By Eric Moshier – Certified Heater Mason, Third-Generation Mason, MHA Technical Committee Member, ASTM E1602 Masonry Heater Group Member
The kakelugn is the Swedish tiled masonry heater: a tall, tile-faced radiant heat storage appliance perfected in Sweden in 1767 and still one of the most efficient wood-burning heaters ever built. The word joins the Swedish kakel (tile) and ugn (stove or oven), and it describes a heavy masonry core, threaded with long internal smoke channels and wrapped in glazed ceramic tile, that captures the heat of a short, hot fire and radiates it gently for 12 to 24 hours. Its story runs from medieval pot-tile stoves carried north by German and Hanseatic craftsmen, through the 1767 reform by the architect Carl Johan Cronstedt and the statesman Fabian Wrede, to the great 18th-century stoves of the Marieberg and Rorstrand factories and the provincial craftsman stoves of the 1800s. Solid Rock Masonry LLC of Duluth, Minnesota, led by Certified Heater Mason Eric Moshier, builds and restores heaters in this same Scandinavian tradition. This page traces that history in full, from the first tiled stoves of the Alps to the kakelugn revival of today.
What is a kakelugn?
A kakelugn is a masonry heater faced in glazed ceramic tile. Inside the tile skin is a dense masonry mass built around a compact firebox, and running up through that mass is a network of narrow smoke channels, or flues. You burn a short, hot fire, and the masonry absorbs the heat. Long after the flames are out, the warm tile surface releases that stored heat into the room slowly and evenly.
That is the defining idea of every masonry heater: heat is stored, not blasted. A kakelugn is not a stove you feed all day. You fire it hard for 2 to 3 hours, close it down, and let the masonry carry the room for the rest of the day and into the night. The glazed tile is not just decoration. It is a durable, cleanable radiating surface that has signaled craftsmanship and status for more than five centuries.
The kakelugn is the Swedish branch of a much larger European family of tile masonry heaters that includes the German and Austrian kachelofen. To understand the modern appliance the kakelugn became, see our overview of what a masonry heater is.
Where does the tile stove come from?
The tiled stove was not invented in Sweden. It was invented in the North-Alpine heart of Europe, in the region where Alsace, southwestern Germany, and northwestern Switzerland meet, sometime between the 8th and 10th centuries. The oldest examples archaeologists have identified as tiled stoves include a 9th-century stove at the monastery of Andlau in Alsace and a 10th-century stove at Lausen in northwestern Switzerland. From there the technology spread outward for the next thousand years, and the German-speaking lands remained its center.
The name itself records the original form. Kakel, like the German Kachel, descends from the Latin caccabus, meaning a pot or beaker. The earliest tiled stoves were not built of flat panels at all. They were built of dozens of pot-shaped ceramic vessels set mouth-outward into a clay body, their hollow bellies buried in the mass. Those buried bellies vastly increased the hot ceramic surface radiating into the room, so the stove heated up faster and burned far less wood than an open fire.
The genius of the tiled stove was that it heated a room without filling it with smoke. It was fired from an adjacent room, usually the kitchen, so the living room, the stube, stayed clean and warm. That single fact reshaped the European house, and it is the reason the tiled stove was prized by the people who could afford it: kings, nobles, monasteries, and wealthy townsmen.
How the stove tile evolved
The tile itself went through a long evolution that any student of the kakelugn should know. The earliest tiles, from roughly the 11th to the 13th centuries, were simple thrown vessels: beakers, cups, and pots, set into the clay with their mouths facing the room. Over the 13th and 14th centuries the mouths widened into dishes and bowls.
The decisive change came in the second quarter of the 14th century. Potters turned the vessel effectively inside out, presenting a flat clay face to the room with the hollow chamber behind it, and then pressed that face into a carved mould. For the first time the heating surface could carry a modeled picture. The flat relief tile, or Blattkachel, turned what one scholar called an unimposing box of heating into a piece of decorative furniture, used almost like wallpaper to display the owner’s taste, faith, or politics.
From the relief tile came the late Gothic column stove, the tall German-lands form from which the Swedish kakelugn ultimately descends. These stoves were most often glazed green over a white slip, and their tiles carried coats of arms, biblical scenes, knightly tournaments, and the tracery of the age. The first scholarly study of these tiles was written by a Swede, Sune Ambrosiani, whose 1910 typology of the older stove tiles remains the foundation of the field.
