Harvia Linear 22 GreenFlame Linear Series, 15.7 kW Wood Sauna Stove
The Harvia Linear 22 GreenFlame is a 15.7kW floor-mounted wood-burning sauna stove for rooms from 318 to 636 cubic feet, built around Harvia's GreenFlame fire chamber - an updated combustion system designed for clean, controlled burning. Compared to standard wood-burning stoves of the same output class, the GreenFlame fire chamber reduces particulate emissions by 20% and carbon monoxide emissions by 70%, making it one of the most environmentally responsible wood-burning sauna stoves in the Harvia lineup. The matte black body with a 90% larger glass door than the standard Linear creates an expansive view of the fire inside the sauna - Harvia describes the atmosphere as wonderful, with the fire highlighted beautifully through the large glass. The replaceable internal components (flame guide panels at sides and back) are designed to be swapped out at the end of their service life, extending the stove's operational lifespan. 88.2 lbs of AC3020 stones (2 boxes, 10-15 cm) are required and sold separately. Flue: 115mm (4.5") European standard - a 6" North American adapter is required and sold separately. Pallet delivery - scheduled freight required. CE and EAC certified. Made in Finland by Harvia.
GreenFlame technology - 20% lower particles, 70% lower carbon monoxide
Harvia's GreenFlame fire chamber is described as pioneering quality in sauna heater technology - a complete redesign of the combustion system inside the stove, not a filter or aftertreatment. The fire chamber is engineered for the perfect flow of air and retention of heat, producing a burn that is measurably cleaner than conventional sauna stove fire chambers. The 20% reduction in particulate emissions and 70% reduction in carbon monoxide are measured against a conventional Harvia stove of the same output class - not against a general average. Harvia connects the GreenFlame development directly to a long-term company goal of cutting small particle emissions from wood-burning stoves in half. Controlled combustion also has practical benefits beyond emissions: the GreenFlame fire burns more completely, producing less soot on the glass door (maintaining the fire view throughout the session), generating less creosote in the flue (reducing chimney maintenance frequency), and creating a more stable, predictable burn throughout the session.
90% larger glass door - the fire as a feature of the sauna room
The Linear 22 GreenFlame's glass door is 90% larger than the standard Linear design. This is not an incremental change - it fundamentally alters the visual experience inside the sauna room. The fire becomes a focal point rather than a background detail: visible, warm, and central to the sauna atmosphere from anywhere in the room. The clean-burning GreenFlame fire chamber also keeps the glass cleaner through the session, since more complete combustion produces less soot that would otherwise deposit on the glass. The matte black body and elegant Linear design frame the large glass door in a way that Harvia describes as creating a modern look in the sauna. Harvia's own commercial partners have highlighted the large door specifically as a primary reason for choosing the Linear 22 GreenFlame - quoting that the larger door creates an inviting glow from the heater that enhances the sauna experience.
Replaceable internals, linear protective walls, and adjustable legs
The Linear 22 GreenFlame is built for a long operational lifespan. The flame guide panels at the sides and back of the fire chamber - the components most exposed to combustion heat - are designed to be individually replaced when they reach the end of their service life, without replacing the entire stove body. The external Linear protective walls can be installed to reduce safety clearances in installations where the standard distances constrain bench placement or room layout. Adjustable frame legs facilitate levelling on any floor surface and ensure stability during operation. Top and back flue connection options accommodate different chimney routing requirements. The WL585 protective sheath (sold separately) is the model-specific accessory for the Linear GreenFlame and includes knock-out holes for optional water spout integration.
15.7kW wood-burning sauna stove for rooms from 318 to 636 cubic feet. Linear Series with GreenFlame technology: 20% lower particulate emissions and 70% lower carbon monoxide emissions vs standard models. 90% larger glass door than standard Linear - clean fire view throughout the session. Matte black. Replaceable internals (flame guide panels) for extended service life. Linear protective walls for flexible installation. Adjustable frame legs. No electricity required. 88.2 lbs AC3020 stones required (2 boxes, 10-15 cm, sold separately). Safety distances: front 19.69", sides 15.75", back 14.96" (combustible). Ceiling clearance 4.15 ft. Top or back flue connection. 115mm flue - 6" adapter required for North America (sold separately). Dimensions: 17.72"W x 20.08"D x 30.31"H. Optional: WL585 protective sheath. Pallet delivery - scheduled freight required. 2-year warranty (consumer). CE and EAC certified. Made in Finland by Harvia.
