So, this is my brother-in-law's microbrewery he built in his garage. The left keg/kettle is for boiling water. Inside the kettle is an electric heating element that can heat the water to over 220 F. Also in the kettle is copper tubing that runs the wort (what will become beer after fermenting) from the second through the hot water with out directly coming in contact with the heating source. This prevents burning of the vegetable matter in the liquid. In the upper left of the image ins the control panel that automates the entire process of the recipe (which can be altered). Anyway it's really complicated to explain and it takes about 3 hours to make the beer and 8 weeks to ferment / age the beer. But the end result has been most tasty!
