Cozy Heat COZY O-TW Through-The-Wall Wood Sauna Stove 12 kW

• Wood-burning sauna stove
• Through-the-wall (TW) configuration for loading from outside the sauna room
• Nominal heat capacity: 12 kW
• Intended hot room size: 6–12 m³
• Intended hot room size: 210–423 ft³
• Designed for providing dry or humid heat in a sauna
• Steam support by throwing water on heated stones
• Steel construction
• Black steel finish
• Floor mount / thru-wall installation type
• Top flue connection location
• Minimum safety distance to inflammable materials (sides): 170 mm
• Minimum safety distance to inflammable materials (back): 230 mm
• Minimum safety distance to inflammable materials (front): 500 mm
• Minimum safety distance from top of stove to ceiling (12-series): 1130 mm
• Wood logs up to 33 cm / 13 in length (fuel specification)
• Maximum firewood length: 329 mm
• Firewood diameter range: 80–120 mm
• Max fuel load: 8 kg
• Fuel type: wood
• Chimney pipe diameter: D114 mm / 4.48 in
• Necessary draught: 12 Pa
• Minimum cross-section of smoke flue: 7 850 mm²
• Combustion air separated into multiple paths for more efficient burning
• Flue gases burn to generate heat (combustion design)
• Smoke gases stated as cleaner versus comparable heaters
• Reduced fuel consumption stated versus comparable heaters
• Stove stones are not included
• Stone size range (HEAT12): 7.5–10 cm
• Stove stone mass range (HEAT12): 100–120 kg
• Amount of stones (12-series technical data): 120 kg
• Outer frame included
• Heater body included
• Cleaning hatch included
• Heater door with glass included
• Ash box included
• Installation and operation manual included
• Combustion chamber extension included for TW model
• Hearth frame: not included for TW configuration (as specified)
• Not suitable for installation in a shared flue system (as specified)

• Model: COZY O-TW
• Variant: 12 kW
• Primary Fuel: Wood
• Nominal Heat Capacity: 12 kW
• Recommended Hot Room Size: 210–423 ft³ (6–12 m³)
• Construction Material: Steel
• Color/Finish: Black Steel
• Flue Connection Location: Top
• Chimney Pipe Diameter: D114 mm (4.48 in)
• Maximum Firewood Length: 329 mm (12.95 in)
• Firewood Diameter Range: 80–120 mm (3.15–4.72 in)
• Stove Width: 450 mm (17.71 in)
• Stove Depth (from handle): 670 mm (26.37 in)
• Stove Height: 700 mm (27.55 in)
• Product Weight: 125 lb
• Shipping Weight (with sauna stones): 367 lb
• Safety Distance (Sides): 170 mm (6.69 in)
• Safety Distance (Back): 230 mm (9.05 in)
• Safety Distance (Front): 500 mm (19.68 in)
• Minimum Room Height: 1828 mm (72 in)
• Certifications/Listings: German BIMSCH certificate
• Standard/Rating Reference: EN 15821:2010, DIN EN 13240 (level 2)
• Warranty: 2-Year Warranty (Consumer Use)

The COZY O-TW is built for sauna users who want authentic wood-fired operation with a more practical workflow. The through-the-wall layout lets you feed the fire from outside the sauna room, helping keep the hot room focused on heat, stones, and steam rather than fuel handling and debris.
This stove supports both dry heat and humid sauna use by pairing a wood firebox with substantial stone loading (stones not included). With defined clearance guidance and a top flue layout, it can be planned into purpose-built sauna rooms where installation details, safety distances, and venting are treated as part of the build.
At the brand level, Cozy Heat’s product line centers on wood-fired sauna stoves designed for sauna bathing, offered across multiple configurations (including TW options) to fit different room sizes and layouts. The result is a stove family intended to deliver consistent sauna heat while supporting straightforward day-to-day use.

Most Cozy Heat orders arrive within up to 21 days. Timing can vary by destination, carrier scheduling, and product availability. Orders paid through Affirm can add 5 to 7 days.

