Harvia Legend 150 SL Legend Series 16.0kW Wood Sauna Stove w/Ext. Feed
The Harvia Legend 150 SL is a 16kW wood-burning sauna stove for rooms from 212 to 459 cubic feet, built around the SL exterior-feed configuration of the Legend platform. The fire chamber extends through the sauna wall so wood is loaded from an adjacent room or outdoors - the cast-iron glass door faces outward, creating a live fireplace view for the person in the adjacent room while bathers inside the sauna enjoy the full 16kW heat output and the soft, humid steam from 264 lbs of AC3020 stones. Harvia describes this as a comfortably moist sauna bath - the large stone mass relative to the room size produces gentle, deeply humid steam that is characteristic of smaller Legend installations. The reversible door direction is set during installation to suit the room layout. The split-air grate structure directs part of the combustion air to the upper fire chamber for cleaner, more efficient burning. Adjustable legs simplify levelling. Flue: 115mm (4.5") European standard - a 6" North American adapter is required and sold separately. 264 lbs AC3020 stones (6 boxes, 10-15 cm) required and sold separately. Pallet delivery - scheduled freight appointment required. CE and EAC certified. Made in Finland by Harvia.
SL exterior feed - sauna heat inside, fireplace view outside
The Legend 150 SL's defining feature is the through-wall fire chamber that separates the experience of the sauna from the experience of managing the fire. The firebox and cast-iron glass door face the adjacent room - a lounge, relaxation space, or exterior area. Wood is loaded from outside the sauna at all times. The fire is visible and tended from outside. Inside the sauna, bathers receive 16kW of radiant wood heat and the steam from 264 lbs of stones without the sauna door ever opening for firewood. Harvia's own description is direct: the Legend 150 SL is the right choice for people who want to conveniently heat their sauna from another room or outside the building. For a cabin sauna with an adjoining relaxation room, a sauna building where the fire must be loaded from outdoors, or any layout where exterior wood loading is the preferred operational mode, the 150 SL is purpose-built for the task.
264 lbs of stones for a 212-459 cu ft room - comfortably humid steam
The Legend 150 SL carries 264 lbs (120 kg) of AC3020 stones for a room range of 212 to 459 cu ft. The ratio of stone mass to room volume is deliberately generous - the large stone load relative to the smaller room size produces the comfortably moist steam quality that Harvia specifically attributes to this model. The stones accumulate heat throughout the fire and hold it long after the fire dies down. The open structure of the stone compartment allows water to be thrown on the entire outer surface of the stone bed, not just a single point - the steam is distributed across the full stone mass and rises evenly into the sauna room. The heat retained in the large stone load allows water to be added at lower temperatures, sustaining humid steam without the fire needing to be at full intensity.
Split-air grate, compact clearances, and reversible cast-iron glass door
The Legend 150 SL fire chamber uses a split-air combustion grate that routes part of the air supply to the upper fire chamber for more complete combustion, reduced creosote output, and a longer fire chamber lifespan. Safety clearances to combustible materials are modest for a 16kW stove: 7.87" at both sides, 9.84" at the back, 19.69" at the front. To non-combustible materials, the side and back clearances reduce to 3.94". The reversible cast-iron glass door is set to open left or right during installation with no need to order a handed configuration at purchase. Adjustable legs allow the stove to be levelled on any floor condition. A licensed or certified chimney professional is recommended for all flue installations and for correct preparation of the wall penetration for the SL fire chamber extension.
16kW wood-burning sauna stove for rooms from 212 to 459 cubic feet. SL exterior feed - fire chamber extends through sauna wall, wood loaded from adjacent room or outdoors. Cast-iron glass door faces outward - fireplace view from adjacent room while sauna bathers enjoy heat inside. Reversible door direction. No electricity required. Black steel frame - 264 lbs AC3020 stones required (6 boxes, 10-15 cm, sold separately). Split-air grate for cleaner, efficient combustion. Safety distances: front 19.69", sides 7.87", back 9.84" (combustible). Top or rear flue connection. 115mm flue - 6" adapter required for North America (sold separately). Dimensions: 21"W x 28.7"D x 29.1"H. Optional: WL200 protective sheath, WL300 smoke pipe guard, WP250LD pipe-mounted water heater. Pallet delivery - scheduled freight required. 2-year warranty (consumer). CE and EAC certified. Made in Finland by Harvia.
