Cozy Heat Quattro Pkg Wood-Burning Sauna Stove Package, Up to 18kW
The Cozy Heat Quattro Sauna Stove Package is a complete wood-burning sauna stove package in the Quattro series - the Cozy Quattro stove and sauna stones, available in 12kW (210-423 cu ft) and 18kW (317-635 cu ft) with stone style selected at checkout. The Quattro is the four-sided model in the Cozy Heat range - its name meaning "four" - and the most architecturally minimal of all the Cozy designs. Where the base Cozy and OG are trilateral, the O is circular-rimmed, and the SW is cylindrical, the Quattro presents clean, straight four-sided lines with understated elegance. Cozy Heat describes it as stylish and elegant with clean lines and a minimalist design. Its distinguishing feature beyond the four-sided form is the large viewing window - notably larger than the glass doors on the other Cozy models - which makes the dancing flames the focal point of the sauna room from a wide viewing angle. The same 5mm stainless flame cutter, three-stage combustion, and German EN 15821:2010 certification apply identically across the entire Cozy Heat range.
Four-sided minimalist form and the large viewing window
The Quattro body is four-sided with clean, straight lines - a geometry that reads as architecturally precise and modern in the sauna room. Where the three-sided Cozy models have an angular, dynamic quality and the cylindrical SW commands attention through its dramatic rounded form, the Quattro's square or rectangular profile is restrained and quiet - it sits in the sauna room as a functional object of considered minimalist design rather than a statement piece. The large viewing window is what elevates the Quattro above the merely functional: the generous glass panel lets the fire inside be viewed from a wide angle throughout the session, making the dancing flames an integral part of the sauna experience rather than a detail visible only when standing directly in front of the door. Cozy Heat uses the word "mesmerizing" to describe the glow of the flames seen through the Quattro's window - and the large format of that window is what justifies it.
Understated elegance - the minimalist Cozy
The Quattro is for buyers who approach sauna design the way a Scandinavian architect approaches a building: functional clarity, clean geometry, nothing superfluous. The four-sided body has no curves, no rim elements, no cylindrical drama. Its surfaces are flat and its lines are straight. This is the design language of Nordic minimalism - the same aesthetic that produced the flat-white interiors, clear-finished pine walls, and bare wooden benches of the classic Finnish sauna. In that context, the Quattro is the most authentic expression of the sauna stove as a working object rather than a decorative element. The large glass window is the one concession to visual indulgence - and it is a practical one, since watching the fire is part of the wood-fired sauna ritual that no electric heater can offer.
Complete package - same proven Cozy Heat engineering
The Quattro package includes the stove and sauna stones (style selected at checkout), with the correct stone load pre-specified for each output level: a minimum 265 lbs for the 12kW and a minimum 353 lbs for the 18kW. The flame cutter is 5mm stainless steel. The combustion system is three-stage - primary, secondary, and tertiary air - producing 25-40% less firewood consumption and 73.9% or 81.3% thermal efficiency at 12kW and 18kW respectively. A chimney installation is required and sold separately. All other installation requirements - dry seasoned hardwood, qualified chimney connection, no shared flue - are identical across the Cozy range.
Wood-burning sauna stove package with clean four-sided minimalist design - available in 12kW (210-423 cu ft) and 18kW (317-635 cu ft), select at checkout. Includes Cozy Quattro stove and sauna stones (stone style selected at checkout). Four-sided body with clean straight lines - understated elegance, Nordic minimalist aesthetic. Large viewing window - wide-angle view of dancing flames throughout the session. 5mm stainless steel flame cutter. Three-stage combustion - 25-40% less firewood. 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) Four-sided minimalist design - clean straight lines Large viewing window for fire watching Understated Nordic elegance Wood-burning - no electrical required Three-stage combustion 25-40% less firewood than comparable stoves 5mm stainless steel flame cutter EN 15821:2010 certified German BlmSchV DIN EN 13240 Level 2 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 |
Four-sided body - clean straight lines, minimalist, large viewing window |
| 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 |
Four-sided body - large viewing window |
| Flame cutter material |
5mm stainless steel |
| Body construction |
Steel |
| Door / window |
Large glass viewing window |
| 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 Quattro 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 Quattro Package stands out
Four-sided minimalist form
The only four-sided model in the Cozy Heat range. Clean straight lines and a minimalist body create an understated elegance suited to Nordic minimalist sauna interiors - clean-finished pine, bare wood benches, white or neutral walls - where a stove should read as a precise functional object rather than a decorative centrepiece. The most architecturally restrained design in the Cozy family.
