NunnaUuni Oy
NunnaUuni Oy is a Finnish family-owned manufacturer of premium heat-storing soapstone fireplaces, baking ovens, and wood stoves, serving residential homeowners and cottage owners across Finland and Central Europe through an authorized dealer network and proprietary Mammutti soapstone and Kultainen Tuli combustion technology.
- Company typePrivate
- Founded1982
- HeadquartersNunnanlahti, Finland
- Headcount11–50
- GTM typeB2C
- OfferingHardware or Manufacturing
What NunnaUuni Oy does
NunnaUuni Oy is a Finnish family-owned manufacturer of premium heat-storing soapstone fireplaces, baking ovens, and wood stoves, headquartered in Nunnanlahti, Juuka, North Karelia. Founded in 1982 (parent Nunnanlahden Uuni Oy) and incorporated as a separate operating subsidiary in 2007, the company controls the entire vertical stack from its own Mammutti-vuolukivi (Mammutti soapstone) quarry through in-house manufacturing, with a 15-person headcount and a 91% business self-sufficiency ratio. The core technology rests on two proprietary assets: (i) Mammutti soapstone, a magnesite-bearing stone sourced exclusively from the company's own quarry and capable of withstanding firebox temperatures above 600°C while storing 71.6 kWh in the flagship Blanka model (vs. competitors' 22–44 kWh), and (ii) the patented Kultainen Tuli (Golden Fire) gasification combustion method, which reduces particle emissions by up to 90% versus traditional grates. Supporting IP includes Patent no. 122079 covering the Injektorivaraaja injector heat-storage unit, plus a portfolio of structural innovations (Solo-takkaleivinuuni, Aqua+ water heat exchanger).
The company monetizes primarily through one-time sales of high-priced units (€2,500–€50,000 ticket size) to residential homeowners and cottage owners, distributed via an authorized dealer network across Finland and export distributors in Central Europe (over 50% of production exported). A secondary revenue stream is consumer financing (NunnaUuni Rahoitus), offered at OP-prime + 6.95%. Marketing is content-led, with an active blog, multilingual website (8 European languages), and organic social channels rather than paid acquisition. The customer base is fragmented — individual households, interior designers, and architectural projects — with no enterprise concentration. In 2022, CEO Johannes Uusitalo acquired a majority stake from the parent, and the company has since launched four new products (Anna baking oven 2022, Aqua+ 2024, Anni wood stove 2024, Deko 2 Due 2025), with the Anna model being the world's first heat-storing fireplace to meet EcoDesign emission limits.
NunnaUuni Oy firmographics
Firmographics- Name
- NunnaUuni Oy
- Legal name
- NunnaUuni Oy
- Website
- https://nunnauuni.fi
- Company type
- Private
- Founded year
- 1982
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- NunnaUuni Oy is a Finnish family-owned manufacturer of premium heat-storing soapstone fireplaces, baking ovens, and wood stoves, serving residential homeowners and cottage owners across Finland and Central Europe through an authorized dealer network and proprietary Mammutti soapstone and Kultainen Tuli combustion technology.
- Ownership category
- akta.pro rank
NunnaUuni Oy industry classification
Industry- Product category
- Heat-Storing Soapstone Fireplaces
- NAICS
- Heating Equipment (except Warm Air Furnaces) Manufacturing (333414), Ventilation, Heating, Air-Conditioning, and Commercial Refrigeration Equipment Manufacturing (3334)
- SIC
- Heating Equip, Except Elec & Warm Air; & Plumbing Fixtures (3430), Heating Equipment, Except Electric & Warm Air Furnaces (3433)
- akta.pro primary industry
- Boilers, Furnaces & Process Heating Equipment (IMAHAKAD)
- akta.pro secondary industry
- Heat Transfer Equipment (Heat Exchangers, Boilers, Condensers) (IMAHAEAC)
Keywords
Where NunnaUuni Oy is headquartered
LocationHeadquarters
- HQ city
- Nunnanlahti
- HQ country
- Finland
- HQ region
- Europe
Offices1 record
Markets served
NunnaUuni Oy business model
Business model- GTM type
- B2C
- Offering type
- Hardware or Manufacturing
- Cost components
- Supply Chain, Personnel, Operations, Marketing or Sales, Technology or R&D
Revenue model
- Fireplace and fireplace-stove product sales: NunnaUuni generates revenue primarily from the manufacture and sale of soapstone fireplaces, baking ovens, cooktops, and stoves. Products are sold through an authorized dealer network in Finland and through export to Central European markets.
