DDG
DDG nv is a Belgian, family-owned manufacturer that designs, builds, and installs custom wood-burning stoves and fireplace inserts engineered to connect directly to a home's central heating system, serving residential and small-commercial customers across Belgium and other EU markets.
- Company typePrivate
- Founded1979
- HeadquartersWilsele, Belgium
- Headcount11–50
- GTM typeB2C
- OfferingHardware or Manufacturing
What DDG does
DDG nv is a Belgian, family-owned manufacturer of wood-burning stoves and fireplace inserts engineered exclusively to be connected to a home's central heating system. Founded in 1979 by Daniël De Glas and now run by the second generation (Daan and Yves De Glas), the company designs, produces, supplies, installs, and maintains its product range from a single site in Leuven-Wilsele. Its core technology is the proprietary Hydroline platform — a spiral stainless-steel heat exchanger coupled with a post-combustion chamber — which captures the 450-500°C heat otherwise lost through flue gases, achieving reported efficiencies above 90% and the EU A+ energy label.
The product portfolio centers on the Hydro family: the Pio Hydro (3-7 kW, for passive and low-energy homes), the Eco Hydro (4-23 kW, for well-insulated modern homes), and the F Hydro (7-30 kW, for large buildings and historic properties), supplemented by the forthcoming F40 Hydro Preinstalled entry-level unit (planned for early 2026) and the DDGbox electronic combustion controller with smartphone app. Every unit is manufactured to order with extensive customization options, and pricing is quote-based rather than published.
DDG operates a hybrid go-to-market combining direct showroom sales by appointment, factory pickup in Belgium, a network of certified installers across several European countries, and self-installer coaching with hydraulic integration diagrams. Customers are predominantly residential — homeowners retrofitting central heating, owners of passive or large historic buildings, and, increasingly, heat-pump owners using DDG as a hybrid supplementary heat source (estimated at roughly 40% of sales per company commentary). The company's certifications (SGS, Ecodesign 2022, German DIN 18891, Austrian 15a-B-VG, Cerga, Rescert) and pan-EU approval underpin its cross-border distribution.
DDG firmographics
Firmographics- Name
- DDG
- Legal name
- DDG nv
- Website
- https://ddg.be
- Company type
- Private
- Founded year
- 1979
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- DDG nv is a Belgian, family-owned manufacturer that designs, builds, and installs custom wood-burning stoves and fireplace inserts engineered to connect directly to a home's central heating system, serving residential and small-commercial customers across Belgium and other EU markets.
- Ownership category
- akta.pro rank
Where DDG is headquartered
LocationHeadquarters
- HQ city
- Wilsele
- HQ country
- Belgium
- HQ region
- Europe
Offices2 records
Markets served
DDG business model
Business model- GTM type
- B2C
- Offering type
- Hardware or Manufacturing
- Cost components
- Personnel, Operations, Technology or R&D, Marketing or Sales, Supply Chain
Revenue model
- Wood Stove and Insert Sales: DDG designs, manufactures, and sells custom-made wood-burning stoves (cv-kachels) and fireplace inserts (inbouwhaarden) that connect to central heating systems. Each unit is made to order based on customer specifications including dimensions, door types, ash evacuation options, and finishes.
- Installation and Commissioning Services: DDG provides installation services through their network of certified installers. They also offer commissioning and calibration services to ensure proper installation. Self-installation customers receive coaching and hydraulic integration diagrams.
- Maintenance and Repair Services: Annual maintenance services are offered to existing customers. Replacement parts (glass, stones, gaskets, paint) are available for purchase. Repair services both at customer site and in DDG workshop.
- Study Bureau Services: DDG provides technical consulting including capacity calculations, hydraulic integration diagrams, and system calibration for installers and architects.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| One time/ perpetual license | Pay-as-you-go | Pio Hydro - For passive and low-energy houses |
| One time/ perpetual license | Pay-as-you-go | Eco Hydro - For well-insulated modern homes |
| One time/ perpetual license | Pay-as-you-go | F Hydro - For large buildings and high power requirements |
| One time/ perpetual license | Pay-as-you-go | F40 Hydro Preinstalled - Entry-level model launching 2026 |
Go-to-market motion2 records
Distribution channels4 records
Marketing channels6 records
DDG product offering
Product offeringCore offering
DDG designs, manufactures to order, supplies, installs, and maintains wood-burning stoves and fireplace inserts that connect directly to a home's central heating system. Its product range covers 3-30 kW output via the Pio Hydro, Eco Hydro, and F Hydro lines, all built around the proprietary Hydroline combustion technology. The company also provides installation through its own certified installer network, ongoing maintenance, replacement parts, and technical study bureau services for capacity calculations and hydraulic integration.
Product overview
DDG is a Belgian manufacturer of wood-fired stoves and fireplace inserts connected to central heating systems. The product portfolio centers on the Hydro product family, which includes three main models: Pio Hydro (for low-energy/passive houses, 3-7 kW), Eco Hydro (for well-insulated modern homes, 4-23 kW), and F Hydro (for large buildings, 7-30 kW). All Hydro products feature Hydroline technology for efficient combustion and low emissions. The F40 Hydro Preinstalled offers an entry-level option ready for later central heating connection. The DDGbox is an optional electronic control add-on for Eco and F40 Hydro units enabling app-based control. All products carry A+ energy labels and conform to Ecodesign 2022. Products are manufactured to order in Leuven, Belgium.
Differentiator
Problem solved
Functional benefit
Products and services
- Pio Hydro
Quantifiable outcome
- Up to 90% efficiency vs. 450-500°C heat loss in conventional wood stoves
- +5 more outcomes
Companies that use DDG
Customer profileNamed customers6 records
Segments5 records
Ideal customer profiles4 records
DDG technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature4 records
DDG partnerships and signals
Strategic signalPartnerships
Seven partnerships are on record, tiered core and minor.
