Pilot Light
A pilot light is a small, continuously burning flame in some gas-fired HVAC systems and water heaters. It ignites the main burner when heat is needed, allowing quick ignition without electronic systems. Because it burns continuously, it uses a small amount of energy even when the appliance is idle.
💡 Key Takeaways
- ✓A pilot light is a small, continuously burning flame in some gas-fired HVAC systems and water heaters. It ignites the main burner when heat is needed, allowing quick ignition without electronic systems. Because it burns continuously, it uses a small amount of energy even when the appliance is idle.
- ✓Pilot lights should burn blue; yellow flames can indicate carbon monoxide risk.
- ✓Thermocouples shut off gas if the pilot goes out.
- ✓Many modern appliances use electronic ignition for higher efficiency.
Pilot Light
/ˈpaɪlət laɪt/
Definition
A pilot light is a small, continuously burning flame in some gas-fired HVAC systems and water heaters. It ignites the main burner when heat is needed, allowing quick ignition without electronic systems. Because it burns continuously, it uses a small amount of energy even when the appliance is idle.
What does a pilot light do?
It provides a constant flame that ignites the main burner when heat is needed.
Source: The Cooling Company
Quick Facts
How Pilot Light Works
Pilot flame ignites the burner and works with safety sensors.
Real-World Application
A homeowner relights a water heater pilot after a draft extinguishes it, restoring hot water safely by following the manual.
Pro Tip
A steady blue flame is normal. Yellow or orange flames signal a problem that needs professional attention.
“A steady blue flame is normal. Yellow or orange flames signal a problem that needs professional attention.”
Important Things to Keep in Mind
- Pilot lights should burn blue; yellow flames can indicate carbon monoxide risk.
- Thermocouples shut off gas if the pilot goes out.
- Many modern appliances use electronic ignition for higher efficiency.
Did You Know?
Pilot lights have been used in gas appliances for over a century as a reliable ignition method.
FAQ
Why does my pilot light keep going out?
Common causes include drafts, a dirty pilot, or a failing thermocouple.
Can I relight a pilot light myself?
Often yes, but follow the manufacturer instructions carefully and shut off gas if you smell fuel.
Is a pilot light safe?
Yes when maintained properly, but issues like yellow flames or frequent outages require service.
Related Services
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