- Financing services: The company offers NunnaUuni Financing to customers, enabling installment purchases of fireplaces. Financing ranges from €2,500 to €50,000 with interest rate of OP-prime + 6.95% and a €7/month billing fee.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Other | Monthly | NunnaUuni Financing – installment payment plan |
Go-to-market motion1 record
Distribution channels1 record
Marketing channels7 records
NunnaUuni Oy product offering
Product offeringCore offering
NunnaUuni Oy designs and manufactures premium full-mass heat-storing soapstone fireplaces, baking ovens, and wood stoves made from its proprietary Mammutti soapstone, sourced from the company's own quarry in Nunnanlahti, Finland. Products use the patented Kultainen Tuli (Golden Fire) gasification combustion technology to deliver up to 48+ hours of heat from a single firing with particle emissions reduced to one-tenth versus traditional fireplaces. The lineup includes core fireplace models (Blanka, Gratia, Joya, Latus, Vega), the EcoDesign-compliant Anna baking oven, Hestia Solo fireplace-baking ovens, Calor injector fireplaces (Patent no. 122079), Anni wood stoves, Deko lightweight cottage stoves, and the Aqua+ water heat exchanger add-on.
Product overview
NunnaUuni Oy is a Finnish family-owned manufacturer of heat-storing soapstone fireplaces and baking ovens based in Nunnanlahti, North Karelia. The core product portfolio centers on full-soapstone heat-storing fireplaces (varaavat takat) made from proprietary Mammutti soapstone, including models such as Blanka, Gratia, Joya, Latus, Vega, and Hestia. The company also produces baking oven models (leivinuunit) like the Anna and Hestia Solo series, which combine traditional baking oven functionality with modern EcoDesign-compliant clean-burning technology. Supporting products include lightweight Deko stoves for cottages, Calor injector fireplaces with patent-protected technology, Anni wood stoves with cooking capability, and the Aqua+ water circulation heat exchanger for integrating fireplaces with water-based heating systems. The company also offers decorative soapstone tiles (vuolukivilaatat) for interior applications. NunnaUuni's key technological differentiator is the patented Kultainen Tuli (Golden Fire) gasification combustion method combined with Mammutti soapstone's heat retention properties, enabling heat output of 48+ hours from a single heating cycle and emissions reductions of up to 90% compared to traditional fireplaces.
Differentiator
Problem solved
Functional benefit
Brands
- Kultainen Tuli: Patented clean combustion technology (gasification combustion method) that enables efficient and clean burning with significantly reduced particle emissions.
- Mammutti-vuolukivi
- Aqua+
Products and services
- Varaava Takka (Heat-Storing Fireplace) Full-soapstone heat-storing fireplaces made from Mammutti soapstone that deliver long-lasting radiant heat for 48+ hours from a single heating cycle, for residential homeowners seeking quality, durable, and renewable-wood heating.
- Anna Leivinuuni (Baking Oven) Heat-storing baking oven that combines traditional Karelian-pastry, roasting, and slow-cooking capability with EcoDesign-compliant clean-burning technology, for homeowners who want both heating and traditional cooking in one appliance.
- Deko-kamiina (Lightweight Stove) Lightweight Mammutti soapstone double-shell stoves for cottages and smaller spaces where a full fireplace is too large, delivering fast heat and up to 10 hours of heat retention.