15.7 kW 318 to 636 cu ft GreenFlame technology - clean-burn fire chamber 20% lower particulate emissions vs standard 70% lower carbon monoxide vs standard 90% larger glass door than standard Linear Matte black - modern Linear design Replaceable internals - extended service life Linear protective walls for flexible installation Adjustable frame legs Wood-burning - no electricity required 88.2 lbs AC3020 stones required (2 boxes, 10-15 cm) Safety: front 19.69", sides 15.75", back 14.96" Top or back flue connection 115mm flue - 6" adapter required for North America 17.72"W x 20.08"D x 30.31"H WL585 protective sheath compatible Pallet delivery required 2-year warranty (consumer) CE and EAC certified - made in Finland
⚠️ 88.2 lbs AC3020 stones (2 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 145.5 lbs net weight, plan for on-site assistance to move the stove from the pallet delivery point to its installation position. A licensed chimney professional is recommended for all flue installations.
ℹ️ Linear 22 GreenFlame vs Linear 22 GreenFlame LS / RS / ES - standard vs water tank configurations. Linear 22 GreenFlame WKLI20GM (this listing): standard configuration - no integrated water tank, interior-feed firebox, wood loaded from inside the sauna. Linear 22 GreenFlame LS WKLI22GLSM: same 15.7kW GreenFlame stove with 30-litre left-side water tank. Linear 22 GreenFlame RS WKLI20GRSM: 30-litre right-side water tank. Linear 22 GreenFlame ES WKLI20GESM: 20-litre front water tank. All four share identical output (15.7kW), room range (318-636 cu ft), GreenFlame fire chamber, 88.2-lb stone requirement, and Linear platform. Choose the standard WKLI20GM when no integrated hot water tank is needed. Choose the LS, RS, or ES variants for installations where simultaneous sauna heating and water heating from a single stove is the goal.
Specifications
Performance
| Power output |
15.7 kW |
| Fuel type |
Wood - no electricity required |
| Room volume |
318 to 636 cu ft |
| Stone capacity |
88.2 lbs / 40 kg (2 boxes AC3020, 10-15 cm) - sold separately |
| Stone size |
O 10-15 cm (AC3020) |
GreenFlame vs standard models
| Particulate emissions |
20% lower than a standard heater of the same output |
| Carbon monoxide (CO) emissions |
70% lower than a standard heater of the same output |
| Glass door size |
90% larger than standard Linear glass door |
| Combustion control |
GreenFlame fire chamber - optimised airflow for clean burn |
| Soot on glass |
Minimal - clean burn reduces glass soot deposit |
Safety distances (combustible materials)
| Front |
19.69 in (500 mm) |
| Sides (left and right) |
15.75 in (400 mm) |
| Back |
14.96 in (380 mm) |
| Ceiling clearance |
4.15 ft (1,265 mm) above stove top |
| Side / back (non-combustible) |
3.94 in (100 mm) |
| Front (non-combustible) |
19.69 in (500 mm) |
| Minimum room ceiling height |
6.56 ft (2,000 mm) |
Physical dimensions
| Width |
17.72 in (450 mm) |
| Depth |
20.08 in (510 mm) |
| Height |
30.31 in (770 mm) |
| Net weight (stove only) |
145.5 lbs (66.0 kg) |
| Gross weight (packaged) |
152.1 lbs (69.0 kg) |
| Package height |
30.91 in |
| Package width |
20.28 in |
| Package depth |
18.11 in |
Construction and finish
| Body material |
Steel |
| Color |
Matte black |
| Glass door |
Large - 90% larger than standard Linear |
| Replaceable internals |
Flame guide panels (sides and back) |
| Protective walls |
Linear protective walls included |
| Legs |
Adjustable frame legs |
| Installation |
Floor-mounted, vertical orientation |
Flue and certifications
| Flue connection diameter |
115mm (4.5") - standard European |
| Flue connection position |
Top or back - selected during installation |
| North American adapter |
6" (155mm) adapter required - sold separately |
| Certifications |
CE / EAC certified |
| Origin |
Made in Finland by Harvia |
| Warranty |
2-year limited (consumer use) |
| Delivery |
Scheduled pallet freight - appointment required |
Optional accessories (sold separately)
| North American flue adapter |
Harvia WZ115155 (6" / 155mm) |
| Protective sheath |
