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Cozy Heat O Series Thru-Wall Sauna Stove

Original price $1,790.00 - Original price $2,675.00
Original price
$1,790.00
$1,790.00 - $2,675.00
Current Price $1,790.00
+ FREE SHIPPING
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Cozy Heat O Thru-Wall Sauna Stove - Wood-Burning Sauna Heater

Traditional Sauna Heat with a Clean and Convenient Thru-Wall Design

Cozy Heat O Thru-Wall Sauna Stove

Looking for the authentic warmth of a wood-fired sauna but prefer to keep firewood and ash outside your sauna room? The Cozy Heat O Thru-Wall Sauna Stove offers the best of both worlds.

Handcrafted in Estonia, where sauna culture is deeply rooted, this wood-burning sauna heater delivers gentle, long-lasting heat while allowing you to ladle water over the stones for an intensely relaxing steam experience.

The thru-wall design means you can load firewood from outside your sauna, keeping the interior tidy and maximizing your relaxation. At the heart of this stove is its innovative circular rim design, which not only enhances aesthetics but also ensures even heat distribution throughout your sauna space.

Plus, with up to 40% better fuel efficiency and 6x cleaner smoke emissions, it's an eco-friendly and cost-effective heating solution for cabins, backyard saunas, or off-grid retreats.

Cozy Heat O Thru-Wall Sauna Stove Features

  • Thru-Wall Firebox for a Clean Sauna Space: Load firewood from outside the sauna, keeping ash, debris, and clutter away from your relaxation zone.
  • Efficient Wood-Burning Heat: Provides deep, radiant warmth, perfect for traditional steam saunas.
  • Unique Circular Rim Design: Enhances aesthetic appeal and heat distribution, ensuring even warmth throughout your sauna.
  • Heavy-Duty Steel Construction: Built with 5mm-thick stainless steel, including a reinforced flame cutter for exceptional durability.
  • Highly Fuel-Efficient Performance: Burns 25-40% less firewood than comparable sauna stoves, reducing wood consumption and operating costs.
  • Eco-Friendly Emissions: Meets strict German BIMSCH certification, ensuring 6x cleaner smoke gases for a healthier sauna environment.
  • Minimal Safety Clearance Requirements: Designed for compact sauna spaces, requiring minimal safety distances.
  • Two Power Options for Different Sauna Sizes
    • 12kW Model: Heats saunas from 210 to 423 cu. ft.
    • 18kW Model: Heats saunas from 317 to 635 cu. ft.
  • Premium Sauna Stone Capacity
    • 12kW Model: Requires at least 265 lbs of stones.
    • 18kW Model: Requires at least 353 lbs of stones.
    • Additional stones are recommended to ensure optimal heat retention and steam production.
  • Included: Comes with a chimney pipe, heater body, cleaning hatch, glass door, ash box, and a detailed operation manual for easy setup.

O Series Thru-Wall Sauna Stove Specifications

Cozy O Thru-Wall 12 Model:

  • Power Output: 12kW
  • Sauna Room Size: 210 - 423 cu. ft.
  • Firewood Length: Up to 12.95" (329mm)
  • Firewood Diameter: 3.14" - 4.72" (80-120mm)
  • Weight: 125 lbs (Shipping Weight with Stones: 367 lbs)
  • Dimensions: 26.37" D x 17.71" W x 27.55" H
  • Safety Distances: 55.1" front-to-back, 33.06" left-to-right
  • Flue Connection: Top

Cozy O Thru-Wall 18 Model:

  • Power Output: 18kW
  • Sauna Room Size: 317 - 635 cu. ft.
  • Firewood Length: Up to 15.74" (400mm)
  • Firewood Diameter: 3.14" - 4.72" (80-120mm)
  • Weight: 181 lbs (Shipping Weight with Stones: 533 lbs)
  • Dimensions: 30.70" D x 19.88" W x 29.76" H
  • Safety Distances: 59.43" front-to-back, 39.75" left-to-right
  • Flue Connection: Top

Warranty: 2 Years

Download the Installation and Operation Manual

Upgrade your sauna with the ultimate wood-fired heater—crafted for efficiency, designed for comfort, and built for the perfect sauna experience.

Order Processing: Once you place your order, you'll receive an order confirmation email. Please allow 1-3 business days for processing. If there are any unexpected delays, we’ll reach out to you immediately.

Shipping Methods:

  • Freight Shipping: Saunas ship in large, crated packages and will be delivered via freight. The carrier will schedule a delivery appointment when the shipment is in your area.
  • Ground Shipping: Sauna accessories, heaters, & components ship in standard FedEx or UPS packages.

Delivery Timeline:

  • Delivery Timeline:

    • Processing: Please allow 1-3 business days for us to process your order.
    • Handling Time: This product should ship out in 3-5 business days days from the time it is processed.
    • Transit Time: Once shipped, we will send you the tracking number. Freight shipments typically take 3-10 business days, depending on your location.
    • Delivery Appointment: The carrier will contact you to set a delivery time. Someone must be present to receive the delivery.