- Calor-takat (Injector Fireplaces) Heat-storing fireplaces built around the patented Injektorivaraaja (Injector heat storage) Mammutti soapstone technology for lightweight yet genuine long-duration heat storage, in models including Calor Hexa, Calor Rondo, Calor Quadra, and Calor Ellipse.
- Anni Puuhella (Heat-Storing Wood Stove) Modern heat-storing wood stove with a ceramic cooktop, wide glass door for fire viewing, and Golden Fire clean-burning grate; the only type-approved heat-storing wood stove meeting EcoDesign limits per EN15250.
- Hestia Solo Takkaleivinuuni (Fireplace-Baking Oven) Combined fireplace and baking oven featuring the unique Solo structure that heats the baking oven from below while keeping it ash-free, available in corner, single-sided, and tunnel configurations with ceramic finishes.
- Hestia Solo 180 (Double-Sided Fireplace) Double-sided Hestia Solo fireplace-baking oven with the firebox and baking oven doors on opposite sides, designed to function as a room divider while providing fire views from both rooms.
- Blanka Fireplace Premium heat-storing fireplace with 71.6 kWh heat storage capacity, available with ceramic tile finishes and in corner and tunnel configurations.
- Gratia Fireplace Compact heat-storing fireplace with 35.8 kWh heat storage capacity and ceramic finish options, NunnaUuni's smallest full-mass soapstone model.
- NunnaUuni Aqua+ Heat Exchanger Heat exchanger that integrates NunnaUuni fireplaces with a home's water-based heating system or solely for domestic hot water production, transferable 5–10 kWh of thermal energy to water.
- Vuolukivilaatat (Soapstone Tiles) Decorative Mammutti soapstone tiles for interior design and bathroom applications, valued for durability and ease of maintenance in wet areas.
- NunnaUuni Rahoitus (Installment Financing) Installment financing service enabling customers to purchase NunnaUuni fireplaces with loans from €2,500 to €50,000, one interest-free month, and flexible early repayment.
Quantifiable outcome
- Blanka model stores 71.6 kWh vs. competitors' 22–44 kWh – nearly double the heat storage of same-sized competitors.
- +4 more outcomes
Companies that use NunnaUuni Oy
Customer profileNamed customers3 records
Segments3 records
Ideal customer profiles3 records
NunnaUuni Oy technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature5 records
NunnaUuni Oy partnerships and signals
Strategic signalPartnerships
Two partnerships are on record, tiered core and minor.
- Nunnanlahden Uuni OycoreNunnanlahden Uuni Oy is the parent company and founding entity of NunnaUuni Oy. The company owns the quarry in Nunnanlahti and manufactures fireplace products. NunnaUuni Oy was established in 2007 as a subsidiary for fireplace manufacturing, marketing, and sales. Nunnanlahden Uuni Oy and NunnaUuni Oy share the same customer register. Liiketoiminnan omavaraisuusaste (self-sufficiency ratio) is 91%.
- KontiominorFinnish log house builder. Mentioned in the context of a customer's dream cottage project where a custom NunnaUuni fireplace was installed in a Kontio log house at Mikkeli. The relationship appears to be a case study reference rather than an official partnership.
Scale indicators5 records
Recent moves6 records
Expansion highlights5 records
NunnaUuni Oy competitors and assessment
Company assessmentDirect peers
- MCZ Group: Italian producer of pellet stoves, wood stoves, and fireplaces with a pan-European footprint. Direct competitor in the Central European premium market, with similar technology and distribution profiles.
- Tulikivi: Finland's largest soapstone fireplace manufacturer, also using soapstone as a primary material. Tulikivi is the most direct comparable to NunnaUuni in terms of material, geography, and product category, and is publicly listed, providing a benchmark for category economics.
- Spartherm: German premium fireplace manufacturer with a broad portfolio of heat-storing and fireplace products. Spartherm is a primary competitor in NunnaUuni's main Central European export markets and competes on clean-combustion performance and design.
