The Weber Genesis E-320 is one of the two Genesis E models within the color Genesis series. It is basically the same as the E-310, but has a 12,000 BTU-per-hour input flush-mounted side burner, whereas the E-310 does not. It also has 42,000 BTU per-hour input, an Electronic Crossover® ignition system, porcelain-enameled cast-iron cooking grates, porcelain-enameled Flavorizer® bars, and other terrific features. Both E models are slightly simpler than the other color Genesis model, the Genesis EP. The E-320 comes in black, copper, and green. The NP grills only come in black.