Harvia Legend 240 SL Legend Series 21kW Wood-Burning Sauna Stove w/Ext. Feed
The Harvia Legend 240 SL is a 21kW wood-burning sauna stove for large rooms from 353 to 848 cubic feet, with an extended fire chamber that passes through the sauna wall so firewood is loaded from an adjacent room, changing room, or outdoors - never from inside the sauna itself. This is the defining feature of the SL designation. No electricity required. The cast-iron glass door faces into the sauna room, letting the warm glow of the fire complement the sauna atmosphere, while the firebox opening faces outward for wood loading. Sauna stones (440 lbs, 10 boxes of AC3020, 10-15 cm) are required and sold separately. Delivery is by scheduled freight on a wooden pallet - not standard parcel service.
SL exterior feed - wood loaded from outside the sauna
The SL fire chamber extension is the central engineering feature of the Legend 240 SL. The stove body sits inside the sauna room with the stone cage, glass door, and radiant heat surfaces fully within the sauna. The fire chamber extends through the sauna wall via a purpose-built opening, terminating in a firebox door on the exterior side - in the changing room, utility room, veranda, or outdoors. Wood is loaded from this exterior firebox opening without entering the sauna room, without disturbing the bathers inside, and without carrying wood through the sauna space. This is the correct stove for any sauna build where loading wood inside the sauna room is impractical or undesirable: cabin saunas where wood storage is outside, combined sauna-fireplace rooms where the fire is tended from the adjacent lounge, and any installation where the sauna user experience should not be interrupted by wood loading. The door opening direction is reversible - set during installation to suit the room layout.
21kW and 440 lbs of stones - large room performance
At 21kW the Legend 240 SL is sized for rooms from 353 to 848 cubic feet - a wide range covering medium-to-large residential saunas and sauna buildings. The 440-lb maximum stone capacity (10 boxes of AC3020 at 10-15 cm) creates a large thermal mass that retains heat for extended sauna sessions. The large stone load is a characteristic of the entire Legend 240 lineage: once the stones are fully heated they continue radiating heat and producing steam long after the fire has died down, allowing long uninterrupted sessions without continuous firing. The black steel grate structure with two-stage combustion air separation - part of Harvia's Legend Series standard - ensures the 21kW output is produced cleanly and efficiently, reducing soot and extending grate lifespan.
Handcrafted by Harvia master blacksmiths - pallet delivery
The Harvia Legend 240 SL is described by Harvia as a handmade masterpiece crafted by Harvia's master blacksmiths in Finland - part of the Legend Series heritage that dates to Harvia's founding in 1950. At 165 lbs (75 kg) the stove ships on a wooden pallet via scheduled freight with a delivery appointment required. The driver delivers to the site; installation assistance is not included in delivery. Plan for on-site handling equipment or assistance to move the stove from the pallet delivery point to its installation position in the sauna room. A licensed or certified chimney professional is strongly recommended for all flue installations. The 6" North American flue adapter (Harvia WZ115155) is required and sold separately.
21kW wood-burning sauna stove for large rooms from 353 to 848 cubic feet. SL exterior feed - fire chamber extends through sauna wall, wood loaded from outside the sauna room. Cast-iron glass door faces into sauna. Reversible door direction. No electricity required. Two-stage combustion air grate - cleaner burn, longer lifespan. 440 lbs stones required (10 boxes AC3020 10-15 cm, sold separately). Reduced safety distances. Flue: 115mm (4.5") - 6" North American adapter required (sold separately). Adjustable legs. Optional pipe-mounted water heater. Handcrafted in Finland by Harvia master blacksmiths. 165 lbs. Pallet delivery - scheduled freight appointment required. 2-year warranty (consumer). CE certified. Made in Finland by Harvia.
21 kW 353 to 848 cu ft (10-24 m³) SL - exterior feed through sauna wall Wood loaded from outside sauna room Cast-iron glass door - faces into sauna Reversible door direction Wood-burning - no electricity required Two-stage combustion air grate 440 lbs AC3020 stones required (10 boxes, 10-15 cm) Reduced safety distances 115mm flue - 6" adapter required for North America Adjustable legs 165 lbs - pallet delivery required Handcrafted by Harvia master blacksmiths 2-year warranty (consumer) CE certified - made in Finland
⚠️ 440 lbs AC3020 stones (10 boxes, 10-15 cm) required - not included. 6" North American flue adapter required - not included. Pallet delivery. Stones and the 6" flue adapter must be purchased separately. An additional stone box is recommended. This stove ships by scheduled freight on a wooden pallet - a delivery appointment is required. Plan for on-site assistance to move the stove from the pallet delivery point to the installation position. A licensed chimney professional is recommended for all flue installations.
