The Harvia 20 Duo is a wood-burning sauna stove and fireplace combined into a single, well-crafted unit. It heats your sauna room to bathing temperature while letting you enjoy the warmth and ambiance of an open fire through its large steel-framed glass door. Built with a high-quality stainless steel outer casing, the Duo is designed for durability and long-term performance. Sauna rocks are included, and the stove ships with an adaptor that converts the metric flue connection to a standard 6-inch pipe — making installation more straightforward for North American setups.
Why Customers Choose the Harvia 20 Duo
- Two-in-one design: wood-burning sauna stove and fireplace in a single unit
- Large steel-framed glass door for a clear view of the fire
- High-quality stainless steel outer casing for lasting durability
- Sauna rocks included — no separate purchase required
- Includes a metric-to-6" pipe adaptor for easier North American installation
- Compatible with an optional pipe-mounted water heater accessory
- Suitable for sauna rooms from 282 to 706 cubic feet
Product Highlights
Sauna Stove and Fireplace in One
The Duo's combined design lets you heat your sauna to bathing temperature while enjoying the visual warmth of a wood fire — a feature that sets it apart from standard sauna stoves.
Large Glass Door
The generously sized, steel-framed glass door provides an unobstructed view of the fire, enhancing the traditional sauna atmosphere and adding a focal point to your sauna room.
Stainless Steel Construction
The outer casing is made from high-quality stainless steel, chosen for its resistance to heat, moisture, and the demanding conditions of a sauna environment.
Sauna Rocks Included
The Harvia 20 Duo ships with sauna rocks, so you can get your setup ready without sourcing stones separately.
Optional Water Heater Compatibility
The stove can be equipped with a pipe-mounted water heater accessory, adding hot water capability to your sauna setup when desired.
North American Pipe Adaptor Included
An adaptor that converts the metric flue connection to a standard 6-inch pipe size is included, simplifying chimney installation for North American builds.
Specifications
| Model | Harvia 20 Duo |
| SKU | WKPR20DUOS |
| Fuel Type | Wood |
| Stove Type | Floor Standing / Combination Stove-Fireplace |
| Outer Casing Material | Stainless Steel |
| Door Frame Material | Steel |
| Door Type | Glass |
| Dimensions | 17"D x 21"W x 30"H + 11" flue extension |
| Room Size (Cubic Feet) | 282 – 706 cu ft |
| Sauna Rocks | Included (3 boxes required) |
| Pipe Adaptor | Included (metric to standard 6" pipe) |
| Optional Accessory | Pipe-mounted water heater (sold separately) |
| Weight | 300 lbs |
| Barcode (EAN) | 6417659001137 |
| Vendor | Finnish Sauna Builders |
Ideal For
- Homeowners building or upgrading a traditional wood-heated sauna
- Bathers who want the ambiance of a fireplace alongside sauna heat
- Sauna rooms between 282 and 706 cubic feet
- Customers looking for a complete, ready-to-install wood-burning stove package
- Those who may want to add a pipe-mounted water heater in the future
Important Information
- Three boxes of sauna rocks are required for operation. Rocks are included with this stove.
- A proper chimney and flue system must be installed before use. A Chimney Installation Manual and Operations Manual are available — contact us for documentation.
- This stove must be installed in accordance with all applicable local building codes and fire safety regulations.
- Installation should be performed by a qualified professional experienced with wood-burning appliances.
- Maintain adequate clearance from combustible materials as specified in the installation documentation.
- The pipe-mounted water heater is an optional accessory and is sold separately.
- Never leave a burning stove unattended. Keep children and pets at a safe distance during operation.
- Use only dry, seasoned firewood. Do not burn treated wood, garbage, or accelerants.
Frequently Asked Questions
Do sauna rocks come with this stove?
Yes. The Harvia 20 Duo includes sauna rocks. Three boxes of rocks are required for operation, and they are included with your purchase.
What is the difference between this stove and a standard sauna stove?
The Harvia 20 Duo combines a wood-burning sauna stove with a fireplace-style glass door, allowing you to see and enjoy the fire while the sauna heats up. Standard sauna stoves typically do not have this open-fire viewing feature.
What room size is this stove designed for?
The Harvia 20 Duo is rated for sauna rooms between 282 and 706 cubic feet. Room volume, insulation quality, and construction materials all affect heating performance, so consult the product documentation for your specific setup.
Do I need a chimney for this stove?
Yes. A proper chimney and flue system is required. The stove includes an adaptor that converts the metric flue connection to a standard 6-inch pipe size for North American installations. Professional installation is strongly recommended.
Can I add a water heater to this stove?
Yes. The Harvia 20 Duo is compatible with an optional pipe-mounted water heater accessory, which is sold separately. This allows you to heat water for rinsing or other sauna-related use.
What fuel does this stove use?
The Harvia 20 Duo is a wood-burning stove. Use only dry, seasoned firewood. Do not use treated wood, pellets, or any accelerants.
Can I install this stove myself?
Installation should be performed by a qualified professional experienced with wood-burning appliances. Local building codes may require a licensed contractor or inspector approval before use.
The Harvia 20 Duo is a thoughtfully designed wood-burning sauna stove that brings together reliable heat output and the visual appeal of a fireplace. If you're looking for a durable, complete package for your sauna room, this is a strong choice. Order today and our team will be in touch to coordinate delivery and answer any installation questions.