At the Worlds Fair in London, in 1851, was when the first gas stove was actually shown. However, these gas stoves were rather ungainly and unattractive, and due to the slow growth of the gas pipe line they did not become commercially successful until the 1880s. The original size of these stoves was definitely unwieldy, yet eventually the oven was integrated into the base and the size was reduced to better fit in a kitchen.
Before the development of pilot lights, the stoves had to be manually lit using a match. If the gas was accidentally left on with the door closed, then gas would fill the oven and possibly the entire room, and if there was a spark of any kind it often led to an explosion.
Eventually, manufacturers developed a safety valve that used a pilot flame to ignite the main burner on the gas stoves when turned on it would heat a thermocoupler that would send a signal to the valve so that it would stay open. If the pilot light went out for any reason, then the thermocoupler would cool off and signal the valve that it needed to close, thus shutting off the gas.
Using zoned heating, where you use the stove to heat a particular area of your home, is useful in saving money on your heating bills. Also, some of the newer gas stoves can be used by venting out through an existing chimney or even with a direct vent used in the wall behind the stove.
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