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Harvia Cozy Heat OG Thru-Wall Sauna Stove - 4745010348082

Harvia Cozy Heat OG Thru-Wall Sauna Stove - 4745010348082

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Harvia  Cozy Heat OG Thru-Wall Sauna Stove - 4745010348082

Cozy Heat has elevated the time-honored tradition of building  with the hand-crafted OG-TW, made in Estonia, where sauna bathing is a national custom. The innovative "Through-the-Wall" design allows you to load firewood from outside the sauna, keeping the interior clean and comfortable. This stove provides mild, long-lasting heat, ideal for pouring water over hot stones to create the perfect steam for an authentic sauna experience. Built for exceptional durability, the flame cutter is crafted from sturdy 5mm-thick stainless steel, ensuring lasting performance. The elegant, trilateral design with sleek lines and a contemporary finish adds sophistication to any sauna, creating a luxurious ambiance. Experience the ultimate in comfort and style with the  OG-TW!

What our Experts Think
  • Premium Estonian-engineered through-wall wood sauna stove designed for authentic Nordic sauna performance
  • Unique external loading system lets you feed firewood from outside the sauna for improved comfort and safety
  • Produces mild, steady radiant heat ideal for long, relaxing sauna sessions without harsh temperature spikes
  • Optimized for high-quality löyly (steam bursts) when water is poured over properly heated stones
  • Heavy-duty steel construction with reinforced firebox for high durability and long service life
  • Advanced airflow design supports cleaner combustion and improved fuel efficiency compared to standard stoves
  • Engineered for stable heat distribution in medium to large sauna cabins (depending on kW configuration)
  • Built for users seeking a true traditional wood-fired sauna experience with modern convenience
Q&A

Q: What is the Harvia Cozy Heat OG Thru-Wall Sauna Stove used for?
A: It is a wood-burning sauna stove designed to efficiently heat sauna rooms while allowing firewood loading from outside the sauna through a wall-mounted design.

Q: What is the main advantage of the thru-wall design?
A: It improves convenience and cleanliness by letting you feed wood from outside the sauna, reducing heat loss and indoor smoke exposure.

Q: What sauna size is it suitable for?
A: It is typically suited for small to medium sauna rooms (around 210–635 cu.ft., depending on configuration and insulation).

Q: Is this a wood-fired stove?
A: Yes, it is a traditional wood-burning heater that produces strong, natural sauna heat and rich steam when water is poured on stones.

Q: What makes its performance efficient?
A: It features optimized combustion, durable 5mm steel components, and fuel-efficient design for long-lasting heat output.

Q: What material is it made from?
A: Heavy-duty steel construction with reinforced firebox areas designed for high heat resistance and long service life.

Q: Does it require professional installation?
A: Yes, professional installation is recommended for safe chimney routing, wall penetration setup, and ventilation compliance.

Q: Why choose this stove?
A: It combines authentic wood-fired sauna experience, space-saving thru-wall loading, and durable engineering from Harvia, a globally trusted sauna brand known for reliability.

Maintenance Tips
  • Empty ash tray after each use to maintain strong airflow and efficient combustion.
  • Clean firebox and remove soot buildup regularly for safer, cleaner burning.
  • Inspect thru-wall loading chamber and door seals for heat wear or gaps.
  • Use only dry, seasoned firewood to reduce creosote and improve stove efficiency.
  • Re-stack sauna stones periodically; replace cracked or crumbling stones for consistent steam quality.
  • Ensure stone placement allows proper airflow to prevent overheating.
  • Keep external loading hatch and ventilation paths clear of debris.
  • Wipe exterior surfaces after cooling to prevent rust and maintain finish.
  • Schedule annual chimney and flue cleaning to ensure safe draft and long-term performance.