Kalvis

What Kalvis does

Kalvis (UAB \"Kalvis\") is a privately held Lithuanian manufacturer headquartered in Šiauliai that designs and builds solid fuel boilers and industrial heating equipment, alongside a metal processing subcontracting business. The domestic product line spans 6-70 kW units, including automatic pellet boilers (K-8 and K-2 series with licensed BurnPell X burners), manual-loading boilers (K-5, K-2), air heating stoves, boiler-cookers (K-4), and sauna boilers (K-PR). The industrial portfolio covers 70 kW to 5 MW systems across multiple proprietary architectures: K-series manual-loading boilers (95-1,250 kW), M1 moving-grate boilers (140 kW-4 MW), M2 wet-fuel boilers handling up to 55% moisture content (500-2,500 kW), M-series volcanic-fuel boilers for sawdust and chips up to 45% moisture (95-1,500 kW), MG-series automated pellet boilers (100-500 kW), and container-modular boiler houses for sites without suitable existing buildings. Technical differentiators include bottom-combustion efficiency (82%), Class 5 EN 303-5 certification, and Energy Efficiency Class A+ ratings on the K-2-30DG pellet boiler.

The company monetizes through a mix of hardware sales (boilers, spare parts) and professional services (consulting, design, installation, warranty, metal subcontracting). GTM combines a Kalvis-branded retail store in Šiauliai with an authorized dealer network across Lithuania (CELSIS, VILPRA, ERMITAŽAS, GAMUS, MOKI-VEŽI, ORESTINA, SIMEKS, DANRITA and others) for residential and small commercial customers, plus direct field sales and partnership-led distribution for industrial installations in 12 export markets: Estonia, Latvia, Belarus, Ukraine, the UK (via Verslo namai), Sweden, Finland, Denmark, France, Kenya, Norway, and Spain. Customer segments span residential homeowners (50-900 m² premises), societal and administrative buildings, and small-to-medium industrial facilities. Approximately 220 skilled workers support operations, making Kalvis one of Lithuania's largest metal processing companies, with ISO 9001/14001/45001 certifications underpinning quality, environmental, and safety processes. No AI/ML capabilities are evidenced; connectivity features (ecoNET internet module, ecoSTER thermostat, S.Control Touch MK2, Lambda probe) provide remote monitoring and combustion optimization but reflect IoT automation rather than machine learning.

Name

Kalvis

Legal name

UAB "Kalvis"

Website

https://kalvis.lt

Company type

Private

Founded year

2003

Operating status

Operating

Short description

Kalvis is a Lithuanian manufacturer of solid fuel boilers and industrial heating equipment (6 kW to 5 MW), serving residential, public-sector, and small-to-medium industrial customers across Lithuania and 12 export markets through a dealer network and direct industrial sales.

Ownership category

akta.pro rank

Product category

Industrial Heating Equipment

NAICS

Power Boiler and Heat Exchanger Manufacturing (33241), Heating Equipment (except Warm Air Furnaces) Manufacturing (333414)

SIC

Heating Equipment, Except Electric & Warm Air Furnaces (3433), Fabricated Plate Work (Boiler Shops) (3443)

akta.pro primary industry

Boilers, Furnaces & Process Heating Equipment (IMAHAKAD)

akta.pro secondary industries

Biomass Heating Systems (Commercial/Institutional Boilers) (EUAAAGAE), Biomass Combustion & Boiler Island Technology (Grates, Fluidized Bed, Burners) (EUAAAGAG), Heat Transfer Equipment (Heat Exchangers, Boilers, Condensers) (IMAHAEAC), Industrial Boilers, HRSGs & Steam Generators (IMAHAFAF)

Keywords

• Solid fuel boilers
• Industrial heating equipment
• Biomass boiler manufacturing
• Metal processing services
• Boiler house installation

Headquarters

HQ city

Siauliai

HQ country

Lithuania

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B and B2C

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Heating equipment sales: Sale of domestic solid fuel boilers (10-70 kW) and industrial boilers (70kW to 5MW) including manual and automated loading systems
2. Industrial boiler house installation: Installation and modernization of solid biofuel boiler-houses, commissioning, warranty and post-warranty repair services
3. Engineering and design services: Design of industrial boiler equipment, technological equipment, automation systems, container-modular boiler rooms, metal constructions
4. Spare parts: Sale of spare parts for heating equipment
5. Subcontracting/metal processing: Custom metal processing and industrial equipment manufacturing services

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels3 records

Core offering

Kalvis manufactures solid fuel boilers (domestic units from 10-70 kW and industrial boilers from 70 kW to 5 MW), air heating stoves, boiler-cookers, sauna boilers, container boiler houses, and boiler house equipment. The company also provides metal processing, custom industrial equipment manufacturing, and full-service boiler house design, installation, consulting, and warranty services.

