Calpak
Calpak is a Greek solar thermal systems manufacturer founded in 1976, producing thermosiphonic systems, forced circulation systems, X-Flow Ultratank fresh water transit tanks, and solar collectors, sold exclusively through authorized dealers and premium partners to residential and hotel customers in Greece and 50+ countries.
- Company typePrivate
- Founded1976
- HeadquartersAthens, Greece
- Headcount101–250
- GTM typeB2C
- OfferingHardware or Manufacturing
What Calpak does
Calpak (CALPAK) is a privately held Greek solar thermal systems manufacturer founded in 1976 and headquartered in Athens, with manufacturing operations in Corinth. The company designs and produces four primary product categories: thermosiphonic systems (passive solar water heaters for residential use), forced circulation solar systems (pump-driven central installations with storage tanks and controllers), X-Flow Ultratank fresh water transit tanks (available from 300L to 2,000L buffer capacity), and solar collectors including the Prisma 2.0/2.5 flat plate series and M5-210/260/260H/300 high-performance models. Its core technology converts solar radiation into thermal energy for hot water, floor heating assistance, air conditioning assistance, and pool heating; the patented X-Flow technology enables high-efficiency energy transmission with claimed 99% tank efficiency, and Speed-Exchanger technology provides on-demand hot water without stored-volume stagnation.
The company's 2024-commissioned Corinth factory applies robotic manufacturing, 5G connectivity, and artificial intelligence to production. Calpak sells exclusively through an authorized dealer network, supplemented by Calpak Premium Partners for large commercial installations and Calpak Service for certified repair and maintenance. Pricing is quote-based and handled by channel partners; Calpak does not transact retail directly. The customer base is segmented across residential properties (apartments and houses, served by dealers) and the hotel/hospitality vertical (served by Premium Partners under the dedicated 'Calpak Technical' offering), with stated scale of 652,000+ installed systems, 1,000+ large projects, 400,000+ end consumers, and distribution across 50+ countries. The company claims 1,650 tons of annual CO2 savings across its installed base and is led by Managing Director Panayis Konstantinidis.
Revenue is not publicly disclosed, and no external funding rounds, parent entities, or institutional investors are mentioned. Calpak holds an international patent on its X-Flow technology and operates an active social media presence (Facebook, Twitter, LinkedIn, YouTube) alongside its website (calpak.gr). The company is privately held, domiciled in Greece, and operates a single legal entity without disclosed subsidiaries.
Calpak firmographics
Firmographics- Name
- Calpak
- Legal name
- CALPAK
- Website
- https://calpak.gr
- Company type
- Private
- Founded year
- 1976
- Operating status
- Operating
- Headcount range
- 101–250 employees
- Short description
- Calpak is a Greek solar thermal systems manufacturer founded in 1976, producing thermosiphonic systems, forced circulation systems, X-Flow Ultratank fresh water transit tanks, and solar collectors, sold exclusively through authorized dealers and premium partners to residential and hotel customers in Greece and 50+ countries.
- Ownership category
- akta.pro rank
Calpak industry classification
Industry- Product category
- Solar Thermal Systems
- NAICS
- Ventilation, Heating, Air-Conditioning, and Commercial Refrigeration Equipment Manufacturing (33341)
- SIC
- Air-Cond & Warm Air Heatg Equip & Comm & Indl Refrig Equip (3585)
- akta.pro primary industry
- Solar Thermal & CSP Systems (Collectors, Receivers, Thermal Storage, CSP EPC) (EUAMABAL)
Keywords
Where Calpak is headquartered
LocationHeadquarters
- HQ city
- Athens
- HQ country
- Greece
- HQ region
- Europe
Offices2 records
Markets served
Calpak business model
Business model- GTM type
- B2C
- Offering type
- Hardware or Manufacturing
- Cost components
- Supply Chain, Operations, Personnel, Technology or R&D, Marketing or Sales, Infrastructure
Revenue model
- Solar Thermal Systems Sales: Manufacture and sale of solar thermal systems including thermosiphonic systems, forced circulation systems, X-Flow Ultratanks, and solar collectors through dealer network.
- Service and Maintenance: Authorized and certified repair and maintenance services for solar thermal systems through Calpak Service network.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Other | Multi-year contract | Quote-based pricing through authorized dealers |
Go-to-market motion1 record
Distribution channels3 records
Marketing channels3 records
Calpak product offering
Product offeringCore offering
Calpak manufactures and distributes a complete portfolio of solar thermal products, including thermosiphonic systems, forced circulation solar systems, X-Flow Ultratank fresh water transit tanks, and flat plate and high-performance solar collectors. Products are manufactured at a robotic, AI-enabled facility in Corinth, Greece, and sold exclusively through authorized dealers and premium partners for residential and hotel/hospitality applications across 50+ countries.
Product overview
Calpak is a Greek solar thermal technology company established in 1976, offering a comprehensive portfolio of solar water heating and thermal energy systems. The product lineup consists of four main categories: Thermosiphonic Systems (passive solar water heaters for residential use), Solar Forced Circulation Systems (pump-driven central solar systems for enhanced performance), X-Flow Ultratank (patented fresh water transit tanks with speeds-exchanger technology achieving up to 99% efficiency), and Solar Collectors (including Prisma 2.0/2.5 flat plate collectors and M5-210/260/260H/300 high-performance collectors). The company serves both residential (apartments, single-family homes) and commercial (hotels) segments through a network of authorized dealers, with products manufactured at a state-of-the-art facility in Corinth, Greece.
Differentiator
Problem solved
Functional benefit
Brands
- X-Flow Ultratank: High-performance domestic hot water transit tank with smart technology, registered international patent for energy transmission efficiency.