    Receiving Your Shipment: Inspect your shipment for damage before signing the delivery receipt. For any issues, mark “DAMAGED, NEEDS REVIEW,” take photos, and contact us within 2-3 business days.

Installation & Setup:

Saunas are typically very simple to put together. Some are as easy as clamping the 4 walls together.

Electrical Requirements:

  • Most infrared saunas **plug into a standard 120V home outlet**.
  • Traditional saunas may require a **240V hardwired connection**, which should be installed by a licensed electrician.

Professional Installation: If you require assistance with setup, we can refer you to our preferred installation partners.

Space Considerations: Ensure proper ventilation and clearance before installation. Saunas should be placed on a **level, dry surface** away from moisture-sensitive materials.

Contact Us: To connect with an installer in your area or get a price quote, please call us at 888-995-4450 or email us at info@selectfitnessusa.com.

Sauna Warranty Coverage:

Select Fitness is an authorized dealer for every sauna we sell. All saunas include the manufacturer's original warranty.

Typical warranty coverage includes:

  • Heating Elements & Electronics: Covered for years.
  • Wood Panels & Structure: Covered against defects but does not include natural expansion or contraction of wood.
  • Control Panel & Internal Components: -year warranty.

For specifics on your sauna’s warranty, check the product details or contact us for more information.

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Sauna FAQs

General Questions
What’s the difference between an infrared sauna, a traditional sauna, and a hybrid sauna? +
Infrared saunas: Heat your body directly with infrared light for deep tissue penetration. Lower temperatures (120–150°F) make it easier to stay in longer. Known for relaxation, recovery, and potential wellness benefits.

Traditional saunas: Heat the air with electric heaters or wood-burning stoves. Higher temperatures (160–195°F) provide an intense, sweat-heavy experience, boosting circulation and overall wellness. Zero EMF output.

Hybrid saunas: Offer the benefits of both. They use infrared waves for deeper tissue penetration alongside much higher heats from a traditional sauna stove.
How do I choose the right sauna for me? +
Consider:
Person Capacity: How many people will use the sauna? A larger capacity sauna provides more space but takes up more room.
Indoor vs. Outdoor Use: Indoor saunas cannot be safely used outdoors. Choose the right option for your space.
Heating Style: Infrared, Traditional, or Hybrid.
Full Spectrum vs. Standard Infrared: Full Spectrum saunas provide near, mid, and far infrared. This is a desirable but generally more expensive feature.
EMF Levels: Low (<6–10 MG), Ultra Low (<3–5 MG), or Near Zero (<2 MG). Lower EMF is generally better, but more expensive.
What size saunas do you offer? +
We carry 1-person, 2-person, and up to 6-person+ models. Consider both interior comfort and available space when selecting a size.
Shipping & Delivery
How is my sauna shipped? +
Saunas ship via freight in large, crated boxes. A delivery appointment will be scheduled before arrival.
How much does shipping cost? +
We cover the shipping charge on all saunas. The price you see online includes FREE shipping!
Installation & Setup
Do saunas require professional installation? +
Infrared saunas: No, most models are plug-and-play and can be assembled in 1-2 hours.
Traditional saunas: Most are simple to set up but may require hardwiring by a licensed electrician.
What are the electrical requirements? +
1-2 person infrared saunas: Standard 120V outlet (some exclusions apply—check product details).
Larger infrared saunas & traditional saunas: Many will require a dedicated 240V wiring (professional installation highly recommended).
How long does it take to assemble a sauna? +
Most saunas take 30 minutes to 3 hours with two people and come with easy-to-follow instructions.
Usage & Maintenance
How long does it take to heat up? +
Infrared saunas: 10-15 minutes on average but depends on the model and number of heaters.
Traditional saunas: 30-45 minutes on average but depends on the model and number of heaters.
How do I clean my sauna? +
Wipe down with a damp cloth after each use.
For deep cleaning, use a vinegar-water mix—avoid harsh chemicals.
Specialty wood cleaner and treatment is advisable.
What type of wood is best for a sauna? +
Canadian Hemlock: Durable, affordable, and commonly used in infrared saunas.
Red Cedar: Premium, naturally rot-resistant, aromatic, and highly durable.
Basswood, Mahogany, and Fir: Alternative high-quality woods with varying aesthetics and insulation properties.
Warranty & Support
What is the warranty on my sauna? +
Every sauna includes a manufacturer’s warranty covering everything from the wood to the heaters and more. For specific warranty information, check the product details.
What if my sauna arrives damaged? +
Inspect your sauna upon delivery and note any damage before signing the receipt.
Contact us within 48 hours to start a claim.
Your sauna will be either serviced or replaced.
Who do I contact for warranty support? +
Contact info@selectfitnessusa.com or call 888-995-4450.
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“From the first consultation to delivery, Select Fitness made buying my sauna a seamless experience. The team answered all my questions, and now I get to enjoy the best part of my day—relaxing in my new infrared sauna.”

- Jordan W., 02/25
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