It does not. A regular percolator does, as it circulates the coffee back into the boiling water, unlike a moka pot, where the finished coffee does not sit at the bottom close to the heat, but in the top compartment. You should take it off the stove as soon as it’s done to avoid getting the finished coffee back to a boil or overextracting the coffee but if you do it right, they make really good coffee. There are even some versions that feature a valve, so the coffee is cooked at a higher pressure, getting it a little closer to espresso and producing a nice –albeit short lived – crema.