The Harvia Pro 20 SL is a premium wood-burning sauna stove with exterior feed, designed for serious heat enthusiasts who value clean, uninterrupted sessions. It also delivers the cozy ambiance of a second room, loading wood from outside while your sauna stays smoke- and ash-free. (Model WKPR20SLM, SAK73985)

• Powerful heating output: 24.1 kW to efficiently heat medium to large saunas, covering 283 to 706 cubic feet for consistent, ocean-deep warmth.
• Exterior feed system: Load firewood from an adjacent room or outside wall, keeping the sauna space pristine and free of ash and debris.
• Dual-room heating: Simultaneously warms the sauna and creates a welcoming, fireplace-like ambiance in the dressing area or lounge.
• Adjustable door direction: Simple hands-on adjustment to fit your room layout and installation preferences.
• Massive stone capacity: Large sauna stone load retains heat for hours, delivering steady löyly and easier room drying after use.
• Flexible installation: Upper and rear connection openings plus a soot opening support customized setup for your space.
• Sauna stones requirement: Requires a minimum of 88 lbs of sauna stones (sold separately) to achieve optimal humidity and steam.
• Durable construction: Built in cast iron to withstand demanding thermal cycles and daily use in homes and cabins.

This stove solves the hassle of traditional woodfire loading by enabling you to feed from another room, keeping your sauna clean and your session uninterrupted. The 24.1 kW output ensures rapid, even heating across a wide range of sauna sizes, while the stone retention maintains consistent warmth long after the fire has settled. The exterior feed design adds the ambiance of a crackling fireplace in the adjoining space, letting guests enjoy the view and scent of wood as you reach optimal sauna temperature. With adjustable door orientation and flexible pipe connections, installation is tailored to your layout, making the Harvia Pro 20 SL a practical, long-term centerpiece for a home spa or cabin retreat.