Harvia Pro 20 Duo SL Wood Burning Sauna Heater Steel | WK200SLUX

Experience the pinnacle of the 2-in-1 sauna heater and fireplace concept with the Harvia Pro 20 Duo SL Wood Burning Sauna Heater, a unique and beautifully engineered product that allows you to heat your sauna to bathing temperature whilst simultaneously enjoying the warmth and atmosphere of a real fireplace in the adjacent room. The Pro 20 Duo SL elevates this concept further with a premium high-quality stainless steel outer casing that ensures exceptional durability and resistance to the constant heating and cooling cycles of regular sauna use -- a significant step up from the standard Pro 20 SL. The impressive large glass door creates a beautiful fireplace effect in the adjacent room, Harvia's world-class wood-burning technology delivers an authentic Finnish sauna experience, and the robust 10mm steel fire chamber cover speaks to the exceptional engineering quality throughout. With a powerful 24.1kW output suitable for sauna rooms of 8 to 20 cubic metres, designed, engineered and handmade in Finland, the Pro 20 Duo SL is the definitive premium 2-in-1 sauna heating solution.

At Home of Clay we are proud stockists of Harvia, one of the world's most respected sauna manufacturers. Please note that stones are not included -- 40kg of 10 to 15cm stones must be ordered separately.

Key features

• Premium stainless steel outer casing -- The Pro 20 Duo SL's high-quality stainless steel outer casing sets it apart from the standard Pro 20 SL, providing exceptional durability, resistance to the constant thermal cycling of regular sauna use and a premium aesthetic that reflects the quality of the engineering within.
• 2-in-1 sauna heater and through-wall fireplace -- The Pro 20 Duo SL heats the sauna from within whilst the glass-fronted firebox extends through the wall into the adjacent room, creating a sauna heater and a genuine fireplace experience simultaneously. Heat your sauna to bathing temperature and enjoy the fireplace atmosphere at the same time -- then relax in the fireplace room after the sauna, cook over the fire and enjoy the afterheat before heading back in.
• Impressive large glass door with robust frame -- The Pro 20 Duo SL's large glass door with its impressive robust frame creates a striking fireplace effect in the adjacent room, providing a beautiful and atmospheric view of the fire that transforms the space around it.
• Robust 10mm steel fire chamber cover -- The heavy-duty 10mm steel fire chamber cover provides exceptional durability and heat resistance, contributing to the long operational lifespan of the heater and reflecting the premium engineering specification of the Duo SL throughout.
• Loaded from the adjacent room -- no cordwood in the sauna -- The through-wall design means firewood is loaded entirely from the adjacent room, keeping all wood and ash debris outside the sauna space and maintaining a clean, serene bathing environment throughout the session.
• Powerful 24.1kW output for sauna rooms of 8 to 20 cubic metres -- With a 24.1kW output the Pro 20 Duo SL is a high-performance heater well matched to medium-sized sauna installations, delivering reliable and consistent heat throughout even extended bathing sessions.
• 40kg stone capacity for authentic steam -- The generous stone compartment produces authentic and plentiful steam when water is poured over the stones, ensuring a thoroughly satisfying Finnish sauna bath experience alongside the fireplace atmosphere in the adjacent room.
• Top and rear flue connection via 115mm outlet -- The Pro 20 Duo SL accommodates both top and rear 115mm flue connections, providing flexibility in chimney configuration to suit different building layouts.
• CE and EAC certified -- designed, engineered and handmade in Finland -- Every Harvia Pro 20 Duo SL is designed, engineered and handmade in Finland to Harvia's exacting standards of quality and craftsmanship, carrying CE and EAC certification for complete peace of mind.

Pro 20 SL vs Pro 20 Duo SL -- what is the difference?

Both the Pro 20 SL and the Pro 20 Duo SL share the same 24.1kW output, 40kg stone capacity and through-wall 2-in-1 function. The key difference is the outer casing -- the standard Pro 20 SL uses a black steel frame, whilst the Pro 20 Duo SL features a premium high-quality stainless steel outer casing that provides superior durability, a more refined aesthetic and greater resistance to the thermal cycling demands of regular intensive sauna use. The Duo SL also features a more impressive large glass door with a robust frame and a 10mm steel fire chamber cover, making it the more premium and comprehensively specified of the two models.

For those who want the finest possible 2-in-1 sauna heater and fireplace experience with premium materials and engineering throughout, the Pro 20 Duo SL is the natural choice. For those seeking the same core functionality at a lower price point, the standard Pro 20 SL remains an outstanding option.

Why choose the Harvia Pro 20 Duo SL?

The Pro 20 Duo SL is the ultimate expression of the social sauna concept. The ability to heat the sauna and create a genuine fireplace atmosphere in the adjacent room simultaneously transforms the experience of home sauna ownership -- the sauna session becomes part of a wider social ritual rather than a solitary wellness routine. Cooking over the fire, warming by the flames after the sauna, enjoying refreshments in the fireplace room before heading back in -- the Pro 20 Duo SL creates a lifestyle around the sauna that is deeply rooted in Finnish culture and endlessly enjoyable in practice.

The premium stainless steel casing is not merely an aesthetic upgrade -- it is a meaningful engineering improvement that ensures the Pro 20 Duo SL will perform reliably and look exceptional for many years of intensive use. Combined with the 10mm steel fire chamber cover, the robust glass door frame and Harvia's world-class wood-burning technology, the Duo SL is built to the standard that the finest home sauna installations demand. For those who want the best, the Harvia Pro 20 Duo SL is the definitive choice.

Technical specification

Delivery and ordering

The Harvia Pro 20 Duo SL Wood Burning Sauna Heater is delivered to UK mainland addresses for a flat delivery charge of £50. Delivery is approximately 4 to 8 weeks, subject to availability. Please note that additional surcharges apply to the following areas -- Scottish Highlands and Islands and postcodes AB, IV, KW, HS, ZE, BT, IM, TR21, TR22, TR23, TR24, TR25, JE and GY. Please contact us before ordering if your delivery address falls within these areas to confirm applicable charges.

Please note that sauna stones are not included and must be ordered separately -- 40kg of 10 to 15cm stones are required. For further information or to discuss this product please call us on 01782 617517 or email sales@homeofclay.co.uk. Our team is happy to assist with any questions about the Harvia Pro 20 Duo SL and compatible accessories.