Modern gas furnaces (from around 2010) do not have a typical pilot light that runs continuously. Instead, they employ electrical ignition systems that only ignite when necessary. This saves energy and reduces wear and tear on the system.
Furnace pilots were originally developed to make sure that a small amount of oil or natural gas would always be burning in the furnace to prevent major explosions. Since then, some furnace manufacturers have added fuel lines leading up to the top of the furnace that release more gas if the temperature gets too low. This helps to keep your home warm even if one or two of the burners is shut off by a thermostat. But these features are used only as an extra precaution; modern furnace designs don't need pilots to work.
Pilot lights have been replaced by electronic sensors that detect heat coming out of certain parts of the house. If something blocks all the hot air from leaving the room, for example, the sensor will activate the gas valve so you won't be left in the cold. These sensors can also be set to turn on other appliances in the house, like the water heater or dryer.
A pilot light is no longer used in most modern mid-to-high-efficiency gas furnaces. An electric ignition has taken its place. As a consequence, the furnace will no longer need to continually consume gas in order to keep a pilot light lit, eliminating the need to switch off your furnace for the summer. However, some older furnaces still have pilot lights and so they should be turned off during the winter months to prevent the possibility of a fire starting.
The main reason why you would want to turn off the pilot light is if you are going to be away from home for an extended period of time. If you leave your furnace running when you go out of town, it may not be shut off when you return, which could lead to unnecessary damage or even destruction of your home. You should also turn off the pilot light if you plan to have someone else care for your furnace while you are gone. They can use the stovepipe method to stop the flow of gas if necessary.
If you have a single-stage thermostat, then you will want to set the temperature as high as it will go during the day and then back down at night. This will ensure that you are not wasting energy by having it constantly on while you are not at home.
The best way to conserve energy is to simply use less. If you leave your furnace running all the time when you are not at home, then it is not going to help you save any energy.
The majority of contemporary gas ranges and ovens do not have pilot lights. Instead, an electric ignition device ignites the gas. When an electric current flows through an element in this sort of system, it becomes heated and glows like the filament in a lightbulb. This process is called "electric ignition." Some older models of range and oven were designed to work with natural gas instead of propane. They included a pilot light just like those used with oil or coal burners. These models still work fine with either type of fuel but they cannot be converted to use electricity as their ignition source.
Modern gas appliances function very differently than their old counterparts. They no longer require a flame to ignite the gas and they do not need a pilot light to operate. This type of appliance uses sensors instead of fire to start the cooking process. If there is a presence of food above the heating element, the sensor will activate the burner circuit to begin cooking. If there is no food present, the sensor will deactivate the burner circuit so that energy is not wasted heating up empty space.
Gas cooktops are the most common type of stove in the United States. They are available in two main styles: freestanding and built-in. On a freestanding model, the gas pipe for the burner unit is brought into the room separately from the water line for the sink or other fixture.