Narvi Black 20 Through-the-Wall Wood-Burning Sauna Heater

Narvi Black 20 Through-the-Wall Wood-Burning Sauna Heater provides power, precision, and refined Finnish craftsmanship.  

Offering robust performance, enduring quality, and timeless elegance, the Narvi Black 20 through-the wall sauna heater is a masterclass in engineering. Its large stone compartment ensures optimal heat retention and a long, consistent "löyly," while the generously sized fire grate spans the full base of the heater, maximising combustion efficiency. Secondary air is carefully directed beneath the ash pan, further enhancing burn performance for cleaner, more efficient heating. 

The firebox is built for durability, with a 10 mm-thick stainless steel roof capable of withstanding years of intense use. The glazed cast-iron door not only showcases the warm glow of the fire but also helps maintain a steady flame, adding ambience to the adjacent room. 

With adjustable legs for effortless installation and a through-the-wall configuration, the Narvi Black 20 is conveniently loaded from outside the sauna, keeping your sauna clean and uncluttered while adding warmth to the adjoining space. 

For those seeking both substantial heating capacity and elegant Nordic design, the Narvi Black 20 is a refined yet powerful choice.  

Please note that the flue kit and sauna stones are to be purchased separately

We recommend the Kota Insulated Steel Flue / Chimney Kit.

This heater requires 60kg of sauna stones. We recommend using 10-15cm Olivine Diabase or Vulcanite Sauna Stones for optimal performance.

Warranty

The warranty on this Narvi Sauna Heater is 2 years in private use.

About Narvi Oy

Browse our wider Narvi sauna heater collection. 

Product Disclaimers

All Narvi sauna heaters are CE tested and bear the Finnish Key Flag Symbol. This is awarded to sauna heaters that are made and designed in Finland, where over 95% or more of the production must be within Finland itself. There are many brands that claim to be made in Finland but are actually made in the Far East or Russia and merely assembled or labeled in Finland. Watch out for these symbols as a mark of an authentic, Finnish-made, safe, quality product:

As part of Finnmark Sauna's Endurance Ethos, we only deal in products that are market leaders in quality. We commit ourselves to search exhaustively for the highest quality authentic Finnish sauna products.

Please note, we recommend that sauna heaters should be installed by a suitably qualified builder/plumber/fitter. Finnmark Limited accepts no liability for loss or injury caused by the incorrect installation or misuse of your sauna heater. Please Contact Us if you require information on our recommended fitters.

Narvi Black 20 Through-the-Wall Technical Specification

*Top connection only