Large viewing window - the Quattro's signature
The large glass window is the Quattro's most distinctive feature - notably larger than the viewing doors on other Cozy models. It provides a wide-angle view of the dancing flames throughout the session, making the fire itself an integral part of the sauna experience. Cozy Heat describes the glow of the flames through the Quattro window as mesmerizing.
Wood-fired heat - the traditional sauna experience
A progressive 1 to 2-hour firing cycle builds the room naturally. 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 - including the ritual of fire-tending that the large window makes visible throughout the session.
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. Identical combustion engineering to every other Cozy Heat model.
5mm stainless flame cutter
The most thermally stressed part is fabricated from 5mm stainless steel - substantially heavier than industry standard - across every Cozy Heat model. Resists warping and corrosion through years of firing cycles and extends stove service life significantly over lower-specification alternatives.
12kW or 18kW with stones included
12kW for rooms 210-423 cu ft. 18kW for rooms 317-635 cu ft or rooms with glass, tile, or masonry cold surfaces. Stones at the correct minimum quantity for the selected output are included. Each natural stone is unique in shape - an additional box allows selection of the best-fitting pieces for the Quattro's stone cavity.
About Cozy Heat
Handmade in Estonia - German certified
Cozy Heat Quattro. Four sides, clean lines, and the largest window in the Cozy range.
Cozy Heat is an Estonian sauna stove manufacturer. The Quattro is the minimalist model in the Cozy family - four-sided, clean-lined, and quietly elegant. The same 5mm stainless flame cutter, three-stage combustion, German EN 15821:2010 certification, and 2-year warranty as every Cozy model, in a body that prioritises architectural restraint over visual drama. The large viewing window is the Quattro's singular concession to spectacle - and it is the most practical kind, since watching the fire is the wood-fired sauna experience that no electric heater can offer. For sauna rooms built on Nordic minimalist principles, the Quattro is the correct Cozy.
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Complete package - Cozy Quattro stove and stones (style selected at checkout)
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Four-sided minimalist design - clean straight lines, understated elegance
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Large viewing window - wide-angle fire viewing throughout the session
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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, 5mm stainless flame cutter, made in Estonia - 2-year warranty
Five Cozy designs - same performance, different form
Choosing between the five Cozy Heat models
Base Cozy (SKU 129772): utilitarian trilateral angular body. Cozy O (SKU 129776): circular rim design, soft and organic. Cozy OG (SKU 129780): trilateral with graceful contemporary curves. Cozy SW (SKU 129784): sleek cylindrical column, dramatic pillar form. Cozy Quattro (SKU 129788): four-sided minimalist body with large viewing window. All five are technically identical in output, stone requirements, efficiency, certifications, chimney requirements, and warranty. The choice is purely aesthetic: select the form that best fits the sauna room's design intent and the buyer's preference for how the stove should look and feel within the space. For Nordic minimalism and fire-watching: the Quattro. For drama: the SW. For organic softness: the O. For refined three-sided form: the OG. For direct utility: the base Cozy.
A chimney of the correct specification must be installed by a qualified professional. Use only dry, seasoned hardwood. Do not overfire. Sweep the chimney regularly.
Manuals and Documents
Warranty
2-year warranty
The Cozy Heat Quattro 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.