Order Processing

• Order Verification: After you place an order, we confirm availability with Cozy Heat or an authorized distribution partner in our network.
• Payment Authorization: Once availability is confirmed, your payment method is charged.
• Order Placement: We then place the order with the supplier for fulfillment.
• Order Cutoff Time: Orders placed after 2:00 PM CST may begin processing the next business day.

Shipping Rates and Delivery Timeline

• Free Shipping: Shipping is FREE to the continental U.S. (lower 48 states).
• Handling Time: 1 to 10 business days
• Transit Time: 1 to 14 business days
• Brand Timing Note: Cozy Heat products typically deliver within up to 21 days.
• Affirm Note: Orders paid through Affirm can delay shipping timelines by 5 to 7 days.

Shipment Confirmation and Tracking

• Tracking Email: You will receive a shipment confirmation email once your order ships with tracking details.
• Tracking Activation: Tracking may take up to 24 hours to populate after the label is created.
• Carrier Selection: The carrier may vary based on cost and service quality.
• Delivery Scheduling: Most freight carriers attempt to contact you 1 to 2 days before delivery to schedule a drop-off time, but this is not guaranteed.

Delivery Options

• Standard Delivery: Curbside delivery only. You are responsible for bringing the shipment inside.
• Optional Upgrades: White Glove Service (inside placement) and Premium Installation Service (inside placement plus assembly and installation) may be available for an additional fee at checkout, subject to availability in your area. These services can add 2 to 5 business days for scheduling and coordination.

Pre Order and Special Order Items

• If an item is pre order or out of stock, we will email or call to confirm you are comfortable with extended shipping times before your payment is processed.
• Delivery timelines are estimates and may change due to production, freight, or carrier factors.
• Outside the lower 48 states: We can often arrange shipping, but it is not part of our standard offering. Contact us for a custom quote.

Damages

InHouseWellness.com is not liable for products damaged or lost during shipping. If your order arrives damaged, contact the carrier immediately to file a claim, save all packaging and damaged goods, and we will assist with coordination and documentation as needed.

InHouse Wellness extends the Cozy Heat manufacturer warranty to the original purchaser. Warranty coverage, terms, and remedies are set by Cozy Heat. Any warranty claims should be communicated directly to Cozy Heat.

Warranty Period

• Cozy Heat sauna stoves: 24 months from the date of purchase (proof required via purchase receipt/invoice).

What Cozy Heat Covers

Cozy Heat’s warranty covers defects caused by manufacturing errors during the warranty period.

What’s Not Covered (Manufacturer-Stated Exclusions)

The warranty does not cover the following effects caused by the combined impact of temperature and steaming water:

• Metal deformations
• Effects on surface covering/finish
• Effects on door glass

How to Start a Warranty Claim (Contact Cozy Heat)

Warranty claims should be submitted to Cozy Heat and should include:

• Photos showing the defect
• Copies of purchase documents (receipt/invoice)

When you’re investing in premium wellness equipment, you want more than just a good deal—you want the right partner. Here’s why our customers trust us over anyone else:

• Guaranteed Best Pricing – We work directly with manufacturers, so you never overpay. If you find a lower price, we don’t just match it—we beat it.
• Unbeatable Shipping Times – Even if others claim faster delivery, we win. Your order ships either from our Austin, TX warehouse or straight from the manufacturer—fast, reliable, and trackable.
• White Glove Delivery & Installation – We offer professional delivery, assembly, and installation so your new equipment is set up perfectly from day one.
• U.S.-Based, Real Support – Our team is right here in the USA, ready to help by phone, text, or email—before, during, and long after your purchase.
• Since 2011 – Over a decade of helping health and wellness consumers connect with top brands and the perfect products for their needs.
• Factory Warranties Included – Full manufacturer coverage on every product, plus our help if you ever need to file a claim.
• Exclusive Video & eBook Guides – From maintenance tips to usage tutorials, we give you the knowledge to get the most from your investment.

Bottom line: We don’t just sell equipment—we deliver the fastest shipping, the most reliable support, and the kind of buying experience you’ll tell your friends about.