Updated 2026-09-07

Building Code Glossary

Boiler Room: Building Code Definition

How the IMC 2009 define boiler room, where the wording differs, and which chapters depend on the term.

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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.

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Direct answer

Boiler room is a defined term in the International Mechanical Code (IMC) 2009, in Definitions. The code's own words are: “A room primarily utilized for the installation of a boiler.” No other I-Code in this corpus defines it, so the IMC 2009 definition is the one to work from. The term is used in 8 chapters of this corpus, most often in Boilers, Water Heaters and Pressure Vessels (IMC 2009), General Requirements (IFC 2009), Definitions (IMC 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?

Boiler Room — IMC 2009, Definitions:

A room primarily utilized for the installation of a boiler.

Labeled code-term definition diagram: Boiler Room: Building Code Definition — How the IMC 2009 define boiler room, where the wording differs, and which chapters depend on the term.

What must be verified before using this guidance?

Boiler Room is defined once in this corpus, in the Definitions chapter of the International Mechanical Code (IMC) 2009:

A room primarily utilized for the installation of a boiler.

Where boiler room is used in the code

The term appears in 8 chapters of the 2009 I-Codes hosted here. The chapters that lean on it hardest are the ones to read next.

Chapter	Code	Mentions
Boilers, Water Heaters and Pressure Vessels	IMC 2009	3
General Requirements	IFC 2009	2
Definitions	IMC 2009	2
Existing Structures	IBC 2009	1
General Regulations	IMC 2009	1
Specific Appliances, Fireplaces and Solid Fuel-burning Equipment	IMC 2009	1
Duct Systems	IRC 2009	1
Fuel Gas	IRC 2009	1

The terms boiler room is built out of

The definition above leans on 1 other defined term. Each carries its own code definition, and a local amendment to any of them changes what boiler room covers:

Boiler — IRC 2009: A self-contained appliance from which hot water is circulated for heating purposes and then returned to the boiler, and which operates at water pressures not exceeding 160 pounds per square inch gage (psig) (1102 kPa gauge) and at water temperatures …

Boiler Room: 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 IMC	Definitions
Re-check the requirement that uses it	Boilers, Water Heaters and Pressure Vessels (IMC 2009)
Re-check the requirement that uses it	General Requirements (IFC 2009)
Re-check the requirement that uses it	Definitions (IMC 2009)
Re-check the requirement that uses it	Existing Structures (IBC 2009)
Confirm the dependent definition	Boiler
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.

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 boiler room?

The International Mechanical Code (IMC) 2009 defines it in Definitions as: “A room primarily utilized for the installation of a boiler.” 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 boiler room?

In this corpus the term is used across 8 chapters, led by Boilers, Water Heaters and Pressure Vessels in the IMC 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 is a boiler room in a building?

In the 2009 I-Codes hosted here it is a defined term rather than a description. The IMC 2009 states, in Definitions: “A room primarily utilized for the installation of a boiler.” It is defined in IMC 2009. It is not the same as Building, which the IBC 2009 defines separately as “Any structure used or intended for supporting or sheltering any use or occupancy.” 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.

What is the code for the boiler room?

In the 2009 I-Codes hosted here it is a defined term rather than a description. The IMC 2009 states, in Definitions: “A room primarily utilized for the installation of a boiler.” It is defined in IMC 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.

What are the venting requirements for a boiler room?

In the 2009 I-Codes hosted here it is a defined term rather than a description. The IMC 2009 states, in Definitions: “A room primarily utilized for the installation of a boiler.” It is defined in IMC 2009. It is not the same as Venting, which the IRC 2009 defines separately as “Removal of combustion products to the outdoors.” 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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