There are sauna heaters whose beauty lies in their understated elegance. The Cozy 12 O wood-fired sauna heater for saunas up to 12 m³ lets the stones speak for themselves—through a minimalist expanded metal grille that reveals the essentials and a combustion technology that combines maximum efficiency with gentle steam.
Natural Aesthetics – the Cozy 12 O Wood-Burning Sauna Stove for compact sauna rooms up to 12 m³
With a 90 kg stone capacity for sauna volumes up to 12 m³, the Cozy 12 O combines impressive heating performance with compact exterior dimensions. The classic O-shaped design made of expanded metal highlights the natural beauty of the sauna stones and makes the heater a subtle yet striking focal point in any sauna. COZY Heat from Estonia is known for its in-house manufacturing with strict quality control.
Expanded metal and structural steel – materials and design of the Cozy 12 O
The O-Design is the most classic model in the COZY series: a subtle expanded metal grille envelops the stone body, highlighting the natural texture of the stones. The body is made of 5 mm thick structural steel for lasting stability. Available in black or stainless steel, the Cozy 12 O wood-fired sauna heater fits seamlessly into both traditional and modern sauna rooms.
Efficient combustion, clean heating—the technology behind the Cozy 12 O wood-burning sauna stove
The optimized secondary air flow reduces wood consumption by at least 25%, and in tests by up to 40%. Flue gas emissions are only one-sixth of those from conventional models. Logs up to 33 cm are completely burned. The Cozy 12 O is certified according to BImSchV Stage 2, EN 15821, and DIN EN 13240—without additional filters or retrofitting.
Space-saving and versatile – the Cozy 12 O wood-burning sauna heater for saunas up to 12 m³
Whether with an interior or exterior firebox in the TW version—the Cozy 12 O adapts flexibly to various sauna concepts. With a side safety clearance of just 170 mm from combustible materials, it offers a wide range of installation options even in limited spaces. The TW version keeps the interior free of wood and ash.
90 kg of stone for gentle steam – the effect of the Cozy 12 O wood-fired sauna heater
The 90-kg stone mass effectively stores the heat from the wood fire and releases it as mild, even steam. Infusions evaporate gently, without aggressive heat spikes. The 5-year manufacturer’s warranty and certification according to European standards ensure peace of mind for many years. Matching sauna stones, a TW frame set, and a chimney ceiling vent are available as optional accessories.
Special features
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Wood-fired sauna stove experience
Original warmth with authentic character
A wood-burning sauna heater creates a particularly authentic sauna experience. The natural crackling of the fire, the intense radiant heat, and the characteristic scent of wood create an atmosphere that combines tradition, relaxation, and genuine sauna craftsmanship.
BImSchV2 certification
Tested emission values for safe and sustainable operation.
The BImSchV2 certification confirms compliance with strict legal requirements regarding emissions and efficiency. It stands for responsible operation with reduced pollutant values and ensures safety, sustainability, and peace of mind when using a wood-fired sauna heater.
Reliable temperature stability
Constant sauna climate for maximum comfort.
A high-quality Sauna Heater ensures a consistent temperature throughout the entire sauna session. The stable heat generation creates a pleasant, controlled sauna climate and increases comfort with every use.
Robust construction & durable materials
Quality for long-lasting use.
Sauna heaters made from high-quality materials are designed for high temperatures and regular use. Their solid construction ensures safety, reliability, and a long service life—even with intensive use.
Sophisticated chimney technology
Efficient exhaust for optimal stove performance.
The coordinated chimney technology ensures reliable exhaust of the flue gases and supports clean, even combustion. It contributes significantly to the performance, safety, and efficiency of the sauna stove and forms the technical basis for stable and controlled operation.
Scope of delivery
Everything at a glance – this is what's included!
