Harvia 36 Duo Steel 31 kW Wood Sauna Stove

• Model: WKPR36DUOS
• Product name: Harvia 36 Duo steel
• Wood-burning heater (DUO configuration)
• Power output: 31 kW
• Prime energy/fuel: Wood
• Recommended room volume: 494–1271 ft³
• Installation location: Floor
• Use environment: Interior - wet area
• Main material: Steel
• Outer shell made of stainless steel
• Color: Black
• Large glass hatch/door design
• Add firewood from outside the sauna
• Ash removal from outside the sauna
• Adjustable feet for easier installation height adjustment
• Pipe connection on top of the stove
• Pipe connection size: 115 mm
• Designed to allow more freedom when choosing sauna bench solutions
• Stone amount (listed): 132.3 lbs
• Stone size range: Ø10–15 cm
• Certificates: CE
• Certificates: EAC
• Safety distance front (non-combustible materials): 19.69 in
• Safety distance front (combustible materials): 19.69 in
• Safety distance behind (non-combustible materials): 3.94 in
• Safety distance behind (combustible materials): 19.69 in
• Safety distance right side (non-combustible materials): 3.94 in
• Safety distance right side (combustible materials): 19.69 in
• Safety distance left side (non-combustible materials): 3.94 in
• Safety distance left side (combustible materials): 19.69 in
• Safety distance (ceiling): 4.1 ft
• Room minimum height: 6.56 ft
• Optional compatibility: Can be equipped with a separate chimney model water tank
• Content of delivery: Frame
• Content of delivery: Glass door
• Content of delivery: Grill
• Content of delivery: Heater
• Content of delivery: Installation and operating instructions

• Brand: Harvia
• Model: 36 Duo
• Item number: WKPR36DUOS
• Power output: 31 kW
• Room volume (recommended): 494–1271 ft³
• Minimum room height: 6.56 ft
• Installation location: Floor
• Use environment: Interior - wet area
• Prime energy/fuel: Wood
• Main material: Steel
• Color: Black
• Width: 20.08 in
• Depth: 31.1 in
• Height: 3.41 ft
• Net weight: 176.4 lbs
• Stone amount (listed): 132.3 lbs
• Stone sizes: Ø10–15 cm
• Flue/pipe connection location: Top
• Flue/pipe connection size: 115 mm
• Certificates: CE, EAC
• EAN/GTIN: 6417659036641
• Gross weight: 177.5 lbs

If you want a wood-burning heater that supports larger sauna volumes while keeping the sauna room focused on bathing, this DUO-style design is built around that workflow. Loading firewood from outside the sauna helps keep the sauna space cleaner, while the glass door lets you enjoy the fire from the adjacent room.
With a specified 31 kW output and a recommended 494–1271 ft³ room volume range, the heater is positioned for bigger sauna rooms and stone-based steam. Installation details like adjustable feet and defined safety distances help support planning and placement in an interior wet-area sauna environment.
Harvia builds across the sauna category with product lines designed for consistent sauna experiences, from heaters to broader sauna solutions—supporting buyers who want a cohesive approach to sauna equipment selection over time.

At InHouse Wellness, we partner with Bathing Brands, the official distributor of Harvia products, to ensure a seamless and reliable delivery experience.

📦 Shipping Details

• Shipping Method: Orders are shipped via Ground or LTL Freight, depending on product size and weight
• Processing Time: Most Harvia products ship within 7–10 business days of order confirmation
• Tracking: You will receive a shipping confirmation email with tracking once your order leaves the warehouse

🏠 Delivery Method

• Curbside Delivery (Standard):
  
  Larger Harvia items (like heaters or control systems) are delivered via freight service with curbside drop-off
• The freight carrier will contact you to schedule a delivery appointment
• Customer is responsible for moving the product to its final location

🔁 Return Policy

• Return Window: Harvia products can be returned within 30 days of purchase if unused and uninstalled
• Return Authorization Required: Email CustomerService@BathingBrands.com to request a Return Authorization (RA) number before returning any item
• Return Shipping:
• If due to damage or distributor error: Bathing Brands covers the return shipping cost
• Standard returns: Customer is responsible for return shipping (insured, using the same method it was delivered)
• Restocking Fee: There is no fixed restocking fee, but a re-boxing fee ($20–$50) may apply if new packaging is needed
• Refund Process: Products are inspected upon return; if undamaged, a refund is issued for the full amount paid, less any applicable re-boxing fees
• If damage is found, you will be advised to file a claim with your carrier

❓ Questions?

Need help with freight quotes, rural delivery coordination, or return instructions?

📧 Contact us at Support@InHouseWellness.com

📱 Or email Bathing Brands directly at CustomerService@BathingBrands.com

Harvia products sold through InHouse Wellness are protected by a limited manufacturer’s warranty covering defects in materials and workmanship when used as intended and installed properly.

✅ Warranty Coverage – Residential Use

• Sauna heaters, steam generators, control units, and heating products: 2 years
• +1 extra year when registered at Harvia.com
• Hot tubs and cold tubs: 2 years
• Saunas (frames, panels, doors, hinges): 2 years
• Covers manufacturing defects only
• Accessories (excluding small consumables): 2 years

🏢 Warranty Coverage – Commercial or Non-Consumer Use

• Electric heaters, steam generators, and control units (excluding wear-and-tear components): 2 years
• Heating elements (including spares): 6 months
• Wood-burning heaters: 6 months
• Hot tubs and cold tubs: 6 months
• Saunas (frames, panels, doors, hinges): 1 year
• Covers manufacturing defects only
• Accessories (excluding small consumables): 1 year
• Spare parts (excluding heating elements): 1 year

❌ Not Covered

• Normal wear and tear, including heating elements, relays, bulbs, stones, and other consumables
• Natural wood aging (cracking, discoloration, shrinkage, pitch)
• Damage from improper installation, misuse, harsh chemicals, or non-intended environments
• Products altered or repaired without Harvia’s written approval
• Products with missing or defaced safety or serial number labels
• Use of non-Harvia parts or accessories

📌 Warranty Conditions

• Warranty starts from the original purchase date
• Applies only to new Harvia products sold through authorized dealers
• Installation must be completed by a licensed professional per Harvia’s instructions
• Products must be used under normal conditions as described in the owner’s manual
• For visible defects, warranty claims must be submitted before installation
• Warranty is void if the product is used outside of its intended residential or commercial classification

📦 Filing a Warranty Claim

• Report defects within a reasonable time frame:
• Within 2 months for residential customers
• Within 14 days for commercial customers
• Submit a written claim with:
• Proof of purchase
• Product serial number (if applicable)
• Description of the issue and use conditions
• Clear photos, especially for visible damage
• Harvia may request the defective item be returned for inspection

⚖️ Legal & Limitations

• Harvia may choose to repair, replace, or offer a price adjustment for defective products
• Harvia is not liable for indirect damages, such as lost profits or project delays
• For non-consumers, Finnish law governs the warranty terms
• Consumers are protected under applicable local consumer laws

📞 Warranty Support

For questions or warranty help, contact:

📧 Support@InHouseWellness.com

Or reach out to Harvia directly at:

Harvia Finland Oy, P.O. Box 12, 40951 Muurame, Finland

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.