Northern winters have taught us to survive in harsh conditions. A fireplace has held a central place in this. It has been a focal point of the home, serving as a kitchen and a heat source. Even if a fireplace does not hold the same meaning to the modern man, the skill of constructing a fireplace has been maintained and developed in combination with the modern industrial expertise, research and design in each fireplace we manufacture

More than 100 years of fireplace expertise

The guild of the master fireplace builders lived in Nunnanlahti, Finland, in the 1800s. Once a suitable stone deposit had been located and quarried, the stone was sawn – perpendicular to the foliation for the inner fireplace stones, and parallel to the foliation for the surface stones.

Depending on their plane of cut, the stones were used to achieve different directions of heat transfer in the finished soapstone fireplace. Such soapstone fireplaces were famous for their excellent thermal properties, and the best of them for the strong, light brown, stable layer, which formed on the surfaces of the fire chamber after heavy use.

Fireplace masters started their work by selecting a fireproof soapstone type of the fire chamber. Their reputation as fireplace masters, both in their own village and in the neighbouring villages, depended on it. A fire chamber that lasted for decades, good baking properties of the baking oven and even heat release of the fireplace ensured that the master would continue to feed his family comfortably and well into the future.

And science proves it

Science has since proven what fireplace masters already knew more than a century ago. The best material for the fire chamber, the most vital part of the fireplace, is type of soapstone consisting of fine-grained magnesite and a combination of schistose and foliated, flaky talc formed under intense geologic pressure.

This unique soapstone deposit*, which provides the perfect material for high temperatures of the fire chambers, was discovered by the father and grandfather of NunnaUuni founder Juhani Lehikoinen – both fireplace masters themselves. What they ingeniously realised was that the type of soapstone in this particular deposit was different from that found in all of the area’s numerous other deposits, which had become known for providing easily workable building material. This Mammutti soapstone deposit* and our experience-based skills in building soapstone fireplaces ensure that the fireplace building traditions of Nunnanlahti will stay alive and well long into the future.
Read more about the unique, modern NunnaUuni fireplaces.

* Name of mining concession: Nunnanlahti No. 3159

A firm foundation

The true comfort of warmth is based on a soapstone type that endures high heat, directly from NunnaUuni’s own soapstone deposit.

The Nunnanlahden Uuni Group has exclusive rights to a deposit of the durable Mammutti soapstone type (Mining concession: Nunnanlahti no. 3159). The good financial standing of our company is based on our knowledge of the Mammutti soapstone types in our unique soapstone deposit and the fact that we are able to use them in the structures of heat-storing fireplaces in the best possible way.

Selecting the right type of soapstone requires a high level of expertise: for this reason, we identify the types of stone already at the mine before the stone is removed. Every one of our fireplaces has been manufactured with great professional pride. As proof, we provide a NunnaUuni durability guarantee of five years for the stone parts and the thermal properties of all our products.

According to core samples, our mine in Nunnanlahti contains an estimated 29 million tonnes of the Mammutti soapstone type. The open-pit mine is 200 metres wide and 350 metres long.

NunnaUuni today

Juhani Lehikoinen, the owner of Nunnanlahden Uuni Oy, established the company in 1982. The same year saw the beginning of the industrial production of heat-storing soapstone fireplaces honouring the traditional craftsmanship of local fireplace masters.

Today, NunnaUuni Oy is Finland’s only manufacturer of heat-storing all-soapstone fireplaces. The fire chambers and heat-storing structures of all our heat-storing fireplaces are made of the soapstone type found in our own deposit, which we call the Mammutti soapstone.

The Nunnanlahden Uuni Group is a financially sound family company that is independent of external investors. The manufacturing, marketing and sales of fireplaces are the responsibility of its subsidiary NunnaUuni Oy, which was established in 2007. The group’s head office and production plants are located in Nunnanlahti, Juuka, in North Karelia, Finland. NunnaUuni fireplaces are sold by authorised dealers in a number of countries.