inefficient and slow, wasting energy and time. Cold Brew Percolator is a self-cooling coffee machine that uses a series of spinning coils to circulate the liquid and speed up the dissipation of heat when brewing cold coffee. Cold Brew Percolator is easy to use, and features removable wooden filters, a continuous sprinkle head, and an external tap that makes serving the brewed coffee easy.