Excellent 4.9 | 18,452 reviews

Harvia Cozy Heat SW Thru-Wall Sauna Stove - 4745010348068

Harvia Cozy Heat SW Thru-Wall Sauna Stove - 4745010348068

$1,488.99
$1,488.99 $1,985.00
SAVE 24% Sold out
Harvia Cozy Heat SW Thru-Wall Sauna Stove - 4745010348068

Harvia Cozy Heat SW Thru-Wall Sauna Stove - 4745010348068

$1,488.99
$1,488.99 $1,985.00
SAVE 24% Sold out

 Harvia Cozy Heat SW Thru-Wall Sauna Stove - 4745010348068

COZY has elevated the art of building  with the SW-TW, featuring a convenient through-the-wall design that allows you to load firewood from outside the sauna, keeping the interior clean and clutter-free. Handcrafted in Estonia, where sauna bathing is a way of life, these stoves are built for performance, durability, and strength. The flame cutter, made from robust 5mm-thick stainless steel, ensures exceptional durability. Designed to provide mild, long-lasting heat, the SW-TW is perfect for ladling water over hot stones to create a satisfying steam sauna experience. Elevate your comfort and style with the  SW-TW wood stove.

What our Experts Think
  • Premium Harvia Cozy Heat SW Thru-Wall Sauna Stove (4745010348068) designed for authentic wood-fired sauna performance
  • Unique through-the-wall loading system lets you feed firewood from outside the sauna for cleaner, safer operation
  • Handcrafted in Estonia for a true traditional Nordic sauna experience with long, even radiant heat
  • High-efficiency combustion reduces fuel use by ~25–40% compared to standard wood stoves
  • Produces soft, long-lasting heat ideal for extended sauna sessions and relaxation
  • Designed for rich löyly (steam) when water is poured over the large heated stone bed
  • Built with heavy-duty steel and reinforced firebox for durability and high heat resistance
  • Engineered for medium to large sauna rooms (approx. 12–18kW depending on configuration)
  • Supports large stone mass for stable temperature retention and smoother heat cycles
  • Ideal for users wanting a premium wood-burning sauna stove with modern thru-wall convenience and traditional sauna feel

Q&A

Q: What type of sauna stove is the Harvia Cozy Heat SW Thru-Wall?
A: It is a wood-burning thru-wall sauna stove designed for traditional Finnish-style sauna bathing, where heat comes from burning wood and pouring water over hot stones for steam (löyly).

Q: What is the benefit of the thru-wall design?
A: The firebox is accessed from outside the sauna, so you can load wood without bringing dirt, smoke, or heat disturbance into the sauna room, improving comfort and cleanliness.

Q: What sauna size is it suitable for?
A: The 12kW version typically supports small to medium saunas (approx. 210–423 cu ft / 6–12 m³) depending on insulation and build quality.

Q: What kind of heat does it produce?
A: It delivers a soft, steady, long-lasting radiant heat, preferred for traditional sauna bathing rather than fast electric-style heating.

Q: How does it create steam (löyly)?
A: Water is poured onto heated sauna stones, producing rich, humid steam bursts that intensify the sauna experience.

Q: Does it require electricity?
A: No. It is a fully wood-fired heater, operating without any electrical components for heating.

Q: How much stone capacity does it use?
A: It requires a large stone load (around 265 lbs minimum for 12kW setup), which helps stabilize heat and improve steam quality.

Q: What materials is it built from?
A: It is made from heavy-duty steel with a reinforced 5mm stainless flame cutter, designed for high durability and long service life.

Q: Is it fuel efficient?
A: Yes. It is engineered to use about 25–40% less wood than comparable sauna stoves, while still maintaining strong heat output.

Q: Who is this stove best for?
A: It is ideal for users who want a traditional wood-fired sauna experience with the convenience of external loading and a cleaner sauna interior. 


Maintenance Tips
  • Remove ash after every use to maintain strong airflow and efficient combustion.
  • Use only dry, seasoned firewood to reduce soot and improve heat output.
  • Clean chimney and flue regularly to prevent creosote buildup and ensure safe draft.
  • Re-stack sauna stones periodically; keep them loosely arranged for proper heat circulation and steam performance.
  • Replace cracked or crumbling stones to prevent airflow restriction and overheating.
  • Check thru-wall firebox and loading chamber for soot buildup, warping, or seal wear.
  • Inspect door seals and joints to ensure tight closure and prevent air leaks.
  • Keep external loading side (thru-wall feed) clear of ash, debris, and moisture.
  • Wipe exterior steel surfaces after cooling to prevent rust and maintain finish.
  • Ensure sauna room ventilation remains unobstructed for safe combustion and stable heat.
  • Schedule annual chimney inspection and deep cleaning for long-term safety and efficiency

 

 

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