Harvia WL585 (Linear GreenFlame specific - water spout knock-out) |
| Floor bedding |
Harvia WL100 (aluminium-zinc coated steel, black) |
| Pipe-model water heater |
Compatible - chimney-mounted (sold separately) |
| Chimney kit |
Harvia WHP1500 / WHP1500M (stainless steel) |
What's included
Harvia Linear 22 GreenFlame 15.7kW wood-burning sauna stove
Large glass door
Fastening kit
Linear protective walls
Adjustable frame legs
Installation and operating instructions
2-year limited warranty (consumer use)
Required (not included): 88.2 lbs AC3020 stones - 2 boxes, 10-15 cm (additional box recommended); 6" North American flue adapter (Harvia WZ115155). Optional accessories (sold separately): WL585 protective sheath (Linear GreenFlame specific); WL100 floor bedding; pipe-model chimney water heater; Harvia WHP1500 / WHP1500M chimney kit. A licensed chimney professional is recommended for all flue installations.
Why the Harvia Linear 22 GreenFlame stands out
GreenFlame fire chamber - 20% lower particles, 70% lower CO
The GreenFlame fire chamber is not a filter added to an existing design - it is a completely redesigned combustion system built from the ground up for clean burning. Harvia engineered the airflow pattern and heat retention characteristics of the fire chamber specifically to achieve complete combustion of wood gases and particles before they leave the fire chamber. The results are measured: 20% lower particulate emissions and 70% lower carbon monoxide output compared to a conventional Harvia stove of the same 15.7kW output class. This is part of Harvia's long-term development commitment to cutting small particle emissions from wood-burning heaters in half. Controlled combustion also means less soot on the glass, less creosote in the flue, and a more stable burn throughout the session.
90% larger glass door - the fire as a sauna feature
The glass door on the Linear 22 GreenFlame is 90% larger than the door on the standard Linear design. This fundamentally alters the visual experience inside the sauna room. The fire becomes a focal point rather than a background detail - visible, warm, and central to the atmosphere from anywhere in the room. The clean-burning GreenFlame fire chamber also keeps soot off the glass during the session, maintaining a clear fire view throughout rather than clouding over as the session progresses. Harvia commercial partners have highlighted the large door specifically: the inviting glow from the heater enhances the sauna experience - a quality that only a wood fire behind a large glass can produce.
Replaceable flame guide panels - decades of service
The flame guide panels at the sides and back of the fire chamber are the components most exposed to combustion heat. Harvia designed them as individually replaceable parts - when a panel reaches the end of its service life, it can be swapped out without replacing the entire stove body. This serviceability extends the effective operational lifespan well beyond what would be possible if the fire chamber were a single non-serviceable unit. For a stove at this investment level expected to serve a sauna for decades, designed-in replaceability is a meaningful long-term ownership advantage. Spare parts are available through Harvia's authorized dealer network.
Linear protective walls - flexible installation
The Linear 22 GreenFlame includes Linear protective walls that can be installed around the stove body to reduce the safety clearances to combustible materials. Without the walls, clearances are 19.69" at the front, 15.75" at the sides, and 14.96" at the back. With the protective walls installed, the side and back clearances reduce to the non-combustible material distances of 3.94". For a sauna room in the 318-636 cu ft range where bench placement relative to the stove is important, the protective walls directly expand the usable bench area available. The WL585 model-specific protective sheath (sold separately) provides further clearance reduction and includes knock-out holes for optional water spout routing.
