Pilot Light
Definition and meaning of Pilot Light in real estate.
A pilot light is a small, continuously burning gas flame that ignites the main burner in gas-fired appliances such as furnaces, water heaters, and ovens. It serves as a constant source of ignition, eliminating the need to manually light the burner each time the appliance turns on.
In more detail
Pilot lights are standard components in older gas appliances, operating on a continuous flow of a small amount of natural gas or propane. To ensure safety, appliances with pilot lights are equipped with a thermocouple, which is a sensor that shuts off the gas supply if the flame is extinguished.
Modern energy codes have largely phased out standing pilot lights in new construction, replacing them with electronic ignitions that only light when the appliance is in use. Home buyers should check the type of ignition systems in a property, as older pilot lights can raise energy costs. Home inspectors will test these devices to ensure they are clean, properly adjusted, and functioning safely.
Key facts
| Category | Property Types & Construction |
|---|---|
| Energy source | Natural gas or propane |
| Key safety component | Thermocouple (flame sensor) |
| Watch out for | Yellow flames, which indicate incomplete combustion or a dirty burner |
A buyer moving into an older home realizes the gas water heater has a standing pilot light that needs to be manually relit after a gas utility service interruption.
Frequently asked questions
Why does my pilot light keep going out?
Common causes include a drafty location, a dirty or clogged gas orifice, or a failing thermocouple sensor that needs to be replaced.
Is a constantly burning pilot light safe?
Yes, provided the thermocouple safety valve is functioning correctly to stop the gas flow if the flame goes out, though they do slowly consume fuel.