ThermoPlus

What ThermoPlus does

ThermoPlus WärmeDirektService GmbH is a Duisburg-headquartered energy contracting and services company founded in 1996 as a 100% subsidiary of Stadtwerke Duisburg AG (part of the DVV municipal-utility group). The company delivers five core contracting verticals — heat (Wärme-Contracting), cooling (Kälte-Contracting), lighting (Beleuchtungscontracting, LED), compressed air (Druckluft-Contracting), and renewable energy (Erneuerbare Energien-Contracting) — alongside district/quarter energy concepts (Innovative Energiekonzepte) and a mobile heating station rental service operating within 50 km of Duisburg 24/7. Underlying technologies include combined heat and power (BHKW), gas condensing boilers, heat pumps, photovoltaic, wind, and LED systems; ThermoPlus owns and operates these assets as economic owner, having surpassed 10,000 kW of installed capacity in 2001 and later added Duisburg's largest PV plant (1,200 kWp).

The business model is asset-heavy, subscription-like contracting: ThermoPlus plans, finances, constructs, and maintains customer energy generation facilities over multi-year contract terms, charging recurring fees for delivered energy rather than selling equipment. Supplementary revenue comes from professional services including hydraulic balancing, primary energy factor assessments, heating cost accounting, energy certificates, thermography, and legionella testing. Customers include property owners, developers, commercial and industrial businesses (hotels, shopping centers, breweries, clinics, stadiums, logistics facilities), and emergency-heating users. Go-to-market is consultative direct sales, supported by a website, email/newsletter, and service hotlines; no social media or app channels are used. The firm serves over 250 customers across Germany, operates with 9–12 stated employees, and is led by Managing Directors Marvin Rosenberger and Kai Müller.

Name

ThermoPlus

Legal name

ThermoPlus WärmeDirektService GmbH

Website

https://thermoplus.de

Company type

Private

Founded year

1996

Operating status

Operating

Headcount range

11–50 employees

Short description

ThermoPlus is a Duisburg-based energy contracting firm and 100% subsidiary of Stadtwerke Duisburg AG, offering heat, cooling, lighting, compressed air, and renewable energy contracting plus mobile heating and ancillary energy services to property owners, developers, and commercial/industrial customers across Germany.

Ownership category

akta.pro rank

Product category

Energy Contracting Services

NAICS

Steam and Air-Conditioning Supply (22133), Heating Equipment (except Warm Air Furnaces) Manufacturing (333414)

SIC

Steam & Air-Conditioning Supply (4961), Cogeneration Services & Small Power Producers (4991)

akta.pro primary industry

District Heating & Cooling Thermal Storage (Network-Integrated TES) (EUAFANAH)

akta.pro secondary industries

Heat Pumps (Air/Water/Ground Source) (IMAHAKAF), Chillers & Cooling Plant Equipment (IMAHAKAE), Heat Pump Repair & Maintenance (HSAOAHAD)

Keywords

• Energy contracting
• Heat supply services
• Energy management
• Mobile heating
• Renewable energy solutions

Headquarters

HQ city

Duisburg

HQ country

Germany

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Energy Contracting Services: ThermoPlus takes full responsibility for customer energy supply during contract periods. As economic owner, they plan, finance, construct, maintain and renew energy generation plants. Revenue is generated through long-term contracts where customers pay for energy supply rather than investing in their own equipment.
2. Mobile Heating Station Rental and Service: Mobile heating stations delivered, connected, and operated for customers experiencing heating failures or during renovations. Includes optional heating oil service.
3. Energy Services (Hydraulic Balancing, FP Assessments, Heating Cost Accounting, Energy Certificates, Thermography, Legionella Testing): Professional energy management services including hydraulic balancing, energy performance certificates, thermographic inspections, legionella testing, and heating cost accounting with complete payment management.

Pricing tiers

Go-to-market motion2 records

Distribution channels2 records

Marketing channels3 records

Core offering

ThermoPlus is an energy services company that delivers energy contracting solutions, supplying customers with heating, cooling, lighting, compressed air, and renewable energy under long-term service agreements. It also operates mobile heating stations for emergency heat supply and provides energy management services including hydraulic balancing and energy certification to improve customers' energy efficiency.

