UL 1482
UL 1482 is the safety standard for solid-fuel room heaters — the listing that establishes a wood stove’s tested clearances, floor protection, and construction. It is entirely separate from EPA certification: UL 1482 covers fire safety, the EPA covers particulate emissions, and a stove needs both.
A stove is tested in a mock-up room with combustible walls, ceiling, and floor while it is run hard. The standard limits how far those surfaces may rise above room temperature, and the distances at which the appliance stayed inside that limit become the clearances printed in its manual. Change the configuration — remove the rear shield, switch from a top vent to a rear vent — and a different tested row applies.
Because the listing is what an inspector and an insurer rely on, an unlisted or unidentifiable stove falls back to NFPA 211’s generic defaults: 36 inches to combustible walls for a radiant stove, and 18 inches for single-wall connector pipe.
| Full title | UL 1482, Standard for Solid-Fuel Type Room Heaters |
|---|---|
| What it covers | Freestanding radiant and circulating stoves for residential low-heat chimney |
| What it does not cover | Emissions — that is EPA 40 CFR 60 Subpart AAA |
| Installation reference | NFPA 211, plus the model’s own manual |
| Related listings | UL 127 (factory-built fireplaces), UL 103 HT (chimney), UL 1618 (wall and floor protectors) |
| Mobile home baseline | HUD Manufactured Home Construction and Safety Standards, 24 CFR Part 3280 |
UL 1482 and EPA certification answer different questions
These two get conflated constantly, and the confusion has real consequences. EPA certification is an emissions certification issued under the New Source Performance Standards: it says the model met a particulate limit — 2.0 g/hr on crib wood or 2.5 g/hr on cord wood under the 2020 Step 2 rule — on a specific test. It says nothing whatsoever about whether the appliance is safe to put near a wall.
UL 1482 answers the safety question. It is a construction and fire-safety listing covering surface temperatures, clearances, floor protection, door and latch integrity, ash handling, and the materials the stove is built from. The clearance table in the manual, the required hearth pad R-value, the permitted vent configurations — all of that comes from this listing, not from the EPA certificate.
The practical upshot: a permit will normally require both, and a stove carrying one but not the other is a problem. This site’s data comes from the EPA’s certified wood heater database, which records emissions and efficiency but does not record safety listings — so the fact that a model appears here tells you it is EPA certified, and you should confirm the UL listing from the label on the appliance or the manual.
"UL approved" is not quite the right phrase
UL does not approve products; it lists them. A listing means a sample was tested to the standard and the manufacturer is subject to ongoing factory follow-up inspections. The distinction matters when reading a listing mark, because other laboratories test to the same standard: Intertek (ETL), CSA, OMNI-Test, and Guardian all issue listings to UL 1482, and an ETL mark on a stove is exactly as valid as a UL mark. What you are checking for is a listing to UL 1482 by an accredited testing laboratory, not the UL brand specifically.
The mark itself lives on a permanent label, usually on the back or underside of the stove, alongside the model designation and the tested clearances. That label is the document an inspector will look for. If it is missing or illegible on a second-hand stove, most manufacturers publish current and archived manuals by model number, which is usually enough to establish the listing.
If the listing genuinely cannot be established, the appliance is treated as unlisted. That is not a technicality — it means NFPA 211’s 36-inch default clearance applies, which frequently makes the installation physically impossible in the space intended, and it is a common reason an insurer declines a claim after a fire.
Mobile and manufactured homes are a separate listing category
A stove approved for a manufactured home is listed for that use specifically, and the extra requirements come from HUD’s Manufactured Home Construction and Safety Standards at 24 CFR Part 3280 rather than from the base standard alone. Not every listed stove qualifies, which is why "mobile home approved" is a real search and a real shortlist rather than a marketing phrase.
The distinguishing requirements are consistent across manufacturers. Combustion air must be ducted from outside directly to the firebox, because a tightly built home cannot safely give up its own air to the fire. The stove must be permanently secured to the floor structure so it cannot shift in transit or in use. The chimney must be a listed factory-built system fitted with a spark arrestor and cap, and the installation must follow the appliance manual to the letter.
Practically, this narrows the field considerably and tends to favour smaller stoves with an outside-air kit offered by the manufacturer. If you are shopping for a manufactured home, treat the outside-air provision and the mobile-home listing as filter criteria from the start rather than something to resolve after purchase — retrofitting an outside-air duct to a stove never listed for it does not make the installation compliant.
Frequently asked questions
What is UL 1482?
It is the Standard for Solid-Fuel Type Room Heaters — the fire-safety listing for freestanding wood and pellet stoves. Testing puts the appliance in a mock-up with combustible walls, ceiling, and floor and limits how hot those surfaces may get; the distances at which the stove passed become the clearances in its manual. It also covers construction, door and latch integrity, ash handling, and floor protection.
Is a UL listed wood stove the same as EPA certified?
No, and they are not substitutes. UL 1482 is fire safety: clearances, surface temperatures, construction. EPA certification is emissions only, under 40 CFR 60 Subpart AAA. A stove can hold one without the other, most permits require both, and it is the UL listing — not the EPA certificate — that establishes how close to a wall the stove may sit.
How do I tell if a wood stove is UL listed?
Look for a permanent label, usually on the back or underside, giving the model, the testing laboratory, and the tested clearances. Listings to UL 1482 are also issued by Intertek (ETL), CSA, OMNI-Test, and Guardian, so a non-UL mark from an accredited lab is equally valid. If the label is gone, the model’s manual will normally state the listing.
What makes a wood stove mobile home approved?
A listing specifically for manufactured-home use, meeting HUD’s standards at 24 CFR Part 3280 on top of the base safety listing. In practice that means outside combustion air ducted directly to the firebox, permanent anchoring to the floor structure, and a listed factory-built chimney with a spark arrestor. Not every listed stove carries this, so check before buying — an outside-air kit added later does not create the listing.
Can I install a stove that has no UL label?
You can, but it is treated as unlisted, which means NFPA 211’s generic defaults apply: 36 inches to combustible walls and ceilings for a radiant stove, and 18 inches for single-wall connector pipe. That often makes the installation impractical in the intended space, and an unlisted appliance is a routine reason for an inspection failure or a declined insurance claim.