16 kW 212 to 459 cu ft SL - exterior feed through sauna wall Wood loaded from adjacent room or outdoors Cast-iron glass door faces outward - fireplace view Reversible door direction Wood-burning - no electricity required Black steel frame - large stone mass 264 lbs AC3020 stones required (6 boxes, 10-15 cm) Split-air grate - cleaner, efficient combustion Safety: front 19.69", sides 7.87", back 9.84" Top or rear flue connection 115mm flue - 6" adapter required for North America 21"W x 28.7"D x 29.1"H Adjustable legs WL200 protective sheath compatible Pallet delivery required 2-year warranty (consumer) CE and EAC certified - made in Finland
⚠️ 264 lbs AC3020 stones (6 boxes, 10-15 cm) required - not included. 6" North American flue adapter required - not included. Pallet delivery. Stones and the 6" adapter must be purchased separately. An additional box of stones is recommended for selection of best-fitting stones. This stove ships by scheduled pallet freight - a delivery appointment is required. At 143.5 lbs net weight, plan for on-site assistance to move the stove from the delivery point to its installation position. A licensed chimney professional is recommended for all flue installations. The wall penetration for the SL fire chamber extension must be correctly prepared per the installation manual before delivery.
ℹ️ Legend 150 SL WK150LDSL vs Legend 150 WK150LD - SL exterior feed vs standard interior feed, same platform. Legend 150 WK150LD: interior feed - firebox door faces into the sauna room, wood loaded from inside the sauna, cast-iron glass door provides fire view for bathers. Legend 150 SL WK150LDSL (this listing): exterior feed - fire chamber extends through the sauna wall, wood loaded from an adjacent room or outdoors, cast-iron glass door faces the adjacent room for a live fireplace view, bathers in the sauna are completely undisturbed. Both share identical output (16kW), room range (212-459 cu ft), stone requirement (264 lbs, 6 boxes AC3020), and Legend platform. Choose the Legend 150 for interior-feed simplicity. Choose the Legend 150 SL for exterior wood loading and the dual-room fireplace experience.
Specifications
Performance
| Power output |
16 kW |
| Fuel type |
Wood - no electricity required |
| Room volume |
212 to 459 cu ft (6-13 m3) |
| Stone capacity |
264 lbs / 120 kg (6 boxes AC3020, 10-15 cm) - sold separately |
| Stone size |
O 10-15 cm (AC3020) |
SL exterior feed
| Firebox access |
From outside the sauna room via wall extension |
| Glass door faces |
Adjacent room - fireplace view from outside sauna |
| Door direction |
Reversible - set during installation |
| Dual-room effect |
Sauna heat inside + fireplace view outside simultaneously |
Safety distances (combustible materials)
| Front |
19.69 in (500 mm) |
| Sides (left and right) |
7.87 in (200 mm) |
| Back |
9.84 in (250 mm) |
| Ceiling clearance |
3.28 ft (1,000 mm) above heater top |
| Side / back (non-combustible) |
3.94 in (100 mm) |
| Minimum room ceiling height |
6.56 ft (2,000 mm) |
Physical dimensions
| Width |
21 in (530 mm) |
| Depth |
28.7 in (730 mm) - extended for SL wall penetration |
| Height |
29.1 in (740 mm) |
| Net weight (stove only) |
143.5 lbs (65.1 kg) |
| Gross weight (packaged) |
150.4 lbs (68.2 kg) |
| Package width |
29.3 in (745 mm) |
| Package depth |
21.7 in (550 mm) |
| Package height |
30.1 in (765 mm) |
Flue and installation
| Flue connection diameter |
115mm (4.5") - standard European |
| Flue connection position |
Top or rear - selected during installation |
| North American adapter |
6" (155mm) adapter required - sold separately |
| Legs |
Adjustable |
| Delivery |
Scheduled pallet freight - appointment required |
Certifications and compliance
| Certifications |
CE / EAC certified |
| Origin |
Made in Finland by Harvia |
| Warranty |
2-year limited (consumer use) |
Optional accessories (sold separately)
| North American flue adapter |