How did the tile stove reach Sweden?
Tile stoves reached southern Scandinavia in the 12th century and spread through Scania and southern Sweden across the 14th century. The earliest tile known in Scandinavia comes from the Danish monastery of Soro and dates to the 13th century. The carrier was trade. The German Hanseatic League ran a dense network of commerce across the Baltic, and the records show that trade with Scania and Sweden, with Stockholm foremost, far outweighed trade with the western Danish islands.
The first adopters in the North were the same classes who had adopted the stove everywhere else: the crown, the aristocracy, the church, and prosperous merchants. A tiled stove was expensive, it required a solid foundation and a rebuilt wall, and it announced that its owner had money, foreign connections, and taste. By the 16th century, German-named potters were making stove tiles in Stockholm itself, and German masters were hired to build stoves for the castles of Turku and Hame in Finland.
The smoke-free room and the Little Ice Age
The tiled stove did more than warm a room. It changed the shape of the home. Because it burned cleanly and was fed from the next room over, it made it possible to divide a house into many small, separately heated, smoke-free rooms rather than one large hall gathered around an open fire. In the German lands this produced a standardized plan of heated parlor, kitchen, corridor, and chambers that slowly spread north.
The timing was not an accident. As Europe slid from the Medieval Warm Period into the Little Ice Age between roughly 1400 and 1700, winters grew harder and firewood grew more precious. Building records from the period show windows shrinking and fireplace openings narrowing as households tried to hold heat and save fuel. The tiled stove, efficient and smokeless, was exactly the technology a cooling, wood-conscious Europe needed, and its spread accelerated. Sweden, cold and increasingly short of wood, was fertile ground for it.
What fuel crisis led to the modern kakelugn?
By the 1600s and 1700s Sweden was running short of wood. The country’s wealth rested on iron, and smelting iron demanded enormous quantities of charcoal. Add the timber consumed by construction, shipbuilding, and ordinary household heating, and the forests near the mining and iron districts were being cut faster than they could regrow.
Firewood grew expensive and scarce, and heating a home through a Swedish winter on an open fireplace or a leaky iron stove was a real hardship. Ordinary stoves and hearths sent most of their heat straight up the chimney with the smoke. The problem was serious enough to reach the highest levels of the Swedish state, which turned to the Royal Swedish Academy of Sciences for a solution. Sweden needed a stove that could heat a home on a fraction of the wood.
Who invented the kakelugn in 1767?
The answer came in 1767. Working under the Royal Swedish Academy of Sciences, the architect Carl Johan Cronstedt and the statesman and officer Fabian Wrede presented a redesigned tiled stove built around a multi-channel flue system, published under the motto “Til veds besparing” – “for the saving of wood.”
Their innovation was simple and profound. Instead of letting the hot flue gases rush straight up the chimney, Cronstedt and Wrede routed them through a series of tall, switchback smoke channels built into the masonry mass, commonly five vertical passes. The gases were forced to travel a long, winding path, giving up nearly all of their heat to the masonry before they ever reached the chimney. A short, fierce fire now warmed the stove instead of the sky.
This 1767 multi-channel kakelugn is the direct ancestor of every efficient Swedish tiled stove built since, and the principle has not changed in more than 250 years. It is the same principle engineered into the Solid Rock Masonry SR Core system today.
How does a kakelugn work?
A kakelugn is a true heat-storage appliance. You burn a small, intense fire of dry wood for 2 to 3 hours in a compact firebox. Because the fire is hot and well supplied with air, combustion is nearly complete, which is also why a well-built kakelugn produces very little smoke and very little creosote.
As the fire burns, the hot gases wind up and down through the internal channels. In a large stove they travel roughly ten meters of switchback flue before reaching the chimney, and along that path the masonry soaks up their heat. Once the fire is out and the dampers are closed, the tile surface releases that stored warmth slowly and evenly, typically for 12 to 24 hours.
Size sets the rhythm. A large kakelugn with five flue passes can hold and release heat for the better part of a day after a single firing, while a small two-pass stove might warm a room for four or five hours. This is radiant heat storage, and it is why a masonry heater feels so different from a metal stove. The output is gentle and long, not fierce and brief.
For the comfort and efficiency numbers behind this, see Are Masonry Heaters Worth It, and to size a heater to your own home use the free heat loss calculator at LoadCalc.net.
