New Sauna Smell and Burn-In: What's Normal

Where the first-use smell comes from

If your new sauna smells like wood, resin, or warm varnish, that is usually the cabin itself. Sauna interiors use species like cedar, hemlock, pine, spruce, alder, aspen, or basswood. Each has its own natural aroma, and heat releases oils and resins embedded in the wood. This is part of the charm of a new sauna, and it tends to weaken over weeks of use.

The heater is the second source. New heating elements, whether electric coils or infrared emitters, often carry a thin protective layer from manufacturing. On the first few heatings, that layer burns off and produces a distinct, sometimes smoky smell. The same applies to new stones, which can release dust or mineral odor when first heated.

Traditional saunas and infrared saunas differ in how much heat they produce and therefore how strong this initial odor is. Cleveland Clinic notes that traditional saunas typically run between 150 and 195 degrees Fahrenheit, while infrared units stay lower, around 110 to 135 degrees. Hotter air carries more volatiles, so a traditional sauna may smell stronger at first.

• Wood species: cedar, hemlock, pine, spruce, alder, aspen, basswood, or thermowood each have unique aromas.
• Heater element: protective coatings burn off in the first few runs.
• Stones: new stones release dust or mineral scent when heated.
• Cabin adhesives and finishes: use of oils, waxes, or glue can add to the initial smell.

What the burn-in process involves

Burn-in, also called the first firing, is the recommended procedure for a new heater or new sauna before you sit inside. It means running the heater empty, without anyone in the cabin, to let protective oils and manufacturing residues evaporate. This is not optional: skipping it can leave you inhaling fumes during your first real session.

Every maker publishes a specific burn-in routine in the manual. Some ask you to run the heater at maximum temperature for an hour, others for a shorter time. Follow the manual, not a general rule, because element types and coatings differ. If you bought a sauna kit, the manual for the heater is the one that matters most.

During burn-in, the room should be well ventilated. Open windows or doors if possible, and keep the sauna door slightly ajar so the smell does not linger in the cabin. You may also see light smoke, which is normal while the coating burns off. Do not use the sauna until the smoke has cleared and the smell has mostly gone.

For infrared saunas, the same idea applies but the odor is usually milder. The emitters are lower-temperature than electric coils, so they take longer to burn off. Run the infrared unit empty for the time stated in the manual, then let it cool before you wipe down the interior.

• Read the manual: find the burn-in section for your heater or sauna model.
• Clear the cabin: remove any packaging, plastic, or cardboard before firing.
• Ventilate: open windows and keep the sauna door ajar.
• Run empty: set the heater to the recommended temperature, typically maximum.
• Time it: follow the manual, often 30 to 60 minutes.
• Cool and wipe: after the burn-in, let the sauna cool and wipe surfaces with a damp cloth.

Step-by-step first burn-in

Here is a practical sequence that works for most electric sauna heaters. Start by reading the manual to confirm the exact timing and any special steps. Then do a general New Sauna Smell and Burn-In of the interior: wipe the benches and walls with a dry or slightly damp cloth to remove sawdust from shipping.

Place the heater stones according to the manual if it is a traditional sauna. New stones should be rinsed first to remove dust, then stacked loosely so air can flow. The manual for your heater tells you the correct arrangement, and the Types of Sauna Stones page explains the differences between stone types.

Turn the heater on at the highest setting, close the door, but keep a window or door near the sauna open for ventilation. Set a timer for the duration the manual specifies. If you smell smoke, that is expected, but if the smell becomes acrid or causes eye irritation, shut the heater off and let it cool, then check for anything left inside.

After the burn-in, let the sauna cool completely. Then wipe all surfaces again, including the heater body once it is safe to touch. This removes any residue left by the burning process. The A Burning Smell From a Heater article offers more detail on what is normal and what is not.

When the smell should worry you

Most first-use smells fade within a few sessions. But some smells are not normal. If you notice a strong chemical or solvent odor, or if the smell persists after several heatings, stop using the sauna and contact the manufacturer. A persistent odor may indicate a problem with a component, adhesive, or finish.

Look for certification marks on the heater or cabin. The What Does UL Listed Mean for a Sauna or Heater article explains what marks like ETL mean. Intertek, for instance, certifies that a product has been independently tested to safety standards. A certified heater is less likely to have a coating issue that creates a lasting smell.

Also trust your body. If the smell gives you a headache, nausea, or breathing trouble, leave the sauna and ventilate the space immediately. These symptoms can come from inhaling fumes that a proper burn-in should have removed. Do not try to wait it out inside the cabin.

A separate concern is mold or mildew. If the smell is musty rather than sharp or smoky, it may be moisture trapped in the wood rather than a burn-off smell. The Preventing Mold After Use page covers how to prevent that, but on a brand-new sauna, a musty smell is unusual and worth a call to the seller.

• Chemical or solvent smell that does not fade after 2 to 3 heatings
• Smoke that continues after the first burn-in is complete
• Headache, nausea, or dizziness during or after use
• Musty, wet odor that suggests moisture damage

How long the new-sauna smell lasts

There is no single answer, because it depends on how often you use the sauna, how hot you run it, and whether you follow the burn-in. In regular use, most owners report that the strong odor fades within a few weeks. The wood aroma may remain, but it becomes a background note rather than the main event.

To speed the process, use the sauna more frequently for short sessions rather than saving it for once a week. Each heating cycle helps release the volatiles. Keeping the room dry after use also helps, since moisture can trap odors in the wood.

If you have an infrared sauna, expect a slower fade because the lower temperatures release less volatile material per session. Running the unit empty a few times, as recommended in the manual, is the surest way to clear the smell faster.

What to pick for your use

Questions

How long does the new sauna smell last?

The strong smell, especially from the heater, usually fades after the first 1 to 3 heatings. The lighter wood aroma may last for a few weeks with regular use. Infrared units may take longer because they run cooler.

Can I sit in the sauna during burn-in?

No. Burn-in is meant to be run empty. The fumes and possible light smoke are not safe to inhale, and the heater is too hot to sit near safely. Wait until the manual's required time is up, then cool and wipe the cabin.

Do infrared saunas need a burn-in too?

Yes. Infrared emitters also have protective coatings that burn off on the first use, though the odor is usually milder than with traditional heaters. Follow the same procedure: run the unit empty, ventilate, and wipe down afterward.

Why did my heater smell like burning plastic?

A burning plastic smell is not typical. Normal burn-in smells like smoke or hot metal. If it smells like plastic or chemicals, check for any leftover packaging or tape near the heater. If the smell persists, contact the manufacturer.

Should I wash the stones before first use?

Yes, for traditional saunas. Rinse new stones to remove dust and debris before loading them into the heater. This cuts down on the initial mineral smell and helps the heater reach temperature more evenly.

Can I open the sauna door during burn-in?

It is better to keep the door shut so the heater heats the room, but ventilate the surrounding space with windows or an open door. If the manual says otherwise, follow it.