Harvia WZ115155 (6" / 155mm) |
| Protective sheath |
Harvia WL200 (reduces side and back clearances) |
| Smoke pipe guard |
Harvia WL300 (stone-filled pipe guard) |
| Protective floor bedding |
Harvia WL100 (aluminium-zinc coated steel) |
| Pipe-mounted water heater |
WP250LD (chimney-mounted, 25L, with bench tap) |
What's included
Harvia Legend 150 SL wood-burning sauna stove with exterior feed SL fire chamber
Cast-iron framed glass door (reversible direction)
Grill
Adjustable legs
Installation and operating instructions
2-year limited warranty (consumer use)
Required (not included): 264 lbs AC3020 stones - 6 boxes, 10-15 cm (additional box recommended); 6" North American flue adapter (Harvia WZ115155). Optional accessories (sold separately): WL200 protective sheath; WL300 smoke pipe guard; WL100 floor bedding; WP250LD pipe-mounted water heater. A licensed chimney professional is recommended for all flue installations. Wall penetration preparation required per installation manual.
Why the Harvia Legend 150 SL stands out
Sauna and fireplace - one fire, two rooms
The Legend 150 SL's through-wall fire chamber delivers two simultaneous experiences from a single fire. Inside the sauna: 16kW of radiant wood heat, soft and humid steam from 264 lbs of stones, and the atmosphere of a traditional Finnish wood-fired sauna. In the adjacent room: the cast-iron glass door provides a direct live view of the burning fire, with the warmth and ambience of a working fireplace. Both experiences run simultaneously from a single fire tended from one side - outside the sauna - without any interaction with the sauna interior. For a cabin sauna with a lounge, a sauna building where the fire is loaded from outdoors, or any layout with two rooms sharing a wall, the 150 SL delivers both without compromise.
Comfortably moist steam - 264 lbs of stones for a smaller sauna
Harvia specifically describes the Legend 150 SL as delivering comfortably moist steam for smaller saunas - a deliberate reference to the ratio of stone mass (264 lbs) to room size (212-459 cu ft). The generous stone load relative to the room produces deeply humid steam that is characteristic of smaller, more intimate sauna bathing. The open stone compartment structure allows water to be thrown on the full outer surface of the stone bed, distributing steam evenly across the room rather than from a single pour point. The heat stored in the large stone mass allows water to be added even at lower temperatures, sustaining soft steam throughout the session without the fire needing to be at peak output.
Undisturbed sessions - wood loaded from outside
Wood loading, fire adjustment, and firebox access all happen from outside the sauna room. The sauna door never needs to open for firewood - heat is retained, the session is uninterrupted, and the bathing atmosphere inside the sauna remains completely undisturbed. In a cabin sauna with an adjoining lounge, one person can tend the fire from the lounge while bathers inside are in full session. The reversible door direction is set at installation - left or right swing is decided based on room layout, not at purchase. Adjustable legs allow the stove to be levelled precisely on any floor surface during installation.
Split-air grate - cleaner burn, longer stove life
The Legend 150 SL fire chamber uses Harvia's split-air combustion grate, which routes a portion of the combustion air supply to the upper fire chamber above the primary burn zone. Secondary air supports more complete combustion of gases, reducing smoke output and creosote buildup in the flue. The cleaner burn means lower chimney maintenance frequency and better air quality from the flue output. Harvia credits the split-air grate design with directly extending the fire chamber's operational lifespan - a meaningful benefit for a stove that is expected to serve for decades of seasonal or year-round use.