The golden age: Marieberg, Rorstrand, and the Gustavian stove
Once the efficient stove existed, the tile became the art, and the late 18th century became the golden age of the Swedish kakelugn. The most celebrated stoves of the period came from the Marieberg factory on Kungsholmen in Stockholm, which operated from 1758 to 1788. Marieberg was famous above all for its faience, but it began building tiled stoves in 1767, the very year of the invention, and its stoves were made to the same exacting standard as its finest tableware.
A genuine Marieberg stove can still be recognized by its craftsmanship. Marieberg used a yellow-firing clay when nearly everyone else, including the early Rorstrand factory, used red-firing clay. Over that pale body it laid a very thick, glossy, pearl-gray tin glaze about a millimeter deep, where ordinary stoves of the day carried a glaze only a fifth as thick. The tile bodies themselves were thin and finely made. About ninety Marieberg stoves survive today, most of them standing in manor houses and castles around Sweden. Sturehov Castle, home of the factory’s owner Johan Liljencrantz, holds no fewer than twenty of them.
In 1782 Marieberg was bought out by its larger rival, the Rorstrand factory, and in 1788 the Marieberg works closed. Rorstrand had already mastered the full palette of high-fire colors. Where the earliest painted stoves used only cobalt blue on a white tin glaze, by 1758 Rorstrand commanded the complete range of strong-fire colors: green, yellow, blue, and brown-violet. A polychrome stove is recorded in the accounts of Stockholm Castle as early as 1763.
The style of the stove changed with the fashion of the age. When the Rococo arrived in the mid-1700s, tile sizes standardized, the tall round or cylindrical stove was introduced alongside the older columnar form on its cube-shaped base, and stoves were painted with the light, decorative patterns of the day, many copied from European faience. Through the Rococo and the Gustavian periods that followed, the kakelugn became a fixture of Swedish life at every level of society, from hand-painted showpieces in the great houses to plainer stoves in ordinary homes.
The craftsman stoves: hantverksugnar of the 1800s
Alongside the grand factory stoves ran a humbler and equally important tradition: the hantverksugn, the craftsman-made provincial stove. From roughly 1790 to 1860, and most beautifully in the Empire or Karl Johan style of about 1830 to 1850, local potters and masons across the Swedish provinces built tiled stoves by hand for farmhouses, parsonages, and coaching inns.
These stoves tell their origins in their materials. They were built of local iron-rich red clay, which fired to a red body, and the potter applied a slip, or engobe, to achieve a color such as green. Two glaze techniques became the signature of the provincial stove: the splashed glaze, which gave the stankugn or splash stove its speckled coat, and the running glaze, which let color flow down the tile. Regional schools grew up in Halsingland, Varmland, Ostergotland, Sodermanland, Halland, and the iron districts, each with its own character. Collectors today regard the best of them as a national treasure.
The construction was the same one masons still use. The internal channels were built in the standard five-pass layout that dates to about 1800. Each tile was fitted individually to its neighbors, so a stove taken apart for restoration must have every tile labeled before it comes down. The hollow back of each tile was packed with clay mortar and brick. Early stoves had large open fireboxes, often with no doors at all, which gave radiant heat and light and let the household cook at the fire; doors, when fitted, were hand-forged black sheet iron.
The kakelugn and the wider world of stoves
The kakelugn never stood alone. It is the Swedish member of a European family that runs from the Swiss and German kachelofen through the Austrian, Czech, Hungarian, and Baltic tile stoves. All of them share the same ancestry in the medieval pot-tile stove, and all of them advanced together. The Swiss potters of the 15th and 16th centuries developed the first white faience glazes for stove tiles, influenced by Italian majolica, and dated pieces such as the 1518 stove at Holligen Castle near Bern mark the arrival of fine blue-painted faience.
As iron founding grew after 1500, combined stoves appeared with a cast-iron base and tiled upper body. By the 19th century the craft was industrializing, with large firms turning out many thousands of stoves a year and dedicated stove-making schools appearing. The kakelugn was one branch of a craft that stretched across the whole of central and northern Europe.
Solid Rock Masonry works in this same living tradition. Read more about the timeless tradition of the kachelofen, the German and Austrian cousin of the kakelugn.
Decline and revival
The kakelugn’s long reign faltered in the early 20th century. Central heating, electricity, and cheap fossil fuel made a wood-fired tile stove look old-fashioned, and through the middle decades of the century many thousands of kakelugns were torn out, bricked up, or abandoned. A great deal of 18th- and 19th-century craftsmanship was lost.