ℹ️ SL vs standard - which Legend 240 is right. Legend 240 SL (this listing, WKLE20SLM): fire chamber extends through the sauna wall - wood is loaded from outside the sauna room. Choose the SL for any installation where loading wood from inside the sauna is impractical or undesirable: cabin saunas with external wood storage, combined sauna-lounge rooms, or any layout where the firebox opening needs to face an adjacent room or outdoors. If loading wood from inside the sauna room is acceptable, a non-SL Legend 240 variant may be more appropriate for the installation.
Specifications
Performance
| Power output |
21 kW |
| Fuel type |
Wood - no electricity required |
| Room volume |
353 to 848 cu ft (10-24 m³) |
| Stone capacity (maximum) |
440 lbs (200 kg) |
| Stone requirement |
440 lbs - 10 boxes AC3020 (10-15 cm) - sold separately |
Physical
| Dimensions (H x W x D) |
32.7"H x 23.6"W x 23.6"D + 7.1" fire chamber extension (830 x 600 x 600 + 180 mm) |
| Weight |
165 lbs (75 kg) |
| Frame material |
Black steel |
| Door |
Cast-iron framed glass door |
| Door direction |
Reversible - set during installation |
| Mounting |
Floor-standing with adjustable legs |
Safety distances
| Sides |
210 mm (8.3") |
| Back |
250 mm (9.8") |
| Front |
1000 mm (39.4") |
| Upper surface to ceiling |
See Safety Sheet document below |
| Note |
Reduced vs standard wood stoves - flexible bench placement |
SL exterior feed and flue
| Firebox access |
From outside the sauna room via wall extension |
| Fire chamber extension |
180 mm (7.1") through sauna wall |
| Flue connection diameter |
115mm (4.5") - standard European |
| North American adapter |
6" (155mm) adapter required - sold separately |
| Delivery method |
Scheduled freight - wooden pallet - appointment required |
Legend Series wood stove comparison
| Legend 150 WK150LD |
16kW | 212-459 cu ft | 264 lbs (6 boxes) | Interior feed |
| Legend 240 SL WKLE20SLM (this listing) |
21kW | 353-848 cu ft | 440 lbs (10 boxes) | Exterior feed |
| M3 WKM3 |
16.5kW | 212-459 cu ft | 66 lbs (2 boxes) | Interior feed | Compact |
Optional accessories (sold separately)
| North American flue adapter |
Harvia WZ115155 (6" / 155mm) |
| Pipe-mounted water heater |
Harvia WL200 or WL300 |
| Protective sheath |
Harvia WL200 sheath - 1 to 3 as required |
| Flue pipe extensions |
Harvia WZ11520, WZ11550, WZ115100 |
What's included
Harvia Legend 240 SL wood-burning sauna stove with cast-iron glass door and fire chamber extension
Stove door (reversible direction)
Ash box
Adjustable legs
Installation and operation manual
Required (not included): 440 lbs AC3020 sauna stones - 10 boxes, 10-15 cm (an additional box recommended); 6" North American flue adapter (Harvia WZ115155). Optional accessories (sold separately): Pipe-mounted water heater (WL200 or WL300); protective sheath (WL200 - 1 to 3 as needed); flue pipe components (WZ11520, WZ11550, WZ115100). A licensed chimney professional is recommended for all flue installations.
Why the Harvia Legend 240 SL stands out
Exterior feed - undisturbed sauna sessions
The SL fire chamber extension makes it possible to load wood, tend the fire, and adjust combustion from outside the sauna room without opening the sauna door or disturbing bathers inside. In a cabin or outdoor sauna where wood is stored outside, this eliminates carrying firewood through the sauna space. In a combined sauna-lounge build, the person managing the fire can do so from the lounge while bathers enjoy the sauna uninterrupted. The reversible door direction allows the firebox opening to face left or right to suit the specific room layout.
440 lbs of stones - sustained heat, large rooms
The 440-lb stone capacity creates a thermal mass that heats large rooms from 353 to 848 cubic feet and holds heat for extended sessions after the fire dies down. A large stone mass is the definitive advantage of wood-heated sauna over electric: the stones accumulate hours of heat from the fire and release it slowly and evenly, producing sustained, consistent sauna temperature with a quality of radiant heat that large stone loads uniquely provide.