Cozy 12 O Wood-Burning Sauna Stove (depending on the selected model: internal heating or TW external heating)
Aschekasten
Operating and Installation Instructions
Specifications
Model
COZY 12 O
Manufacturer
COZY Heat (Estonia)
Recommended sauna volume
up to 12 m³
Heating
Wood
Heating method
Internal heating or external heating (TW variant)
Fuel
Firewood logs up to 33 cm in length
Stone capacity
90 kg
Weight (heater)
49 kg
Weight (TW model)
57 kg
Material
5 mm structural steel
Surface
Black or stainless steel
Width (W1)
450 mm
Depth (L1)
480 mm
Total height (H)
1830 mm
Safety clearance on the side
170 mm
Safety clearance from rear wall
230 mm
Safety distance (front)
500 mm
Safety clearance from the ceiling
1130 mm
Certification
BImSchV Level 2, EN 15821:2010, DIN EN 13240
Warranty
5 years
Sauna stones
Not included – available as an option
Customer reviews
4.94 ★ (101)
Verified
Questions & Answers (FAQs)
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FinA Wellness Store
What should I look out for before ordering?
Please check all relevant information about the product (dimensions, technical requirements, power/water connections, space requirements, delivery conditions) before ordering. If you have any questions, we recommend a consultation before purchasing, especially for larger wellness products.
Which payment methods are accepted?
We accept the following payment methods:
PayPal
Store Pay
Visa
Mastercard
American Express
Maestro
UnionPay
Apple Pay
Google Pay
USDC
Bancontact
EPS
iDEAL
Klarna
When is the load applied?
The amount is debited at the time the order is completed or according to the selected payment method. For payment services such as Klarna, the respective payment terms of the provider also apply.
Can I change or cancel my order at a later date?
Changes or cancelations are possible as long as the order is not yet in production, commissioning or shipping. Please contact us immediately after placing your order.
Are there any restrictions on the right of withdrawal?
Yes, custom-made products, special designs and individually configured goods are excluded from the statutory right of withdrawal. We will clarify transparently whether a product falls under this before or at the latest when the order is placed.
How long does the delivery take and will I be informed?
The delivery time is indicated directly with the respective product. These are valid as long as the item is in stock. Deviating, individually agreed delivery times have priority. We will actively inform you in the event of delays. You will receive ongoing information on the shipping status.
How does delivery by forwarding agent work?
Delivery is standard free curbside. This means that the goods are delivered to the nearest point that can be reached by truck.
Important:
Access for trucks must be possible
Sufficient clearance width and height required
The customer is responsible for transportation from the curb
If required, additional services (e.g. delivery to the installation site) can be arranged in advance
Can I set a preferred delivery date?
Delivery date requests will be considered if possible. The shipping company will usually contact you one to two days before delivery to arrange an appointment. Fixed dates or times cannot be guaranteed. Express deliveries with exact delivery dates are possible on request.
What applies in the event of damage, missing parts or subsequent defects?
Please check the goods immediately upon delivery. Transport damage or missing parts must be documented and reported immediately with photos/videos.
The statutory warranty of 2 years applies to defects. We examine every case and take care of repair, replacement or an appropriate solution.
Cozy 12 O wood-burning sauna heater for saunas up to 12 m³ – BImSchV 2, indoor & outdoor firing
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Frau Jäger
Von Beratung bis Lieferung alles super.
Herzlichen Dank. Von der Beratung bis Lieferung alles top. Auch Liefertermin wurde eingehalten.
FinA Wellness Store
Anonym
Tolles Produkt, super Service!
Ich hatte eine super Beratung online. Da mir die Ausstellung zu weit weg war. Ich habe eine super tolle, freundlich und kompetente Beratung erhalten. Auch als es erst nicht richtig funktionierte wurde mir sofort geholfen. DANKE!
FinA Wellness Store
Stefan S
Wir haben grosse Freude an unserer neuen Dampfdusche
Wir haben grosse Freude an unserer neuen Dampfdusche. Bereits bei der Beratung hat das Team von FinA hervorragende Arbeit geleistet. Auch die Bestellung und Lieferung in die Schweiz verliefen absolut reibungslos und überraschend schnell.
Dank der klar verständlichen Installationsanleitung konnte unser lokaler Sanitärinstallateur die Montage unkompliziert und zügig durchführen.