The revival began late in the 20th century and has only grown. Rising energy costs, a renewed appreciation for clean and efficient wood heat, and the strong Swedish building-conservation movement, byggnadsvard, brought the kakelugn back into favor. Antique stoves are now sought out, restored, and reinstalled, and the craft of building new ones has been kept alive by a small number of masons on both sides of the Atlantic. What was nearly discarded is again understood as one of the best heating ideas the age of wood ever produced.
One of the finest collections outside Sweden stands in Minnesota. The Turnblad Mansion in Minneapolis, now the American Swedish Institute, holds eleven antique Swedish kakelugns ordered from the Rorstrand and Uppsala Ekeby catalogs around 1900.Solid Rock Masonry is part of that living tradition. See our restoration work and our gallery.
Why the kakelugn still matters today
Everything that made the kakelugn revolutionary in 1767 still matters now. It burns a small amount of wood cleanly and completely, stores the heat in masonry, and releases it slowly and comfortably over many hours. That is exactly what a modern homeowner wants from wood heat: warmth, low emissions, and very little fuel.
Today’s masonry heaters refine the same idea with engineered fireboxes and cores such as our SR Core system, but the physics are unchanged from Cronstedt and Wrede’s design. For anyone who wants efficient, low-emission wood heat with the beauty of a tile stove, the kakelugn tradition is very much alive. Explore our custom masonry heaters and Tulikivi soapstone radiant fireplaces, add a wood-fired bake oven, commission handmade heater doors, or learn the craft at a masonry heater and oven workshop.
Frequently Asked Questions About the Kakelugn
What is a kakelugn?
A kakelugn is a Swedish tiled masonry heater. A heavy masonry core is built around a small firebox, threaded with internal smoke channels, and faced with glazed ceramic tile. A short, hot fire heats the masonry, which then radiates gentle warmth for many hours. “Kakelugn” means “tile stove” in Swedish.
When was the kakelugn invented?
The efficient modern kakelugn was presented in 1767. Tile stoves themselves are far older, reaching Sweden by way of German and Hanseatic trade from the 14th century, but 1767 is when the fuel-saving multi-channel design was introduced.
Who invented the kakelugn?
The 1767 design was the work of the architect Carl Johan Cronstedt and the statesman Fabian Wrede, working under the Royal Swedish Academy of Sciences. Their multi-channel flue system was published under the motto “Til veds besparing,” for the saving of wood.
How does a kakelugn work?
You burn a short, hot fire for 2 to 3 hours. The hot gases wind through a system of internal masonry channels, giving up their heat to the mass before reaching the chimney. The tile surface then radiates that stored heat into the room for 12 to 24 hours.
What is a Marieberg kakelugn?
Marieberg was a Stockholm factory that operated from 1758 to 1788 and built tiled stoves from 1767. Its stoves are prized for a yellow-firing clay body under a thick, glossy pearl-gray tin glaze. About ninety survive, twenty of them at Sturehov Castle.
How is a kakelugn different from a kachelofen?
They are close cousins in the same European family of tile masonry heaters. Kakelugn is the Swedish term; kachelofen is the German and Austrian term. Both store heat in masonry and face it in ceramic tile. The Swedish kakelugn is defined by the efficient 1767 multi-channel design.
Are kakelugns still made today?
Yes. Antique kakelugns are restored and reinstalled across Sweden, and new masonry heaters are built on the same 1767 principle worldwide. Solid Rock Masonry builds custom tiled stoves and masonry heaters, and restores antique ones, from Duluth, Minnesota.
Can I get a kakelugn in the United States?
Yes. Solid Rock Masonry designs and builds custom masonry heaters and Scandinavian-style tile stoves nationwide, and offers the SR Core kit system for owner-builders. Contact us to talk through a project.
Contact Solid Rock Masonry
Interested in a Swedish-style tiled stove, a modern masonry heater built on the 1767 principle, or the restoration of an antique kakelugn? Solid Rock Masonry LLC builds custom heaters nationwide and ships the SR Core kit system across North America.
Solid Rock Masonry LLC
5347 Howard Gnesen Road, Duluth, MN 55803
Phone: 218-343-2978
Email: eric@solidrockmasonry.com
Web: www.solidrockmasonry.com