Cast-iron glass door - fire visible from inside
The cast-iron framed glass door faces into the sauna room - the warm glow of the fire is fully visible to the bathers throughout the session. The visual presence of fire through the glass is a key part of the wood-burning sauna atmosphere. Cast-iron framing provides the thermal mass and durability required at the sustained high temperatures of a 21kW wood fire over years of regular use.
Two-stage combustion air grate
The Legend Series grate structure separates combustion air into primary and secondary streams, directing secondary air to the upper fire chamber for more complete combustion. The result is cleaner burning with less soot, more efficient use of each firewood load, and reduced carbon buildup on the grate - extending the grate's service life. Over many sessions through years of use, cleaner combustion reduces chimney maintenance frequency and preserves the stove's internal structure.
Reduced safety distances - flexible bench placement
The Legend 240 SL has smaller than standard safety distances from its side and back surfaces to combustible materials: 210mm to sides, 250mm to back. These reduced clearances give sauna designers and builders more flexibility in bench placement within the large room range this stove covers. Confirmed safety distances are in the Safety Sheet document below - always verify these against the specific installation before finalising bench construction.
Handcrafted by Harvia master blacksmiths
The Legend 240 SL is described by Harvia as a handmade masterpiece crafted by their master blacksmiths in Finland - part of the Legend Series tradition that Harvia has maintained since the company's founding in 1950. The 165-lb stove ships by scheduled pallet freight. A licensed chimney professional is recommended for flue installation. We are an authorized Harvia dealer.
About Harvia
Handcrafted in Finland - Legend Series - CE Certified
Harvia Legend 240 SL. 21kW. 353-848 cu ft. Exterior feed. Cast-iron glass door. 440 lbs stones.
Harvia is a Finnish sauna and spa company established in 1950. The Legend 240 SL is Harvia's 21kW exterior-feed wood-burning sauna stove for large rooms from 353 to 848 cubic feet - handcrafted by Harvia master blacksmiths, with a cast-iron glass door, two-stage combustion air grate, reversible door direction, and 440-lb stone capacity. 440 lbs of AC3020 stones (10 boxes) and a 6" North American flue adapter are required and sold separately. Pallet delivery - scheduled freight appointment required. We are an authorized Harvia dealer.
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21kW wood-burning - 353-848 cu ft - no electricity required
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SL exterior feed - wood loaded from outside the sauna room
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Cast-iron glass door - reversible direction - fire visible from inside
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440 lbs AC3020 stones (10 boxes) required - sold separately
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Pallet delivery - 165 lbs - 6" North American flue adapter required - sold separately
Legend 240 SL vs Legend 150 vs M3 - selecting the right stove
Legend 240 SL vs Legend 150 vs M3 - choosing the correct Harvia wood stove
Three Harvia wood-burning stoves available at BathingBrands cover distinct room ranges and installation types. M3 WKM3: 16.5kW, 212-459 cu ft, 66 lbs stones (2 boxes), compact 15.4"W, interior feed, UPS Ground. Legend 150 WK150LD: 16kW, 212-459 cu ft, 264 lbs stones (6 boxes), 21"W, interior feed, larger stone mass, cast-iron glass door, pallet delivery. Legend 240 SL WKLE20SLM (this listing): 21kW, 353-848 cu ft, 440 lbs stones (10 boxes), exterior feed through wall, reversible cast-iron glass door, pallet delivery. For rooms under 459 cu ft with an interior load preference: choose M3 (compact) or Legend 150 (maximum stone mass). For rooms from 353-848 cu ft requiring exterior loading: Legend 240 SL is the only option in this range. For rooms in the 353-459 cu ft overlap zone, all three are technically rated - the stone load, footprint, and feed direction determine the best fit.
Manuals and Documents
Warranty
2-year limited warranty (consumer use)
The Harvia Legend 240 SL is covered by Harvia's 2-year limited warranty from the date of purchase for consumer use. The warranty covers defects in manufacturing and materials under normal use conditions. The warranty does not cover damage caused by improper installation, use of incorrect stone type or size, operating without the required stone load, failure to follow the installation and operating guidelines in the manual, damage from inadequate chimney maintenance, or damage from soot fires. A licensed or certified chimney professional is recommended for all flue installation and regular chimney sweep maintenance. Proof of purchase from an authorized Harvia dealer is required for warranty claims. We are an authorized Harvia dealer.
