# Room Heater, Vented: Building Code Definition > How the IRC 2009 define room heater, vented, where the wording differs, and which chapters depend on the term. - Canonical: https://harth.build/resources/glossary/room-heater-vented/ - Last updated: 2026-09-07 - Data source: 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. ## Key facts | Fact | Value | | --- | --- | | Defined in | IRC 2009 (2009 editions transcribed in this corpus) | | Primary source | IRC 2009 Fuel Gas (model text, not a jurisdiction's adopted text) | | Chapters using the term | 5 (counted across the codes hosted here) | | Wording identical across codes | Single code (compare before citing one code's wording under another) | ## Direct answer Room heater, vented is a defined term in the International Residential Code (IRC) 2009, in Fuel Gas. The code's own words are: “A free-standing gas-fired heating unit used for direct heating ofthe space in and adjacent to that in which the unit is located. (See also “Vented room heater.')” 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 5 chapters of this corpus, most often in Fuel Gas (IRC 2009), Residential Energy Efficiency (IECC 2009), Energy Efficiency (IRC 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](https://nz.linkedin.com/in/barrington), Harth founder and architectural technology specialist · Published 2026-09-07 · Updated 2026-09-07.* ## What does this term mean? **Room Heater, Vented** — IRC 2009, Fuel Gas: > A free-standing gas-fired heating unit used for direct heating ofthe space in and adjacent to that in which the unit is located. (See also “Vented room heater.') ![Labeled code-term definition diagram: Room Heater, Vented: Building Code Definition](https://efwwel0vyt9vy5so.public.blob.vercel-storage.com/images/glossary/room-heater-vented/diagram-1344.webp) *How the IRC 2009 define room heater, vented, where the wording differs, and which chapters depend on the term.* ## What must be verified before using this guidance? **Room Heater, Vented** is defined once in this corpus, in the [Fuel Gas](https://harth.build/resources/building-codes/us-states/maryland/irc-2009/fuel-gas.md) chapter of the International Residential Code (IRC) 2009: > A free-standing gas-fired heating unit used for direct heating ofthe space in and adjacent to that in which the unit is located. (See also “Vented room heater.') ## Where room heater, vented is used in the code The term appears in 5 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](https://harth.build/resources/building-codes/us-states/maryland/irc-2009/fuel-gas.md) | IRC 2009 | 15 | | [Residential Energy Efficiency](https://harth.build/resources/building-codes/us-states/maryland/iecc-2009/residential-energy-efficiency.md) | IECC 2009 | 3 | | [Energy Efficiency](https://harth.build/resources/building-codes/us-states/maryland/irc-2009/energy-efficiency.md) | IRC 2009 | 3 | | [Specific Appliances, Fireplaces and Solid Fuel-burning Equipment](https://harth.build/resources/building-codes/us-states/new-hampshire/imc-2009/specific-appliances-fireplaces-and-solid-fuel-burning-equipment.md) | IMC 2009 | 2 | | [Heating and Cooling Equipment](https://harth.build/resources/building-codes/us-states/maryland/irc-2009/heating-and-cooling-equipment.md) | IRC 2009 | 2 | ## The terms room heater, vented 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 room heater, vented covers: - **[Vented Room Heater](https://harth.build/resources/glossary/vented-room-heater.md)** — IRC 2009: A vented self-contained, free-standing, nonrecessed appliance for furnishing warm air to the space in which it is installed, directly from the heater without duct connections. - **[Room Heater](https://harth.build/resources/glossary/room-heater.md)** — IRC 2009: A freestanding heating appliance installed in the space being heated and not connected to ducts. ## Room Heater, Vented: what to open, and in what order Every row is a document this term depends on. The [ICC code library](https://codes.iccsafe.org/codes) and the [ICC adoption maps](https://www.iccsafe.org/advocacy/code-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 | Residential Energy Efficiency (IECC 2009) | | | Re-check the requirement that uses it | Energy Efficiency (IRC 2009) | | | Re-check the requirement that uses it | Specific Appliances, Fireplaces and Solid Fuel-burning Equipment (IMC 2009) | | | Confirm the dependent definition | Vented Room Heater | | | Confirm the dependent definition | Room Heater | | | 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](https://harth.build/resources/glossary.md) - [Vented Room Heater: Building Code Definition](https://harth.build/resources/glossary/vented-room-heater.md) - [Room Heater: Building Code Definition](https://harth.build/resources/glossary/room-heater.md) ## 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](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. ### Source links - [codes.iccsafe.org](https://codes.iccsafe.org/codes) - [iccsafe.org](https://www.iccsafe.org/advocacy/code-adoption-maps/) ## Frequently asked questions ### What is the code definition of room heater, vented? The International Residential Code (IRC) 2009 defines it in Fuel Gas as: “A free-standing gas-fired heating unit used for direct heating ofthe space in and adjacent to that in which the unit is located. (See also “Vented room heater.')” 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 room heater, vented? In this corpus the term is used across 5 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 is an OFR room heater and how does it work? In the 2009 I-Codes hosted here it is a defined term rather than a description. The IRC 2009 states, in Fuel Gas: “A free-standing gas-fired heating unit used for direct heating ofthe space in and adjacent to that in which the unit is located. (See also “Vented room heater.')” 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. --- - Continue in Harth (open this topic in the Harth agent): https://app.harth.build/agent?context=%2Fresources%2Fglossary%2Froom-heater-vented%2F - View this page in a browser: https://harth.build/resources/glossary/room-heater-vented/ - All resources for agents: https://harth.build/llms.txt