The Cozy Heat OG Sauna Stove Package is a complete wood-burning sauna stove package in the OG series - the Cozy OG stove and sauna stones, available in 12kW (210-423 cu ft) and 18kW (317-635 cu ft) with stone style selected at checkout. The Cozy OG is the contemporary trilateral variant - it shares the three-sided body form of the base Cozy but refines it with clean lines and graceful curves that give the stove a more polished, contemporary visual character. Where the base Cozy's trilateral form is functional and direct, the OG's curves soften the transitions between the three faces, producing a stove body that is simultaneously architectural and organic. Every technical specification - the 5mm stainless flame cutter, three-stage combustion, 25-40% firewood reduction, and German EN 15821:2010 certification - is identical across all Cozy Heat models. The OG is for buyers who want the three-sided Cozy form with a more refined, curved execution.
Contemporary trilateral design - clean lines and graceful curves
The Cozy OG body features the same innovative trilateral (three-sided) geometry as the base Cozy, but with a contemporary execution: the edges and transitions between the three faces are characterised by graceful curves that soften the stove's silhouette without abandoning the clean-lined, architectural quality of the trilateral form. Cozy Heat describes this as "clean lines and graceful curves" - a design language that sits between the base Cozy's more utilitarian angularity and the Cozy O's fully circular rim. The OG reads as the most refined version of the trilateral form in the Cozy range - appropriate for sauna interiors where the stove is intended to be a design feature in its own right, not simply a functional heating appliance placed against a wall. For buyers who have viewed both the base Cozy and the Cozy O and prefer a three-sided form with more considered design detailing, the OG is the appropriate choice.
Same proven Cozy Heat engineering in every model
The OG shares every technical specification with the base Cozy PKG and the Cozy O PKG. The flame cutter is 5mm stainless steel - the most thermally stressed part of the stove, built to resist the warping that thinner steel develops under years of sustained heat cycling. The combustion system is three-stage: primary air through the fireplace grate, secondary air through mid-chamber channels, and tertiary air through ceiling pipes that burn the flue gases themselves as a final combustion stage. The result is 25-40% less firewood than comparable stoves, up to 6x cleaner smoke gases, and 73.9% thermal efficiency at 12kW and 81.3% at 18kW. The German BlmSchV DIN EN 13240 Level 2 and EN 15821:2010 certification confirm all these figures against Europe's most demanding standard for wood-burning appliances. A chimney installation is required and is sold separately.
12kW or 18kW with the correct stone load included
The 12kW Cozy OG covers rooms from 210 to 423 cubic feet with a minimum stone load of 265 lbs included at checkout. The 18kW covers 317 to 635 cubic feet with a minimum of 353 lbs. The overlap between 317 and 423 cubic feet gives buyers in this range a choice: 12kW for well-insulated wood-walled rooms where faster heat-up and lower wood consumption are priorities; 18kW for rooms with glass, tile, or masonry cold surfaces that require more output to compensate for increased heat absorption. Each natural stone is unique in shape and size - purchasing an additional box of stones allows selection of the best-fitting pieces for the stone cavity of the OG's particular geometry.
Wood-burning sauna stove package with contemporary trilateral design - clean lines and graceful curves - available in 12kW (210-423 cu ft) and 18kW (317-635 cu ft), select at checkout. Includes Cozy OG stove and sauna stones (stone style selected at checkout). Three-sided body with refined curved transitions - the most design-forward trilateral in the Cozy range. 5mm stainless steel flame cutter. Three-stage combustion - 25-40% less firewood. Glass door for fire viewing. Top flue outlet. EN 15821:2010 and German BlmSchV DIN EN 13240 Level 2 certified. 12kW: 73.9% efficiency. 18kW: 81.3% efficiency. No electrical connection required. Chimney required - sold separately. Floor-standing. Handmade in Estonia. 2-year warranty.
Package - stove + stones included 12kW (210-423 cu ft) or 18kW (317-635 cu ft) Contemporary trilateral design - clean lines, graceful curves Wood-burning - no electrical required Three-stage combustion 25-40% less firewood than comparable stoves 5mm stainless steel flame cutter Glass door for fire viewing EN 15821:2010 certified German BlmSchV DIN EN 13240 Level 2 12kW: 73.9% efficiency | 18kW: 81.3% efficiency Chimney required - sold separately Handmade in Estonia 2-year warranty
Specifications
Output selection - choose at checkout
| 12kW |
210 to 423 cu ft | Min 265 lbs stones | 73.9% efficiency |
| 18kW |
317 to 635 cu ft | Min 353 lbs stones | 81.3% efficiency |
| Electrical required |
None |
| Chimney required |
Yes - sold separately |
| Stone style |
Selected at checkout |
Design and combustion
| Distinguishing design feature |
Contemporary trilateral body - clean lines with graceful curves |
| Combustion stages |
Three-stage: primary (grate), secondary (mid-chamber), tertiary (ceiling pipes) |
| Firewood reduction |
25-40% less than comparable stoves |
| Flue gas reduction |
Up to 6x cleaner smoke gases |
| Certification |
EN 15821:2010 | BlmSchV DIN EN 13240 Level 2 |
Firebox opening dimensions
| 12kW minimum opening width |
10.0" (255 mm) |
| 12kW minimum floor height |
17.3" (440 mm) |
| 18kW minimum opening width |
12.4" (315 mm) |
| 18kW minimum floor height |
18.5" (470 mm) |
Construction
| Distinguishing feature |
Contemporary trilateral design - clean lines and graceful curves |
| Flame cutter material |
5mm stainless steel |
| Body construction |
Steel |
| Door |
Glass viewing door |
| Flue outlet position |
Top of stove |
| Mounting |
Floor-standing |
| Origin |
Handmade in Estonia |
Installation requirements
| Chimney |
Required - sold separately |
| Flue connection |
Must be made by a qualified specialist |
| Shared flue system |
Not suitable |
| Firewood |
Dry seasoned hardwood required |
Warranty
| Warranty period |
2 years |
| Overfiring |
Not covered - do not overload or leave controls fully open |
| Chimney sweeping |
Required regularly |
What's included
Cozy Heat OG wood-burning sauna stove (12kW or 18kW - selected at checkout)
Sauna stones - style selected at checkout (min 265 lbs / 12kW, min 353 lbs / 18kW)
Installation and operation manual
Not included (required for operation): Chimney and flue pipe installation (sold separately, installed by qualified professional). Optional: Additional sauna stones - each natural stone is unique in shape and an extra box allows selection of the best-fitting pieces.