Compact safety clearances for flexible bench placement
The Legend 150 SL's safety clearances to combustible materials are modest for a 16kW stove: 7.87" at both sides and 9.84" at the back. These smaller than usual distances from side and back surfaces are specifically noted by Harvia as enabling more flexible bench placement within the sauna room. To non-combustible materials the clearances reduce further to 3.94" at both sides and back. The optional WL200 protective sheath (sold separately) can be fitted to reduce clearances even further when required by the specific room layout. For a small sauna room in the 212-459 cu ft range, this clearance flexibility directly impacts how much usable bench area can be positioned relative to the stove.
Legend Series platform - 150 SL and related configurations
The WK150LDSL is the exterior-feed SL variant of Harvia's Legend 150 platform. The same 16kW platform is also available as: standard interior feed (Legend 150, WK150LD) for installations where exterior wood loading is not required. The Legend 150 SL is compatible with the WL200 protective sheath, WL300 smoke pipe guard, WL100 floor bedding, and the WP250LD pipe-mounted chimney water heater. For larger rooms at 16kW with more stone mass, the Legend 300 platform (23.5kW, 494-989 cu ft, 573 lbs of stones) is the step up. Described by Harvia as a handmade masterpiece by their master blacksmiths. Made in Finland. We are an authorized Harvia dealer.
About Harvia
Made in Finland - CE Certified - Legend Series SL
Harvia Legend 150 SL. 16kW. 212-459 cu ft. SL exterior feed. Fireplace view in adjacent room.
Harvia is a Finnish sauna and spa company established in 1950. The Legend 150 SL is the exterior-feed SL variant of Harvia's 16kW Legend Series - a through-wall fire chamber that lets one person load wood and watch the fire from an adjacent room while another enjoys the sauna inside. The cast-iron glass door provides a live fireplace view outside while the stone mass inside delivers comfortably humid steam. 264 lbs of AC3020 stones (6 boxes) and a 6" North American flue adapter are required and sold separately. Pallet delivery. We are an authorized Harvia dealer.
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16kW wood-burning - 212-459 cu ft - no electricity required
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SL exterior feed - wood from adjacent room - fireplace view outside sauna
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Cast-iron glass door - reversible direction - 264 lb stone mass
- Safety distances: front 19.69", sides 7.87", back 9.84"
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264 lbs AC3020 stones (6 boxes) required - 6" adapter required - both sold separately
Legend 150 SL vs Legend 150 vs Legend 300 SL - Legend Series comparison
Legend 150 SL vs Legend 150 vs Legend 300 - selecting the right Legend configuration
Three Legend configurations are most relevant for buyers considering the Legend 150 SL. Legend 150 WK150LD: same 16kW platform, interior feed - firebox door faces into the sauna room, wood loaded from inside. Choose if exterior wood loading is not required and a simpler installation is preferred. Legend 150 SL WK150LDSL (this listing): 16kW, 212-459 cu ft, exterior feed, cast-iron glass door faces adjacent room for fireplace view, 264 lbs stones (6 boxes AC3020), 7.87" side clearances. The right choice for smaller sauna rooms (212-459 cu ft) where exterior wood loading and the dual-room fireplace experience are the design goal. Legend 300 WK150LDSL: 23.5kW, 494-989 cu ft, interior feed, 573 lbs stones (13 boxes AC3020). Choose the Legend 300 when the room is larger than 459 cu ft, more output is needed, or a larger stone mass for sustained heat after the fire is the priority. For the 212-459 cu ft range with exterior feed and the comfortably moist steam quality of the 150 platform, the Legend 150 SL is the purpose-built specification.
Manuals and Documents
Warranty
2-year limited warranty (consumer use)
The Harvia Legend 150 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 (non-AC3020, or stones outside the 10-15 cm specified diameter range), operating without the required stone load, failure to follow the installation and operating guidelines in the manual, damage from inadequate chimney maintenance, soot fires, or improper wall penetration preparation for the SL fire chamber extension. 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.