- SGS (Société Générale de Surveillance)coreSGS laboratory in Arnhem, Netherlands performs official testing and certification of DDG products. Products approved by SGS are accepted in all 27 EU member states and beyond (e.g., Norway). Testing includes door durability (6,000 open/close cycles), air tightness (10 Pa with max 2 m³/hn pressure loss), paint thickness (40 µm), and heat exchanger circulation (800-1000 L/min at up to 10 bar pressure).
- CergacoreCerga is the Belgian certification body for professional gas installers. DDG holds Cerga certification, indicating professional installation capabilities for connecting DDG products to gas-fired central heating systems.
- RescertcoreRescert is the Belgian certification body for professional installers of thermal solar systems and heat pumps. DDG holds Rescert certification, enabling proper integration of DDG products in hybrid configurations with renewable energy systems.
- Agoria / SirrisminorDDG is a member of Agoria, Belgium's technology industry association, which includes Sirris (Flemish research center for innovation and technology). Membership provides access to research collaboration opportunities.
- Febhel (Belgian Interprofessional Federation of Wood Energy)minorDDG is a member of Febhel, the Belgian interprofessional federation representing the wood energy sector. Membership connects DDG with the broader Belgian wood heating industry.
- Den AteljeeminorDen Ateljee is a Belgian social enterprise providing activities for adults with physical disabilities. They produce K-Lumet ecological firelighters from wood waste, toilet paper rolls, and candle wax. DDG supports Den Ateljee and offers K-Lumet products as gifts to customers. Social enterprise connection aligns with DDG's Belgian manufacturing philosophy.
- Research Institutes and UniversitiesminorDDG collaborates with research institutions and universities on developing innovative combustion and heat recovery technologies. DDG has maintained its own research department since 1979.
Scale indicators8 records
Recent moves6 records
Expansion highlights6 records
DDG competitors and assessment
Company assessmentDirect peers
- Contura: Swedish manufacturer of premium wood-burning stoves, part of the NIBE group. Comparable to DDG as a design-led European wood stove brand with strong positioning in Scandinavian and Northern European residential heating markets.
- Seguin Duteriez: French manufacturer of cast-iron wood-burning stoves and fireplaces. Comparable to DDG as a long-established European wood stove specialist with similar product mix and distribution through certified installer networks.
- Morsø: Danish manufacturer of cast-iron wood-burning stoves with a heritage brand and pan-European distribution. Comparable to DDG as a heritage European wood stove specialist competing in the premium residential segment.
- Heta: Danish manufacturer of wood-burning stoves including models connected to central heating. Comparable to DDG due to similar focus on high-efficiency central-heating-integrated stoves and overlapping European dealer networks.
- Spartherm: German manufacturer of fireplace inserts, stoves, and tunnel fireplaces. Comparable to DDG as a premium European fireplace/stove brand competing for installer and architect specifications across Benelux and DACH markets.
- Edilkamin: Italian manufacturer of wood and pellet stoves and fireplaces. Comparable to DDG as a European wood-heating appliance maker with broad product range and established distribution across southern and central Europe.
- Wiking: Danish manufacturer specializing in wood-burning stoves connected to central heating systems. Closest functional peer to DDG given near-identical product positioning (CV-connected wood stoves) and shared focus on efficient combustion technology.
- Rüegg: Swiss manufacturer of premium fireplaces and wood-burning stoves. Comparable to DDG as a high-end European fireplace specialist competing for architect-led custom installations in the DACH region.
- Stûv: Belgian manufacturer of premium wood-burning stoves and fireplaces with focus on design, efficiency, and clean combustion. Direct peer to DDG given shared Belgian origin, similar premium residential wood-heating positioning, and overlap in European installer and architect channels.
Broad incumbents
- Bosch Thermotechnology: Division of Bosch offering residential heating systems including heat pumps, boilers, and solid-fuel appliances. Comparable to DDG as a major incumbent in the European residential heating market that overlaps with DDG's hybrid configuration customers and installer channels.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat5 records
Key risks6 records
Key highlights7 records
Customer concentration
DDG social profiles
Digital presenceDDG compliance and trust
Trust signalCompliance9 records
DDG financial estimates
Financial estimateRevenue estimate
Valuation estimate
DDG leadership team
Management profileNumber of profiles
Profiles2 records
DDG funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
DDG 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 DDG
What does DDG do?
DDG designs, manufactures to order, supplies, installs, and maintains wood-burning stoves and fireplace inserts that connect directly to a home's central heating system. Its product range covers 3-30 kW output via the Pio Hydro, Eco Hydro, and F Hydro lines, all built around the proprietary Hydroline combustion technology. The company also provides installation through its own certified installer network, ongoing maintenance, replacement parts, and technical study bureau services for capacity calculations and hydraulic integration.
Is DDG a public or private company?
DDG is a private company. It is classified as family owned and is currently operating.
When was DDG founded?
DDG was founded in 1979. It employs 11 to 50 people.
Where is DDG based?
DDG is headquartered in Wilsele, Belgium, in the Europe region.
How does DDG make money?
Four revenue lines are on record. Wood Stove and Insert Sales are the primary driver. The others are installation and Commissioning Services, maintenance and Repair Services and study Bureau Services.
Who are DDG's main competitors?
Direct peers on record are Contura, Seguin Duteriez, Morsø, Heta, Spartherm, Edilkamin, Wiking, Rüegg and Stûv. Bosch Thermotechnology is listed as a broad incumbent.
Does DDG have an API?
No public API is recorded for DDG.