15.7kW for 318-636 cu ft - even heat, efficient air circulation
At 15.7kW for rooms from 318 to 636 cu ft, the Linear 22 GreenFlame covers the full medium home sauna range. Harvia notes that the stones heat the entire sauna quickly, offering enough heat for even the most demanding sauna bathers. The GreenFlame fire burns cleanly and stably, producing reliable heat output through the session. The 88.2-lb stone load accumulates thermal energy during the fire and releases soft, consistent steam when water is thrown. Water heater integration is available through the LS, RS, and ES variants if simultaneous sauna and water heating is needed alongside the standard configuration.
Linear Series platform - GreenFlame and related models
The WKLI20GM is the standard (no water tank) configuration of the Linear 22 GreenFlame platform. The same 15.7kW GreenFlame platform is available with 30-litre left-side tank (LS, WKLI22GLSM), 30-litre right-side tank (RS, WKLI20GRSM), and 20-litre front tank (ES, WKLI20GESM). The Linear Series also includes the standard (non-GreenFlame) Linear 16 for buyers where the GreenFlame emissions technology is not required. All Linear stoves are designed for heat-insulated Harvia WHP chimney pipes and are CE and EAC certified. Made in Finland by Harvia. We are an authorized Harvia dealer.
About Harvia
Made in Finland - CE Certified - Linear Series - GreenFlame Technology
Harvia Linear 22 GreenFlame. 15.7kW. 318-636 cu ft. 20% lower particles. 70% lower CO. 90% larger glass door.
Harvia is a Finnish sauna and spa company established in 1950. The Linear 22 GreenFlame is Harvia's clean-burn wood-burning stove for medium saunas - a fully redesigned GreenFlame fire chamber delivering 20% lower particulate emissions and 70% lower carbon monoxide, a 90% larger glass door, replaceable flame guide panels for extended service life, and the matte black Linear design. 88.2 lbs AC3020 stones (2 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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15.7kW wood-burning - 318-636 cu ft - GreenFlame clean-burn fire chamber
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20% lower particulate emissions - 70% lower CO vs standard models
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90% larger glass door - matte black - replaceable flame guide panels
- Safety distances: front 19.69", sides 15.75", back 14.96"
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88.2 lbs AC3020 stones (2 boxes) required - 6" adapter required - both sold separately
Linear 22 GreenFlame vs PRO 20 vs Legend 150 SL - medium sauna stove comparison
Linear 22 GreenFlame vs PRO 20 vs Legend 150 SL - choosing the right stove for 318-636 cu ft
Three stoves serve the 318-636 cu ft medium sauna range. PRO 20 WKPR20M: 24.1kW, 283-706 cu ft, graphite black with stainless steel front, cast-iron glass hatch, 88 lbs stones (2 boxes AC3020), safety clearances 4" sides / 4" back / 12" front. Higher output, tighter clearances. Right choice for vigorous high-output sauna bathing where maximum heat intensity is the priority. Linear 22 GreenFlame WKLI20GM (this listing): 15.7kW, 318-636 cu ft, GreenFlame clean-burn fire chamber, 90% larger glass door, 88.2 lbs stones (2 boxes AC3020), clearances 15.75" sides / 14.96" back / 19.69" front (reduces with protective walls). Right choice when lower emissions, the large glass door aesthetic, and the replaceable-internals serviceability of the Linear platform are the priority. Legend 150 SL WK150LDSL: 16kW, 212-459 cu ft, exterior feed through wall, 264 lbs stones (6 boxes AC3020), fireplace view in adjacent room. Right choice for exterior wood loading and the dual-room fireplace experience in the smaller 212-459 cu ft range. Choose the Linear 22 GreenFlame for the 318-636 cu ft range where GreenFlame clean-burn technology, the large glass door, and Linear Series design are the right specification.
Manuals and Documents
Warranty
2-year limited warranty (consumer use)
The Harvia Linear 22 GreenFlame 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, or 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.