Product overview

ThermoPlus is an energy contracting and services company offering a comprehensive portfolio of energy solutions. The core offering consists of five contracting types: Wärme-Contracting (heat), Kälte-Contracting (cooling), Beleuchtungscontracting (lighting), Druckluft-Contracting (compressed air), and Erneuerbare Energien-Contracting (renewable energy). These are complemented by Innovative Energiekonzepte (innovative district energy concepts) and Mobile Heizstationen (mobile heating stations). Additionally, ThermoPlus provides supplementary energy services including Hydraulischer Abgleich (hydraulic balancing), FP-Gutachten (primary energy assessments), Heizkostenabrechnung (heating cost accounting), Energieausweise (energy certificates), Thermografie (thermography), and Legionellen-Prüfung (legionella testing). The company operates primarily in the Duisburg region and serves customers throughout Germany.

Differentiator

Problem solved

Functional benefit

Products and services

• Heat Supply Contracting
• Cooling Contracting
• Lighting Contracting
• Compressed Air Contracting

Named customers6 records

Segments4 records

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature7 records

Partnerships

Six partnerships are on record, tiered major, minor and core.

• Fernwärme Duisburg GmbHmajorTechnology or Integration · 1 January 2026Part of joint customer database arrangement under Art. 26 GDPR with other DVV group companies for shared marketing of energy products and services.
• Immobilien-Management-DuisburgmajorStrategic or Co-development Partner · 1 January 2002Partnership started in 2002 for collaborative energy solutions in Duisburg.
• Verband für Fernwärme (VfW)minorOthers · 1 January 2002ThermoPlus joined the German District Heating Association (VfW) in 2002.
• Stadtwerke Duisburg AGcoreOthers · 1 January 1996Parent company - ThermoPlus is a 100% subsidiary of Stadtwerke Duisburg AG, part of the Duisburger Versorgungs- und Verkehrsgesellschaft mbH (DVV) group. Benefits from municipal utility infrastructure, credibility, and backing.
• Emscher GenossenschaftmajorStrategic or Co-development PartnerPartnership for waste heat utilization - Revierpark project uses waste heat from Emscher Genossenschaft for heating residential homes and Niederrheintherme with construction of 1500m district heating pipeline.
• Deutsche LeasingminorOthersAcquisition of Logport PV plant from Deutsche Leasing - purchased the deteriorating PV system and completed full renovation.

Scale indicators4 records

Recent moves11 records

Expansion highlights5 records

Broad incumbents

• Veolia Deutschland: German subsidiary of Veolia operating district heating and cooling networks, energy services, and industrial utilities. Competes with ThermoPlus in municipal and industrial heating/cooling contracting, particularly in the decarbonization retrofit space.
• ENGIE Deutschland: German arm of global energy services group ENGIE, offering energy contracting (Wärme-, Kälte-, Druckluft-Contracting), facility management, and decarbonization services to industrial, commercial, and municipal customers. Directly comparable service portfolio to ThermoPlus but at national scale with thousands of employees.
• Viessmann: German manufacturer of heating, industrial, and refrigeration systems including heat pumps and condensing boilers. Adjacent competitor — ThermoPlus specifies and installs Viessmann and similar equipment in its contracting projects, making Viessmann both a supplier and partial substitute.
• Dalkia Deutschland: Subsidiary of EDF offering energy services, district heating, and technical facility management across Germany. Competes head-to-head with ThermoPlus in heating and cooling contracting, with broader geographic reach and larger contract sizes.
• Stadtwerke München (SWM Services): Municipal utility for Munich operating extensive district heating and cooling networks and energy contracting services. Comparable to ThermoPlus as a municipal utility offering decentralized heating solutions, but at vastly larger scale and serving a major metropolitan market.
• E.ON Energy Solutions: B2B energy services arm of E.ON offering distributed energy, heat networks, and decarbonization solutions to commercial, industrial, and municipal customers. Overlapping with ThermoPlus on heating contracting, cooling, and energy efficiency services but with national footprint and balance sheet scale.

Regional players

• Stadtwerke Krefeld (SWK): Municipal utility in Krefeld with energy services subsidiary providing contracting solutions to local property owners and businesses. Structurally analogous to ThermoPlus as a municipal-utility-owned contracting arm, but serving a different geographic market in the Niederrhein region.

Direct peers

• GETEC Group: German energy services provider specializing in energy contracting (Wärme, Kälte, Dampf, Druckluft) and energy management for industrial and commercial customers. Closest direct competitor to ThermoPlus in terms of service mix and mid-market contract size.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

Compliance1 record

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 ThermoPlus