Die Dampfdusche selbst überzeugt mit einem fantastischen, hochwertigen Design und ist ein echter Blickfang.
Herzlichen Dank für den hervorragenden Service - unsere Erwartungen wurden in jeder Hinsicht übertroffen.
FinA Wellness Store
Nicole N.
Whirlpool Xaluna
Wir sind mehr als nur zufrieden mit unseren Whirlpool:)
Wir werden auch unsere sauna wieder hier kaufen!
Man hat nicht das gefühl das sie die Produkte los werden wollen so wie in allen anderen Stores in den wir waren.
Wenn es Probleme oder Fragen gibt wird sofort weitergeholfen, am meisten begeistern war ich von Annemarie, sehr nett hilfbereit und man hat nie das gefühl das sie einem was andrehen will...
Zum Whirlpool selbst, schnelle lieferung ohne probleme!
Und unsere Erwartungen wurden mehr als übertroffen!!!
FinA Wellness Store
D. Müller
Die Sauna ist nur zu empfehlen! Super Support! Immer wieder
Die Sauna ist nur zu empfehlen! Super Support! Immer wieder.
Herzlichen Dank. Von der Beratung bis Lieferung alles top. Auch Liefertermin wurde eingehalten.
Liebe Frau Jäger, herzlichen Dank für Ihre tolle Bewertung und das schöne Foto! Es freut uns sehr, dass von der Beratung bis zur Lieferung alles gepasst hat – und dass der Liefertermin eingehalten wurde.
Ihre Bewertung ist übrigens unsere 100. überhaupt.
Als kleines Dankeschön erhalten Sie von uns einen Gutschein, die Details schicken wir Ihnen per E-Mail.
Herzliche Grüße, Ihr Team von Fina Wellness Store
Der defekte Temperaturfühler wurde zeitnahe unkompliziert per Post gesendet. Vielen Dank, unsere Sauna funktioniert wieder!
Vielen herzlichen Dank für dein Feedback! Es freut uns sehr, dass der neue Temperaturfühler schnell und unkompliziert bei dir angekommen ist und deine Harvia-Sauna wieder einwandfrei läuft. Genau dafür sind wir da – falls noch einmal etwas sein sollte, melde dich jederzeit gerne!
Wir wünschen dir nun viele entspannte Saunastunden. 🙏
I can recommend the company.
There was an issue with the shipping label on the package, why it was delayed, but everything was taken care of
Dear Louise,
thank you so much for your kind recommendation! You're absolutely right – there was a small hiccup with the shipping label that caused a delay. We're really glad we could sort it out quickly for you, because making sure everything is taken care of is exactly what matters most to us.
Thank you for your trust and patience – we'd love to welcome you again anytime! 🙏
Warm regards,
Annemarie & Franz – Fina Wellness Store
Hervorragender Service und extrem schnelle Lieferung
Ich habe bereits ein großes Chill-Tab-Eisbad bestellt und war schon damals sehr zufrieden. Auch dieses Mal kann ich mich nur wiederholen: Der Service und die Schnelligkeit dieser Firma sind wirklich ungeschlagen. Alles lief reibungslos, unkompliziert und angenehm. Man merkt sofort, dass hier mit viel Sorgfalt und Kundenorientierung gearbeitet wird. Vielen Dank — ich bestelle sehr gerne wieder!
Lieber Martin,
ganz herzlichen Dank für deine erneute Bewertung – wir freuen uns wirklich riesig, dass du uns die Treue hältst! Dass du dir nach deinem Eisbad nun schon wieder die Zeit nimmst, so liebe Worte zu hinterlassen, bedeutet uns unglaublich viel.
Genau das ist unser Anspruch: dass alles reibungslos, unkompliziert und angenehm läuft – und dass man die Sorgfalt dahinter spürt. Schön, dass wir dich auch dieses Mal wieder überzeugen konnten!
Wir freuen uns jetzt schon auf deine nächste Bestellung. Bis dahin alles Gute und viel Freude mit deinen Produkten! 🙏
Herzliche Grüße
Annemarie & Franz & Fina Wellness Store Team
