Ring burners are specially designed for heating of kettles, rinse tanks, vertical boilers, cauldrons, ovens, stereotype pots, and similar applications. These can be supplied with a pilot, so the main burners can be automatically turned on and off. These are made in a number of sizes and capacities to fit various types of applications. The bottom entrance burners are commonly used to convert various types of kettles and pots or ovens to gas firing where rather large combustion chambers exist.