Why the Cozy Heat OG Package stands out
Contemporary trilateral - the refined three-sided Cozy
The OG takes the base Cozy's three-sided body and refines it with clean lines and graceful curves at the transitions between faces. The result is a stove that reads as more considered and contemporary than the base Cozy's direct angularity, without the fully circular silhouette of the Cozy O. The most design-forward of the three-sided Cozy variants.
Wood-fired heat - the traditional sauna experience
A progressive 1 to 2-hour firing cycle builds the room to temperature naturally, with the fire visible through the glass door. The large stone mass - 265 lbs at 12kW, 353 lbs at 18kW - continues radiating heat after the fire dies down and produces soft, sustained steam. The authentic wood-fired sauna experience no electric heater can replicate.
Three-stage combustion - 25-40% less firewood
Primary, secondary, and tertiary air injection burns flue gases as a third combustion stage - 73.9% efficiency at 12kW, 81.3% at 18kW, up to 6x cleaner smoke gases. Certified to Germany's BlmSchV DIN EN 13240 Level 2 and EN 15821:2010 - the most demanding European emission standard for wood-burning stoves.
5mm stainless flame cutter
The most thermally stressed part of the stove is fabricated from 5mm stainless steel across every Cozy Heat model. Substantially thicker than industry standard, it resists warping and corrosion through years of sustained heat cycling and extends stove service life significantly over thinner alternatives.
12kW or 18kW with stones included
12kW for rooms 210-423 cu ft with standard insulation. 18kW for rooms 317-635 cu ft or rooms with cold surfaces. Stones are included at the correct quantity for the selected output. Each natural stone is unique in shape - an additional box allows selection of the best-fitting pieces for the OG's stone cavity.
No electrical - chimney only
No electrical connection required. The only infrastructure requirement is a properly specified and installed chimney. For sauna buildings without electrical supply or where a 240V circuit is impractical, a wood-burning stove is the appropriate and practical heating choice.
About Cozy Heat
Handmade in Estonia - German certified
Cozy Heat OG. The trilateral Cozy with contemporary curves - same proven engineering, more refined form.
Cozy Heat is an Estonian sauna stove manufacturer. The OG is the contemporary trilateral variant in the Cozy range - the same 5mm stainless flame cutter, three-stage combustion, German EN 15821:2010 certification, and 2-year warranty as every other Cozy model, in a body that combines the three-sided geometry of the base Cozy with the graceful curves and clean lines that give it a more design-forward character. For buyers who want the Cozy range's proven performance in the most refined version of the trilateral form, the OG is the appropriate choice.
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Complete package - Cozy OG stove and stones (style selected at checkout)
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Contemporary trilateral design - clean lines and graceful curves
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12kW (210-423 cu ft) or 18kW (317-635 cu ft) - select at checkout
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Three-stage combustion - 25-40% less firewood, EN 15821:2010 certified
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5mm stainless flame cutter, handmade in Estonia - 2-year warranty
Cozy vs Cozy O vs Cozy OG
Three Cozy designs - identical performance, different form
The base Cozy PKG (SKU 129772), Cozy O PKG (SKU 129776), and Cozy OG PKG (SKU 129780) are technically identical in all specifications: same output options, stone requirements, efficiency ratings, certifications, chimney requirements, and warranty. The differences are purely aesthetic. Base Cozy: utilitarian trilateral angular body - direct, functional form. Cozy O: circular rim design - soft, rounded, organic. Cozy OG: contemporary trilateral with graceful curves - the refined, design-forward version of the three-sided form. The correct choice depends entirely on which form best suits the sauna room's design intent and the buyer's visual preference.
A chimney of the correct specification must be installed by a qualified professional before the stove can be used. Use only dry, seasoned hardwood. Do not overfire. Sweep the chimney regularly. An additional box of stones is recommended since each natural stone is unique in shape.
Manuals and Documents
Warranty
2-year warranty
The Cozy Heat OG Sauna Stove is covered by a 2-year limited warranty from the date of purchase. The warranty covers defects in manufacturing and materials under normal use conditions. The warranty does not cover: damage caused by overfiring; failure to use dry, seasoned firewood; failure to regularly sweep the chimney; failure to follow installation requirements including proper chimney installation by a qualified professional; or improper modification of the stove. Proof of purchase from an authorized Cozy Heat dealer is required. We are an authorized Cozy Heat dealer.
