Building Code Glossary
Pilot: Building Code Definition
How the IRC 2009 define pilot, where the wording differs, and which chapters depend on the term.
On this page
Last updated September 7, 2026 · Definitions quoted from the 2009 International Codes as transcribed in this site's building-codes collection, with the source chapter linked for each quotation. Usage counts are computed over the chapters hosted here, one copy per code. The [ICC code library](https://codes.iccsafe.org/codes) publishes the current model text and the [ICC adoption maps](https://www.iccsafe.org/advocacy/code-adoption-maps/) show which edition a jurisdiction has adopted; those sources control.
Direct answer
Pilot is a defined term in the International Residential Code (IRC) 2009, in Fuel Gas. The code's own words are: “A small flame that is utilized to ignite the gas at the main burner or burners.” No other I-Code in this corpus defines it, so the IRC 2009 definition is the one to work from. The term is used in 6 chapters of this corpus, most often in Fuel Gas (IRC 2009), Fire Protection Systems (IBC 2009), Commercial Energy Efficiency (IECC 2009). These pages transcribe the 2009 model text; verify the definition against the edition and amendments your authority having jurisdiction has adopted. Record the jurisdiction, the adopted edition, the application date and any local amendment that rewrites the definition before you use it on a live project, because a term redefined by amendment changes every requirement that depends on it.
Content and cited inputs reviewed by Scott Barrington, Harth founder and architectural technology specialist · Published 2026-09-07 · Updated 2026-09-07.
What does this term mean?
Pilot — IRC 2009, Fuel Gas:
A small flame that is utilized to ignite the gas at the main burner or burners.
What must be verified before using this guidance?
Pilot is defined once in this corpus, in the Fuel Gas chapter of the International Residential Code (IRC) 2009:
A small flame that is utilized to ignite the gas at the main burner or burners.
Where pilot is used in the code
The term appears in 6 chapters of the 2009 I-Codes hosted here. The chapters that lean on it hardest are the ones to read next.
| Chapter | Code | Mentions |
|---|---|---|
| Fuel Gas | IRC 2009 | 10 |
| Fire Protection Systems | IBC 2009 | 2 |
| Commercial Energy Efficiency | IECC 2009 | 2 |
| Residential Energy Efficiency | IECC 2009 | 2 |
| Fire Protection Systems | IFC 2009 | 2 |
| Energy Efficiency | IRC 2009 | 2 |
The term in use
How the code actually writes about pilot, quoted from the 2009 text hosted here:
Decorative appliances for installation in approvedsolid fuel-burning fireplaces, with the exception of those tested in accordance with ANSI Z21.84, shall utilize a direct ignition device, an ignitor or a pilot flame to ignite the fuel at the main burner, and shall be equipped with a flame safeguard device.
Pool heaters fired by natural gas or LPG shall not have continu-0usly burning pilot lights.
Pool heaters fired by natural gas shall not have continuously burning pilot lights.
The terms pilot is built out of
The definition above leans on 2 other defined terms. Each carries its own code definition, and a local amendment to any of them changes what pilot covers:
- Main Burner — IRC 2009: A device or group of devices essentially forming an integral unit for the final conveyance of gas or a mixture of gas and air to the combustion zone, and on which combustion takes place to accomplish the function for which …
- Burner — IRC 2009: A device for the final conveyance of the gas, or a mixture of gas and air, to the combustion zone.
Pilot: what to open, and in what order
Every row is a document this term depends on. The ICC code library and the ICC adoption maps cover the middle rows.
| Check | Where | Confirmed |
|---|---|---|
| Read the definition in the adopted IRC | Fuel Gas | |
| Re-check the requirement that uses it | Fuel Gas (IRC 2009) | |
| Re-check the requirement that uses it | Fire Protection Systems (IBC 2009) | |
| Re-check the requirement that uses it | Commercial Energy Efficiency (IECC 2009) | |
| Re-check the requirement that uses it | Residential Energy Efficiency (IECC 2009) | |
| Confirm the dependent definition | Main Burner | |
| Confirm the dependent definition | Burner | |
| Local amendment to any of the above | Jurisdiction's amendment list |
A research aid, not a code determination. The authority having jurisdiction decides which edition and which amendments apply.
Where can you explore related guidance?
- Explore all glossary guidance
- Main Burner: Building Code Definition
- Burner: Building Code Definition
Sources and method
Definitions quoted from the 2009 International Codes as transcribed in this site's building-codes collection, with the source chapter linked for each quotation. Usage counts are computed over the chapters hosted here, one copy per code. The ICC code library publishes the current model text and the ICC adoption maps show which edition a jurisdiction has adopted; those sources control.
Source links
Frequently asked questions
What is the code definition of pilot?
The International Residential Code (IRC) 2009 defines it in Fuel Gas as: “A small flame that is utilized to ignite the gas at the main burner or burners.” The 2009 model text is reproduced here; the definition that binds your project is the one in the edition your jurisdiction has adopted, as amended locally.
Which parts of the code depend on pilot?
In this corpus the term is used across 6 chapters, led by Fuel Gas in the IRC 2009. Those are the sections whose scope moves if the definition is amended locally, so read them together with Chapter 2 rather than on their own.
What are the different types of building codes?
Building is a separate defined term. The IBC 2009 defines it as: “Any structure used or intended for supporting or sheltering any use or occupancy.” That is not the same as pilot, which the IRC 2009 defines as “A small flame that is utilized to ignite the gas at the main burner or burners.” — read both before applying either, and confirm the wording in the edition your jurisdiction has adopted.
What does "pilot" mean in slang?
In the 2009 I-Codes hosted here it is a defined term rather than a description. The IRC 2009 states, in Fuel Gas: “A small flame that is utilized to ignite the gas at the main burner or burners.” It is defined in IRC 2009. Because it is a defined term, whatever the adopted edition says it means is what every section using it means — so check Chapter 2 of that edition and any local amendment before relying on this wording.
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