- Prisma 2.0
- Prisma 2.5
- M5-210
- M5-260
- M5-260H
- M5-300
Products and services
- Thermosiphonic Systems Traditional solar water heaters that use natural convection to circulate water without pumps; the company's flagship passive product line for residential hot water.
- Solar Forced Circulation Systems Central solar thermal systems with pump-driven circulation; premium systems bundling solar collectors, storage tanks, and solar station controllers for residential and commercial applications.
- X-Flow Ultratank High-performance fresh water transit tanks with patented X-Flow smart technology for rapid and efficient hot water transmission; available from 300L up to 2,000L buffer capacity with up to 99% total efficiency, including instant, bacteria-free hot water via Speed-Exchanger Technology.
- Solar Collectors Flat plate and high-performance solar collectors that convert solar radiation into thermal energy; includes Prisma 2.0/2.5 flat plate series and M5-210/260/260H/300 high-performance models for residential and commercial installations.
- Calpak Service (Repair & Maintenance) Authorized and certified repair and maintenance services for Calpak solar thermal systems, delivered through qualified technicians in the Calpak Service network.
Quantifiable outcome
- 1,650 tons CO2 savings per year
- +2 more outcomes
Companies that use Calpak
Customer profileNamed customers2 records
Segments2 records
Ideal customer profiles2 records
Calpak technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature3 records
Calpak partnerships and signals
Strategic signalPartnerships
Two partnerships are on record, tiered core.
- Calpak DealerscoreAuthorized dealer network throughout Greece providing sales, installation, and maintenance services for Calpak solar thermal products. Dealers are contracted with Calpak and committed to proper use of customer data.
- Calpak Premium PartnerscorePremium partners for larger commercial projects including hotels and hospitality sector. Provide specialized solutions for enterprise-level solar thermal installations.
Scale indicators6 records
Recent moves5 records
Expansion highlights4 records
Calpak competitors and assessment
Company assessmentDirect peers
- Viessmann: Major German manufacturer of heating, industrial, and refrigeration systems with a long-standing solar thermal product line including solar collectors and thermal storage tanks. Direct competitor to Calpak's thermosiphonic, forced circulation, and tank-based offerings in European and international markets.
- Ariston Group: Italian global leader in water heating and heating solutions, including thermosiphonic and forced-circulation solar thermal systems and storage tanks. Closest Mediterranean peer to Calpak across product categories and export-oriented business model.
- Solahart: Australia-founded specialist in solar water heaters with global distribution across 50+ countries and a strong residential hot-water focus. Closely matches Calpak's product positioning and international dealer-driven distribution model.
- Apricus: Specialist manufacturer of evacuated tube solar collectors and pre-engineered solar hot water kits, focused on residential and commercial applications. Direct peer to Calpak's solar collector and complete system offerings.
- Heliodyne: US-based manufacturer of flat-plate solar thermal collectors and complete solar hot water systems for residential and commercial applications. Closely comparable niche peer to Calpak's Prisma and M5 collector-based systems.
- Chromagen: Israeli solar water heating specialist with strong presence in Mediterranean and international markets, offering solar collectors and complete hot-water systems. Comparable Mediterranean-rooted peer to Calpak's solar thermal focus.
Broad incumbents
- Bosch Thermotechnology: Diversified European heating and hot-water solutions provider with a comprehensive solar thermal portfolio alongside heat pumps and gas condensing systems. Competes with Calpak on solar thermal but as part of a much broader HVAC portfolio.
- Vaillant Group: German heating technology group offering solar thermal collectors and storage tanks as part of its broader heating systems portfolio. Broader incumbent with overlapping solar thermal capabilities to Calpak's product line.
- Stiebel Eltron: German manufacturer specializing in hot water, heating, and renewable energy solutions, including solar thermal for residential applications. Broader incumbent with overlapping solar thermal collector and storage tank products.
- Immergas: Italian manufacturer of heating and hot water solutions including solar thermal components and complete systems. Competes with Calpak across solar thermal product categories in Mediterranean markets as part of a broader heating portfolio.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat4 records
Key risks6 records
Key highlights7 records
Customer concentration
Calpak social profiles
Digital presenceCalpak financial estimates
Financial estimateRevenue estimate
Valuation estimate
Calpak leadership team
Management profileNumber of profiles
Profiles1 record
Calpak funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Calpak 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 Calpak
What does Calpak do?
Calpak manufactures and distributes a complete portfolio of solar thermal products, including thermosiphonic systems, forced circulation solar systems, X-Flow Ultratank fresh water transit tanks, and flat plate and high-performance solar collectors. Products are manufactured at a robotic, AI-enabled facility in Corinth, Greece, and sold exclusively through authorized dealers and premium partners for residential and hotel/hospitality applications across 50+ countries.
Is Calpak a public or private company?
Calpak is a private company. It is classified as unknown and is currently operating.
When was Calpak founded?
Calpak was founded in 1976. It employs 101 to 250 people.
Where is Calpak based?
Calpak is headquartered in Athens, Greece, in the Europe region.
How does Calpak make money?
Two revenue lines are on record. Solar Thermal Systems Sales are the primary driver. The others are service and Maintenance.
Who are Calpak's main competitors?
Direct peers on record are Viessmann, Ariston Group, Solahart, Apricus, Heliodyne and Chromagen. Broad incumbents are Bosch Thermotechnology, Vaillant Group, Stiebel Eltron and Immergas.
Does Calpak have an API?
No public API is recorded for Calpak.
What industry is Calpak in?
Calpak's product category is Solar Thermal Systems. Its primary akta.pro industry code is EUAMABAL, Solar Thermal & CSP Systems (Collectors, Receivers, Thermal Storage, CSP EPC). Its NAICS code is 33341 and its SIC code is 3585.