Harvia Pro 36 DUO 31 kW Wood-Burning Sauna Stove with Fireplace
Harvia
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Holds 132 lb of stones — 3 × 44 lb boxes covers it.
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Total—
- Description
- What's Included
- Required to Operate
- Product Specifications
- Sizing
- Installation & Use Notes
- FAQs
- Downloads
The Harvia Pro 36 DUO is a 31 kW wood-burning sauna stove for rooms of 494–1,271 cubic feet. It takes 132 lb of 10-15cm sauna stones (sold separately), needs no electrical supply, and requires a code-compliant chimney.
The Pro is the workhorse of Harvia's wood-burning range: a heavy steel firebox with an open stone bed, built to be specified around the room rather than the other way round. Wood sauna layout is nearly always constrained by something — where the chimney can run, whether you can feed the fire from outside the hot room, whether you need hot wash water without a second heater. Harvia builds this firebox in the configurations that solve those constraints without forcing you to change stove size.
- Sophisticated 2-in-1 design
- Stainless steel outer casing
- Large steel-framed glass door
- Floor model with adjustable feet
- Doubles as a fireplace in the adjoining room
Sauna Stove, Adjustable Legs, Stove Door, Ash Box, Installation and Operation Manual
These are not included. You need them before the sauna will run.
Sauna Stones132 lb — Harvia specifies 3 × 44 lb boxes of Harvia AC3020. Never run the unit empty. Chimney
A listed, code-compliant chimney system, plus floor protection where the manual or local code requires it.
| Harvia Part Number | WKPR36DUOS |
| Power Output | 31 kW |
| Sauna Room Volume | 494–1,271 adjusted cu ft |
| Stone Capacity | 132 lbs (59.9 kg) |
| Recommended Stones | Harvia AC3020 |
| Color / Finish | Stainless Steel |
| Material | Steel |
| Dimensions (W × D × H) | 20" (510mm) × 31" (790mm) × 32" (810mm) |
| Weight (Empty) | 176.4 lbs (80 kg) |
| Weight Loaded with Stones | approx. 308 lbs |
| Installation | Floor Mount |
| Certification | CE, EAC |
| Warranty | 2 years (consumer use, +1 year if registered with Harvia); 6 months (commercial use) |
| Ships | LTL freight, curbside |
| Made In | Finland |
Harvia lists this model with CE, EAC marks. These are the European and Eurasian conformity marks, not a UL or ETL listing for North America — confirm requirements with your building department and insurer.
The Harvia Pro 36 DUO is rated for 494–1,271 adjusted cubic feet.
Adjusted cubic feet = width × depth × height in feet, plus 45 cu ft for every square foot of glass, tile, concrete or stone, plus 15 cu ft for every square foot of exposed log wall. A 6 × 7 ft room with a 7 ft ceiling is 294 raw cu ft — add a full-glass door and it becomes 834. Always size to the adjusted number.
| Model | Output | Room Volume | Stones |
|---|---|---|---|
| Pro 20 | 24.1 kW | 283–706 cu ft | 88 lbs |
| Pro 20 DUO | 24.1 kW | 282–706 cu ft | 88 lbs |
| Pro 20 ES | 24.1 kW | 283–706 cu ft | 88 lbs |
| Pro 20 LS | 24.1 kW | 283–706 cu ft | 88 lbs |
| Pro 20 RS | 24.1 kW | 283–706 cu ft | 88 lbs |
| Pro 20 SL | 24.1 kW | 283–706 cu ft | 88 lbs |
| Pro 26 | 26.6 kW | 353–918 cu ft | 110 lbs |
| Pro 36 | 31 kW | 494–1,271 cu ft | 132 lbs |
| Pro 36 DUO | 31 kW | 494–1,271 cu ft | 132 lbs |
- Confirm the flue diameter and whether your chimney connects top or rear before you order chimney components. This is the most common ordering mistake on wood sauna builds.
