EPA-Certified Wood Stoves

What certification actually certifies

EPA's Burn Wise page describes an EPA-certified stove as one independently tested by an accredited laboratory to meet a particulate emissions limit. Particulate matter is the fine smoke that leaves the chimney. The test is about emissions, measured in grams of particulate per hour of burning. The Department of Energy puts the practical upshot simply: all woodstoves sold today should bear an EPA certification sticker.

Certification is a property of the model as manufactured. It does not describe a particular installation, the chimney it is connected to, or how the owner burns it. Those things decide much of how clean and safe a stove is in a real house, and they are covered further down.

How the limits have changed

The federal standards for new residential wood heaters date to 1988. The current rule was issued in 2015 and phased in over five years:

The eCFR text of 40 CFR 60.532 still showed these as the current limits, last amended in April 2020, when this guide was checked in October 2026.

Crib wood or cord wood: why two numbers

A stove can be certified using one of two test fuels. EPA describes crib wood as cut 2x4 or 4x4 lumber stapled together in a standard arrangement, and cord wood as typical firewood, which it calls a better measure of how a heater will perform in homes. The cord wood limit is set slightly higher than the crib wood limit.

When comparing two models, check which fuel each was tested with before comparing their emission numbers. EPA's fact sheet for the 2015 rule also mentions an optional label recognizing stoves tested with cordwood.

Which appliances the rule covers

According to 40 CFR 60.530, the standards apply to residential wood heaters manufactured or sold on or after May 15, 2015, including adjustable burn rate wood heaters, single burn rate wood heaters and pellet stoves. EPA's 2015 rulemaking also set standards for outdoor wood-fired hydronic heaters and indoor wood-fired forced-air furnaces.

The same section exempts or excludes:

• cookstoves and camp stoves, from the emission limits,
• coal-only heaters and corn-only pellet stoves, if their advertising and warranties exclude wood burning,
• residential masonry heaters, and
• manufactured and site-built masonry fireplaces, which the rule describes as not being residential heating devices.

So a masonry fireplace has no EPA emission certificate. A wood-burning fireplace insert is built as a heater, so check its label and database listing the same way you would for a freestanding stove.

Checking a stove you own or are thinking of buying

1. Find the labelEPA's fact sheet says new stoves must carry a permanent label showing that they are EPA-certified. Look for it on the stove body; it is separate from the safety listing label.
2. Look the model upEPA's Certified Wood Heater Database, maintained by its enforcement office and updated as recently as September 2026, can be searched by manufacturer or model. It lists heater type (catalytic or non-catalytic), efficiencies, emission rates and carbon monoxide values, and shows which models meet the 2020 Step 2 limits.
3. Get the manualThe manual sets the clearances, chimney type, floor protection and operating instructions. A used stove without its manual is harder to install correctly.
4. Inspect the stove itselfCracks, warped baffles, missing air control parts, worn gaskets or a damaged catalyst change how it burns, whatever the label says.

If you already own an older stove, EPA's fact sheet states that the standards apply only to new wood heaters and do not affect stoves already in use in homes.

What the label does not tell you

• Whether it is installed safely. Clearances, floor protection and the chimney connection come from the manual and local code. See clearances to combustibles and wood stove venting.
• Whether the chimney suits it. A certified stove connected to a large, cold, unlined flue can still draft poorly and build creosote. See liner options.
• How it will burn with your wood. The test uses controlled fuel. Wet wood makes more smoke in any stove. See burning the right firewood.
• Whether it is the right size. A stove too large for the space gets turned down, and slow, smoldering burns are the smokiest way to run any stove. Size the stove to the space it actually needs to heat.

The rule itself expects owners to do their part. Subpart AAA lists prohibited fuels, including garbage, plastics and construction debris, and requires operation in line with the owner's manual.

Catalytic, non-catalytic and hybrid stoves

The database sorts certified stoves by type. Catalytic stoves use a catalytic combustor in the smoke path, and the federal rule includes provisions specific to stoves equipped with one. Non-catalytic stoves meet the limit without a combustor. Some designs combine features of both. How each one is run and maintained differs, especially around the catalyst. Our guide to catalytic vs. non-catalytic wood stoves covers the choice in detail, and insert or freestanding stove? covers where the stove goes.

What to confirm before you buy

When you are comparing stoves, these details are worth getting in writing for the exact model:

• The model number as it appears in EPA's database, and whether it is listed as meeting the 2020 Step 2 limit.
• Which test fuel the emission figure came from, crib wood or cord wood.
• The efficiency and carbon monoxide figures in the database, compared on the same basis across models.
• The chimney the manual requires: liner type and size for a masonry chimney, or the listed factory-built chimney.
• The manual's clearance and floor protection figures, checked against the room where the stove will go.
• Whether the stove needs outside combustion air in a tight house.

The Department of Energy notes that EPA-certified pellet stoves are likely to fall in the 70 to 83 percent efficiency range, which gives a sense of how far apart models can be.

A note on EPA's Burn Wise pages

EPA's consumer program for wood burning, Burn Wise, officially ended on October 30, 2025. Its pages remain online as a historic record and are no longer updated. The certified wood heater database is a separate compliance page that EPA continues to update. The emission rule itself is in the Code of Federal Regulations and is not affected by the program change.

A cleaner stove still needs a chimney check

A certified stove produces less smoke when it is burned well, but it still makes creosote, especially when run slowly with wet wood. The Department of Energy recommends having a wood-burning system inspected every year, preferably before each heating season, and considering professional installation for safety and efficiency. When a new stove replaces an old one, the chimney and liner should be checked for the new stove's requirements, since a liner sized for the old stove may not match the new manual. Once the stove is in use, follow the manual's interval for checking the connector and chimney for creosote. See inspection before a new appliance and wood stove installation and service.

Questions homeowners ask

Sources

1. 40 CFR 60.532, What standards and associated requirements must I meet? (Standards of Performance for New Residential Wood Heaters), eCFR
2. 40 CFR 60.530, Who is affected by this subpart? (Standards of Performance for New Residential Wood Heaters), eCFR
3. U.S. EPA Burn Wise: EPA Certified Wood Stoves (archived program page)
4. U.S. EPA: EPA Certified Wood Heater Database (compliance page)
5. U.S. EPA: Fact Sheet, Summary of Requirements for Woodstoves and Pellet Stoves (2015 rule; January 2025 snapshot)
6. U.S. Department of Energy, Energy Saver: Wood and Pellet Heating

This guide is general information. It can't diagnose a specific chimney; an inspection can.