Through-Wall Sauna Stoves
A through-wall stove sits in the sauna while its firebox extension passes through the wall behind it, so you load and light it from the next room or from outside. The wood, the ash and the cold draught of an opening door stay out of the hot room. HUUM calls these LS models, Harvia calls them SL and Cozy calls them TW. The Harvia Duo goes one step further and puts a fireplace on the other side of the wall.
The wall does the real work. Every stove here needs an opening in a non-combustible wall, and each product page states the minimum opening and what the wall around it has to be, taken from the current manual. In a kit sauna that means cutting and reinforcing the back wall and building out a masonry or metal section before the stove arrives, so plan it with the sauna, not after.
Sizing works like any wood stove: measure the hot room in cubic feet, add for glass and other uninsulated surfaces, and match the stove’s rated range. Stones and a code-compliant chimney system are separate unless the listing is a package with stones.
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HUUM HIVE Wood-Burning Sauna Stove | 13, 17 & 17 LS
Price range: $2,150.00 through $2,618.00HUUM HIVE Wood surrounds a heavy firebox with 199 to 287 lb of stones, bringing gentle, water-rich steam to off-grid and wood-fired saunas from 212 to 565 cubic feet. Choose 13 kW, 17 kW, or 17 LS with an extended firebox for feeding from an adjacent room. Stones and a code-compliant chimney system are required and sold separately.
17 LS wall opening: at least 18.9 in tall x 12.6 in wide (480 x 320 mm) through a non-combustible wall; the firebox extension projects 7.3 in (185 mm) from the stove body.
Harvia Duo Fireplace and Wood Sauna Stove Combo
Price range: $2,871.00 through $3,415.00The Harvia DUO line is a stunning best-of-both-worlds fireplace and sauna spanning two rooms. It’s the most elegant solution to for through-wall sauna operation.
Wall opening: at least 15.9 in wide x 19.1 in tall from the floor (405 x 485 mm), in a concrete or brick wall; plan on 4.7 in (120 mm) maximum wall thickness.
Harvia Pro Series
Price range: $1,559.00 through $2,364.00The Harvia Pro Series is the value line for medium saunas. While most default to the popular Harvia M3, the Pro line is larger and has options like built in water tanks (ES), through-wall feed (SL), and designed for easy maintenance and cleaning. The Pro Series can also be paired with an in-chimney water heater, and has great short clearances when paired with the surround and floor protector. The Harvia Pro Series has fewer stones so it heats faster than rock basket heaters, but will not provide as ‘soft’ of a heat as something like a Harvia Legend.
The Harvia Pro comes in three sizes (20, 26, 36) for small and medium saunas.
Pro 20 SL wall opening: at least 8.7 in wide x 15.4 in tall from the floor (220 x 390 mm), in a concrete or brick wall no more than 5.9 in (150 mm) thick. The Pro 20 LS is the left-side water-tank model, not the through-wall one.
Cozy Heat Quattro Thru-Wall Sauna Stove Package with Stones
Price range: $2,686.50 through $3,532.50Choose crisp geometry and outside loading first. The square Quattro cage belongs in the room; the loading door and woodpile belong on the other side. Cozy builds the stove with structural-steel firebox walls about 67% thicker than a typical standard-stove wall and clean welds.
It uses about 25% less wood than comparable heaters without making the fire fussy. Pick 12 or 18 kW, then select the matched stone finish and box count. Chimney, wall construction, and required protection remain separate.
Wall opening: 12 kW at least 10.0 in wide x 17.3 in tall from the floor; 18 kW at least 12.4 x 18.5 in. Concrete or brick, 5.9 in thick at most.
Cozy Heat SW Thru-Wall Sauna Stove Package with Stones
Price range: $2,686.50 through $3,424.50The big decision is the tall through-wall stove. The SW profile stays in the sauna while the loading door and firewood stay outside it. The core combines structural-steel firebox walls about 67% thicker than a typical standard-stove wall with clean, precise welds.
Three-path combustion uses about 25% less wood than comparable heaters while tending remains as familiar as a normal wood stove. Choose 12 or 18 kW, then finish the selection with the matched stone style and box count. Chimney, wall work, and required protection remain separate.
Wall opening: 12 kW at least 10.0 in wide x 17.3 in tall from the floor; 18 kW at least 12.4 x 18.5 in. Concrete or brick, 5.9 in thick at most.
Cozy Heat OG Thru-Wall Sauna Stove Package with Stones
Price range: $2,686.50 through $3,505.50Start with the sculpted through-wall stove. The OG’s flared cage stays in the room while the loading door, ash, and woodpile move next door. Its structural-steel firebox walls about 67% thicker than a typical standard-stove wall are finished with clean welds.
The three-path burn uses about 25% less wood than comparable heaters, yet the fire remains as manageable as a familiar wood stove. Choose 12 or 18 kW, then the matched stone option. Chimney, wall construction, and required protection remain separate.
Wall opening: 12 kW at least 10.0 in wide x 17.3 in tall from the floor; 18 kW at least 12.4 x 18.5 in. Concrete or brick, 5.9 in thick at most.
Cozy Heat O Thru-Wall Sauna Stove Package with Stones
Price range: $2,475.00 through $3,280.85Choose the round through-wall stove before the finishing details. The O cage stays visible while bark, ash, and refueling move to the adjoining room. Cozy builds it with structural-steel firebox walls about 67% thicker than a typical standard-stove wall and clean welds.
It uses about 25% less wood than comparable heaters and still lights and tends like a familiar wood stove. Select 12 or 18 kW, then the exact stone style and box count. Chimney, wall construction, and required protection remain separate.