- Harvia wood stoves use 115 mm (4.5 in) European flue pipe. A North American 6 in chimney needs the Harvia WZ115155 adapter.
- A solid-fuel appliance usually needs a permit and an inspection in the US, and your insurer will normally want to see the sign-off.
- Burn the stove outdoors or with the room ventilated for the first firing to cure the paint. Load stones loosely by hand and re-stack them once a year.
- This is an LTL freight item. It arrives curbside on a pallet and the carrier calls to book a window — have two people and a pallet jack or dolly ready, and note any damage on the delivery receipt before you sign.
- Stones ship separately on their own freight because of the weight.
Will the Harvia Pro 36 DUO connect to a US chimney?
Not directly. Harvia wood stoves are built with 115 mm (4.5 in) European flue pipe, so a North American 6 in system needs the Harvia WZ115155 adapter. Confirm your flue diameter and whether the connection is top or rear before ordering.
How does the Harvia Pro 36 DUO work as a fireplace?
The DUO firebox passes through the sauna wall, heating the sauna on one side while presenting an open fire view to the adjoining room.
How long does the Harvia Pro 36 DUO take to heat up?
Harvia does not publish a figure. As a rule of thumb a correctly sized, well-insulated room with a full stone charge is ready 45 to 75 minutes after lighting, and the stones keep giving heat back long after the fire dies down.
Choose options
- Description
- What's Included
- Required to Operate
- Product Specifications
- Sizing
- Installation & Use Notes
- FAQs
- Downloads
The Harvia Pro 36 DUO is a 31 kW wood-burning sauna stove for rooms of 494–1,271 cubic feet. It takes 132 lb of 10-15cm sauna stones (sold separately), needs no electrical supply, and requires a code-compliant chimney.
The Pro is the workhorse of Harvia's wood-burning range: a heavy steel firebox with an open stone bed, built to be specified around the room rather than the other way round. Wood sauna layout is nearly always constrained by something — where the chimney can run, whether you can feed the fire from outside the hot room, whether you need hot wash water without a second heater. Harvia builds this firebox in the configurations that solve those constraints without forcing you to change stove size.
- Sophisticated 2-in-1 design
- Stainless steel outer casing
- Large steel-framed glass door
- Floor model with adjustable feet
- Doubles as a fireplace in the adjoining room
Sauna Stove, Adjustable Legs, Stove Door, Ash Box, Installation and Operation Manual
These are not included. You need them before the sauna will run.
Sauna Stones132 lb — Harvia specifies 3 × 44 lb boxes of Harvia AC3020. Never run the unit empty. Chimney
A listed, code-compliant chimney system, plus floor protection where the manual or local code requires it.
| Harvia Part Number | WKPR36DUOS |
| Power Output | 31 kW |
| Sauna Room Volume | 494–1,271 adjusted cu ft |
| Stone Capacity | 132 lbs (59.9 kg) |
| Recommended Stones | Harvia AC3020 |
| Color / Finish | Stainless Steel |
| Material | Steel |
| Dimensions (W × D × H) | 20" (510mm) × 31" (790mm) × 32" (810mm) |
| Weight (Empty) | 176.4 lbs (80 kg) |
| Weight Loaded with Stones | approx. 308 lbs |
| Installation | Floor Mount |
| Certification | CE, EAC |
| Warranty | 2 years (consumer use, +1 year if registered with Harvia); 6 months (commercial use) |
| Ships | LTL freight, curbside |
| Made In | Finland |
Harvia lists this model with CE, EAC marks. These are the European and Eurasian conformity marks, not a UL or ETL listing for North America — confirm requirements with your building department and insurer.
The Harvia Pro 36 DUO is rated for 494–1,271 adjusted cubic feet.