- Contura: Swedish wood stove manufacturer with strong Nordic brand recognition. Compares to NunnaUuni on regional positioning, heat-storing technology, and residential heating use cases.
- Edilkamin: Italian manufacturer of wood-burning fireplaces, stoves, and heating products with significant European distribution. Comparable to NunnaUuni in product category and export orientation, though broader in product mix.
- Stuv: Belgian premium fireplace and stove manufacturer focused on design-led, high-efficiency wood-burning appliances. Compares to NunnaUuni on premium positioning and Central European dealer channels.
Broad incumbents
- Jøtul: Norwegian heritage cast-iron stove and fireplace manufacturer with global brand recognition. Broader incumbent serving overlapping residential heating customers, particularly in Nordic and Central European markets.
- HearthStone Quality Home Heating Products: US-based manufacturer of soapstone and cast-iron stoves. Uses soapstone as a key material like NunnaUuni, but serves the North American market; useful as a material-similarity comparator.
Emerging players
- Traforart: Spanish manufacturer of designer fireplaces and wood-burning stoves with a strong European design presence. Comparable to NunnaUuni on premium positioning and design-led product strategy, but with a different material base.
- Woodstock Soapstone Company: Family-owned US soapstone stove and fireplace manufacturer. Comparable in size, family-business character, and soapstone-centric product strategy, though smaller scale and North America-focused.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat5 records
Key risks7 records
Key highlights7 records
Customer concentration
NunnaUuni Oy social profiles
Digital presenceNunnaUuni Oy financial estimates
Financial estimateRevenue estimate
Valuation estimate
NunnaUuni Oy leadership team
Management profileNumber of profiles
Profiles1 record
NunnaUuni Oy subsidiaries and ownership
Company hierarchySubsidiaries1 record
NunnaUuni Oy funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
NunnaUuni Oy M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about NunnaUuni Oy
What does NunnaUuni Oy do?
NunnaUuni Oy designs and manufactures premium full-mass heat-storing soapstone fireplaces, baking ovens, and wood stoves made from its proprietary Mammutti soapstone, sourced from the company's own quarry in Nunnanlahti, Finland. Products use the patented Kultainen Tuli (Golden Fire) gasification combustion technology to deliver up to 48+ hours of heat from a single firing with particle emissions reduced to one-tenth versus traditional fireplaces. The lineup includes core fireplace models (Blanka, Gratia, Joya, Latus, Vega), the EcoDesign-compliant Anna baking oven, Hestia Solo fireplace-baking ovens, Calor injector fireplaces (Patent no. 122079), Anni wood stoves, Deko lightweight cottage stoves, and the Aqua+ water heat exchanger add-on.
Is NunnaUuni Oy a public or private company?
NunnaUuni Oy is a private company. It is classified as family owned and is currently operating.
When was NunnaUuni Oy founded?
NunnaUuni Oy was founded in 1982. It employs 11 to 50 people.
Where is NunnaUuni Oy based?
NunnaUuni Oy is headquartered in Nunnanlahti, Finland, in the Europe region.
How does NunnaUuni Oy make money?
Two revenue lines are on record. Fireplace and fireplace-stove product sales are the primary driver. The others are financing services.
Who are NunnaUuni Oy's main competitors?
Direct peers on record are MCZ Group, Tulikivi, Spartherm, Contura, Edilkamin and Stuv. Broad incumbents are Jøtul and HearthStone Quality Home Heating Products. Emerging players are Traforart and Woodstock Soapstone Company.
Does NunnaUuni Oy have an API?
No public API is recorded for NunnaUuni Oy.
What industry is NunnaUuni Oy in?
NunnaUuni Oy's product category is Heat-Storing Soapstone Fireplaces. Its primary akta.pro industry code is IMAHAKAD, Boilers, Furnaces & Process Heating Equipment, with a secondary code of IMAHAEAC, Heat Transfer Equipment (Heat Exchangers, Boilers, Condensers). Its NAICS code is 333414 and its SIC code is 3430.