Product overview

Kalvis is a Lithuanian heating equipment manufacturer offering two main product lines: domestic solid fuel boilers (6-70 kW) and industrial heating equipment (70 kW to 5 MW). Domestic products include pellet boilers (K-8, K-2 series with automatic BurnPell burners), manual loading boilers (K-5, K-2 series), air heating stoves (K-KO2), boiler-cookers (K-4 series), and sauna boilers (K-PR series). Industrial products comprise the K series manual loading boilers (95-1250 kW), M1 series moving grate boilers (140 kW-4 MW), M2 series wet fuel boilers (500-2500 kW), M series volcanic fuel supply boilers (95-1500 kW), MG series pellet industrial boilers (100-500 kW), and container boiler houses. Services include design, installation, consulting, and warranty maintenance. The company also provides metal subcontracting services.

Differentiator

Problem solved

Functional benefit

Products and services

• Domestic Solid Fuel Pellet Boilers

Quantifiable outcome

• Over 1000 boiler houses installed since 2003

Named customers2 records

Segments4 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration3 records

Feature5 records

Partnerships

Ten partnerships are on record, tiered minor.

• CELSISminorChannel Partner/ Reseller/ DistributorAuthorized dealer in Marijampolė, Lithuania, selling Kalvis domestic boilers
• VILPRAminorChannel Partner/ Reseller/ DistributorAuthorized dealer in Klaipėda, Lithuania, selling Kalvis domestic boilers
• ERMITAŽASminorChannel Partner/ Reseller/ DistributorMajor retail chain partner with locations in Sudmantų k., Kaunas, and Klaipėda, Lithuania
• GAMUSminorChannel Partner/ Reseller/ DistributorAuthorized dealer with locations in Zarasai, Vilnius, and Utena, Lithuania
• MOKI-VEŽIminorChannel Partner/ Reseller/ DistributorAuthorized dealer with multiple locations across Lithuania including Vilnius, Kaunas, and other cities
• ORESTINAminorChannel Partner/ Reseller/ DistributorAuthorized dealer with locations in Panevėžys, Lithuania
• SIMEKSminorChannel Partner/ Reseller/ DistributorAuthorized dealer with locations in Tauragė and Šilutė, Lithuania
• DANRITAminorChannel Partner/ Reseller/ DistributorAuthorized dealer with locations in Šialalė and Šiauliai, Lithuania
• Verslo namai (Business Home) networkminorChannel Partner/ Reseller/ DistributorInternational partner network covering Great Britain and Ireland for Kalvis products
• IT DREAMSminorOthersWebsite development company that maintains Kalvis website (stated as 'Making dreams come true: IT DREAMS')

Scale indicators4 records

Recent moves1 record

Expansion highlights6 records

Direct peers

• Windhager: Austrian biomass heating specialist producing pellet, wood-chip, and log boilers primarily for the residential and light-commercial segment. Windhager's product positioning in the 10-100 kW range directly overlaps Kalvis's domestic boiler portfolio.
• Hargassner: Austrian family-owned manufacturer of pellet, wood-chip, and log boilers across a similar 10 kW to multi-MW power range as Kalvis, with comparable dealer-network distribution and emphasis on automated combustion control.
• Herz: Austrian manufacturer of biomass boilers and heating systems (pellet, wood chip, log) with a broad product portfolio from domestic to industrial scale. HERZ competes with Kalvis in both residential and small-to-mid industrial segments across Central and Eastern Europe.
• ETA Heizkessel: Austrian biomass boiler manufacturer offering wood-chip, pellet, and log-fired systems from 20 kW domestic up to several hundred kW commercial/industrial. ETA's focus on renewable solid fuels and dealer-led distribution in DACH and export markets closely mirrors Kalvis's go-to-market model.
• Froling: Austrian manufacturer of biomass heating systems (log, pellet, chip boilers) from ~20 kW domestic to multi-MW industrial, with moving-grate combustion technology directly comparable to Kalvis's K, M1, and M2 series. Froling is one of Europe's leading biomass boiler specialists and competes head-to-head with Kalvis in the 70 kW-2 MW segment across Europe.
• Polytechnik: Austrian specialist in industrial-scale biomass combustion plants and combined heat and power systems, with moving-grate furnaces for wood waste, sawdust, and agricultural residues. Polytechnik is the closest direct competitor to Kalvis's M1/M2 wet-fuel industrial line above ~1 MW.

Broad incumbents

• Danstoker: Danish industrial boiler manufacturer specializing in biomass and waste-fired steam and hot-water plants for industrial and district heating customers. Comparable to Kalvis's industrial boiler house business above ~1 MW, with deeper presence in Scandinavian and Northern European markets.
• Viessmann: German incumbent offering a broad heating portfolio including biomass boilers, heat pumps, and fuel-cell systems. Viessmann's biomass products overlap Kalvis's range but as part of a wider, multi-technology portfolio with significantly larger R&D and distribution scale.
• Bosch Thermotechnology: Global incumbent in heating and hot-water solutions, including biomass boilers through the Buderus and Bosch brands. Significantly larger scale, multi-technology portfolio, and global service network compared with Kalvis's specialist biomass focus.

Regional players

• Weiss (Weiss-industrie): German manufacturer of industrial biomass boilers and flue-gas cleaning systems with focus on wood-fired and waste-wood applications. Operates primarily in DACH and surrounding markets with similar customer types (industrial, district heating) to Kalvis's M-series industrial range.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/watch?v=TI7UR4iG1Vc
• LinkedInlinkedin.com/company/uab-kalvis

Compliance5 records

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Kalvis