Wall opening: 12 kW at least 10.0 in wide x 17.3 in tall from the floor; 18 kW at least 12.4 x 18.5 in. Concrete or brick, 5.9 in thick at most.
Cozy Heat Thru-Wall Sauna Stove Package with Stones
Price range: $2,583.00 through $3,334.50The through-wall routine is the reason to choose this package. Keep the open Cozy cage in view while tending the fire next door. The stove combines structural-steel firebox walls about 67% thicker than a typical standard-stove wall with clean welds for years of normal use.
Three-path combustion uses about 25% less wood than comparable heaters without making the fire fussy. Select 12 or 18 kW, then choose the matched stone style and box count. Chimney, wall construction, and required protection remain separate.
Wall opening: 12 kW at least 10.0 in wide x 17.3 in tall from the floor; 18 kW at least 12.4 x 18.5 in. Concrete or brick, 5.9 in thick at most.
Cozy Heat Quattro Thru-Wall Wood-Burning Sauna Stove – 12 & 18 kW
Price range: $2,452.50 through $2,884.50Keep the crisp geometry and move the tending routine outside. Quattro Thru-Wall leaves the square cage in the sauna and extends the firebox through the wall. Its structural-steel firebox walls about 67% thicker than a typical standard-stove wall are finished with clean welds.
Three-path combustion uses about 25% less wood than comparable heaters, yet lighting and refueling feel like a familiar wood stove. Choose 12 or 18 kW. Stones, chimney, wall detailing, and required protection are separate.
Wall opening: 12 kW at least 10.0 in wide x 17.3 in tall from the floor; 18 kW at least 12.4 x 18.5 in. Concrete or brick, 5.9 in thick at most.
Cozy Heat SW Thru-Wall Wood-Burning Sauna Stove – 12 & 18 kW
Price range: $2,452.50 through $2,884.50Big vertical presence, with the fire door elsewhere. The SW Thru-Wall keeps its high wave-pattern cage inside and moves the active wood routine next door. Cozy joins structural-steel firebox walls about 67% thicker than a typical standard-stove wall with clean welds beneath that stone column.
It uses about 25% less wood than comparable heaters, but starting and tending still feel like a normal wood stove. Choose 12 or 18 kW. Stones, chimney, wall detailing, and required protection are separate.
Wall opening: 12 kW at least 10.0 in wide x 17.3 in tall from the floor; 18 kW at least 12.4 x 18.5 in. Concrete or brick, 5.9 in thick at most.
Cozy Heat OG Thru-Wall Wood-Burning Sauna Stove – 12 & 18 kW
Price range: $2,452.50 through $2,857.50Give the sauna the silhouette and the adjoining room the wood handling. The OG Thru-Wall pairs its flared guard with an extended firebox. The working core uses structural-steel firebox walls about 67% thicker than a typical standard-stove wall and clean welds for long service.
It burns about 25% less wood than comparable heaters while lighting and tending like a normal wood stove. Pick 12 or 18 kW. Stones, chimney, wall detailing, and required protection are separate.
Wall opening: 12 kW at least 10.0 in wide x 17.3 in tall from the floor; 18 kW at least 12.4 x 18.5 in. Concrete or brick, 5.9 in thick at most.
Cozy Heat O Thru-Wall Wood-Burning Sauna Stove – 12 & 18 kW
Price range: $2,182.50 through $2,416.85Clean round lines inside, firewood outside. The O Thru-Wall keeps its cylindrical cage in the sauna and puts the loading door in the adjoining room. That profile surrounds structural-steel firebox walls about 67% thicker than a typical standard-stove wall, joined with clean welds.
Three-path combustion uses about 25% less wood than comparable heaters, but the fire still behaves like a familiar wood stove. Choose 12 or 18 kW. Stones, chimney, wall detailing, and required protection are separate.
Wall opening: 12 kW at least 10.0 in wide x 17.3 in tall from the floor; 18 kW at least 12.4 x 18.5 in. Concrete or brick, 5.9 in thick at most.
Cozy Heat Thru-Wall Wood-Burning Sauna Stove – 12 & 18 kW
Price range: $2,290.50 through $2,578.50Move the woodpile and ash to the adjoining room. The original open cage stays in the sauna while the firebox passes through a properly built wall. The stove is built around structural-steel firebox walls about 67% thicker than a typical standard-stove wall, joined with clean welds for a durable core.
The three-path burn uses about 25% less wood than comparable heaters, yet lighting and refueling still feel like a familiar wood stove. Choose 12 or 18 kW. Stones, chimney, wall detailing, and required protection are separate.
Wall opening: 12 kW at least 10.0 in wide x 17.3 in tall from the floor; 18 kW at least 12.4 x 18.5 in. Concrete or brick, 5.9 in thick at most.
Harvia M3 SL Wood-Burning Sauna Stove | 16.5 kW Through-Wall Feed (WKM3SL)
$1,416.00The M3 with its fire chamber extended through the wall, so the stove is loaded and lit from the next room. 16.5 kW for sauna rooms of 212–459 adjusted cubic feet, 66.1 lb of 4–6 in stones, 105.8 lb net, top flue connection at 4.6 in. Harvia’s SL instructions call for a minimum 19.7 in safety distance to the front, and the door’s opening direction can be changed.
Wall opening: at least 8.7 in wide x 15.4 in tall from the floor (220 x 390 mm), in a concrete or brick wall no more than 5.9 in (150 mm) thick.
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