Adjusted cubic feet = width × depth × height in feet, plus 45 cu ft for every square foot of glass, tile, concrete or stone, plus 15 cu ft for every square foot of exposed log wall. A 6 × 7 ft room with a 7 ft ceiling is 294 raw cu ft — add a full-glass door and it becomes 834. Always size to the adjusted number.
| Model | Output | Room Volume | Stones |
|---|---|---|---|
| Pro 20 | 24.1 kW | 283–706 cu ft | 88 lbs |
| Pro 20 DUO | 24.1 kW | 282–706 cu ft | 88 lbs |
| Pro 20 ES | 24.1 kW | 283–706 cu ft | 88 lbs |
| Pro 20 LS | 24.1 kW | 283–706 cu ft | 88 lbs |
| Pro 20 RS | 24.1 kW | 283–706 cu ft | 88 lbs |
| Pro 20 SL | 24.1 kW | 283–706 cu ft | 88 lbs |
| Pro 26 | 26.6 kW | 353–918 cu ft | 110 lbs |
| Pro 36 | 31 kW | 494–1,271 cu ft | 132 lbs |
| Pro 36 DUO | 31 kW | 494–1,271 cu ft | 132 lbs |
- Confirm the flue diameter and whether your chimney connects top or rear before you order chimney components. This is the most common ordering mistake on wood sauna builds.
- Harvia wood stoves use 115 mm (4.5 in) European flue pipe. A North American 6 in chimney needs the Harvia WZ115155 adapter.
- A solid-fuel appliance usually needs a permit and an inspection in the US, and your insurer will normally want to see the sign-off.
- Burn the stove outdoors or with the room ventilated for the first firing to cure the paint. Load stones loosely by hand and re-stack them once a year.
- This is an LTL freight item. It arrives curbside on a pallet and the carrier calls to book a window — have two people and a pallet jack or dolly ready, and note any damage on the delivery receipt before you sign.
- Stones ship separately on their own freight because of the weight.
Will the Harvia Pro 36 DUO connect to a US chimney?
Not directly. Harvia wood stoves are built with 115 mm (4.5 in) European flue pipe, so a North American 6 in system needs the Harvia WZ115155 adapter. Confirm your flue diameter and whether the connection is top or rear before ordering.
How does the Harvia Pro 36 DUO work as a fireplace?
The DUO firebox passes through the sauna wall, heating the sauna on one side while presenting an open fire view to the adjoining room.
How long does the Harvia Pro 36 DUO take to heat up?
Harvia does not publish a figure. As a rule of thumb a correctly sized, well-insulated room with a full stone charge is ready 45 to 75 minutes after lighting, and the stones keep giving heat back long after the fire dies down.
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FAQ
Ordering & Payment
Are you an authorized dealer?
Yes. We're an authorized dealer for every brand we carry, so your purchase includes the full manufacturer warranty.
Do you offer financing?
Yes. You can pay over time with Shop Pay Installments at checkout on orders up to $30,000. Available plans and rates depend on your order total and approval, and you'll see your options before you pay.
Shipping & Delivery
Where do you ship?
We currently ship within the continental United States only. We don't ship to Alaska, Hawaii or Canada at this time.
How long will my order take?
Orders are processed within 1-2 business days, and orders placed before 2 PM EST start processing the same day. Orders don't process or ship on weekends or holidays, so anything placed after 2 PM on Friday or over the weekend starts processing the next business day. In-stock items usually arrive within 3-9 business days.
Some products are made to order and take longer. When that's the case, the lead time is listed on the product page.
How does freight delivery work?
Larger items ship by freight. Here's what to expect:
- The carrier will call to schedule a delivery window, Monday to Friday
- Someone 18 or older needs to be there to receive and sign for it
- Delivery is curbside, lowered by liftgate to your driveway or nearest accessible spot
- Please double check your phone number at checkout so you don't miss the carrier's call
Installation
Does it come assembled?
It depends on the product. Some items arrive ready to use, while others need assembly. Check the product page for what's included, and download the manual for full setup instructions.
Do I need a professional to install it?
Many products can be set up yourself. For anything involving a natural gas line, hardwired electrical or built-in installation, we recommend a licensed professional and checking your local codes.
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