Germany’s heating market is a mess of local installers, complex subsidies, and 40-year-old gas boilers. It is also one of the country’s largest single sources of CO2 emissions. For over a decade, Thermondo has been methodically turning that mess into a business, one digital questionnaire and one wrench turn at a time. The Berlin-based company doesn’t just sell heat pumps; it employs the people who install them, owns the equipment in subscription models, and handles the paperwork. It is a vertically integrated bet on the boring, physical work of decarbonization.
Founded in 2012, the company has grown into what it calls Germany’s largest digital planner, seller, financier, and installer of residential heating systems [fev.vc, Unknown]. After a 2021 acquisition by Brookfield Infrastructure Partners, it now operates as a platform for the heating transition, with over 800 permanent staff and more than 500 in-house craftsmen [thermondo.de, Unknown]. The model is simple in ambition, complex in execution: replace a fragmented network of local heating engineers with a standardized, scalable service that can retrofit thousands of homes a year.
The vertical integration wedge
Thermondo’s early insight was that software alone couldn’t fix Germany’s heating problem. A digital configurator could streamline sales, but the installation bottleneck,the local craftsman with a six-month backlog,remained. So the company built its own army. Unlike pure marketplaces, Thermondo directly employs hundreds of heating technicians, operating from 14 locations across Germany [gruenderszene.de, 2017]. This control over the last mile allows it to guarantee installation within two to four weeks and manage quality [gruenderszene.de, Unknown].
The product engine is a 15-point digital questionnaire that generates suitable offers from a database of gas, oil, and heat pump systems [gruenderszene.de, Unknown]. But the real commercial engine is the shift to ‘Wärmepumpe-as-a-Service,’ a subscription model where Thermondo finances and owns the heat pump, and the customer pays a monthly fee for heat [fev.vc, Unknown]. This removes the steep upfront cost,often over €20,000,that deters many homeowners, trading capex for opex in a classic climate-tech play.
Traction in tons of CO2
The company’s growth metrics trace the arc of both a startup and a policy tailwind. In its early years, Thermondo reported 650% revenue growth over two fiscal years prior to 2017 [gruenderszene.de, 2017]. More recently, it expected to achieve over 100 million Euros in total revenue for 2022 and become profitable from the first quarter of 2023 [thermondo.de, 2023], [zfk.de, 2023]. Its strategic pivot to heat pumps is gaining momentum: five months after launching the product, it was installing about 80 heat pumps per week, claiming a 3% share of the German heat pump market [thermondo.de, 2023], [zfk.de, 2023], [thermondo.de, Unknown].
| Metric | Value |
|---|---|
| Pre-2017 Revenue Growth | 650 % over two years |
| 2022 Expected Revenue | 100 M Euros |
| Weekly Heat Pump Installs (2023) | 80 units |
| Market Share | 3 % |
The company’s investor base reflects its transition from venture-scale startup to infrastructure asset. Early backers included Rocket Internet Capital Partners and Global Founders Capital, which led a €23.5 million Series C in 2017 [Climate-KIC, July 2017]. Utility Eneco Group took a minority stake in 2016 [Eneco Group, April 2016]. The logical end point was acquisition by Brookfield Infrastructure Partners in January 2021, folding Thermondo into a global portfolio of renewable and transitional assets [MarketScreener, 2021].
The craftsman scaling problem
Owning the installation workforce is Thermondo’s moat, but it is also its heaviest operational burden. Employing over 500 craftsmen nationwide is a vastly different cost structure than running a asset-light SaaS platform. The company has already navigated the strains of scaling a physical operation, laying off 27 employees in late 2017 shortly after its major Series C round [businessinsider.de, Unknown], [deutsche-startups.de, 2017].
Competition is also consolidating. Thermondo operates in a crowded field of heating transition players, each with a different wedge:
- Aira, Enpal, 1KOMMA5°: These competitors also offer heat pump subscriptions and full-service models, creating a race for homeowner contracts.
- Octopus Energy: The UK energy giant is expanding into heat pump installations in Germany, leveraging its brand and customer base.
- Viessmann, Vaillant, Bosch: The incumbent hardware manufacturers are moving downstream into services and financing to protect their market.
Thermondo’s answer is its vertical integration and early mover advantage. By controlling the entire customer journey,from digital lead to wrench turn,it aims to deliver a reliability that pure aggregators or manufacturers cannot. The bet is that in a market plagued by delays and complexity, guaranteed quality and speed will win.
The next twelve months
With profitability targeted, the immediate focus is execution. The leadership is in transition, with founder Philipp Pausder moving to a senior advisor role at KKR and Güven Altun set to take over as CEO [Philipp Pausder - KKR | LinkedIn, 2026], [Güven Altun - HIS Renewables GmbH | LinkedIn, 2026]. The new management’s task is to prove the unit economics of the service model at scale while fending off well-capitalized rivals.
A key milestone will be the sustained ramp of heat pump installations. At 80 per week, the company is retrofitting roughly one home every two hours of the working week. To move the needle on Germany’s national targets of 500,000 new heat pumps per year, that rate will need to increase significantly. The upcoming heating law, which will effectively mandate heat pumps in many new installations, provides a powerful regulatory tailwind.
On the back of an envelope, if Thermondo maintains its 3% market share in a 500,000-unit annual market, that’s 15,000 installations per year, or nearly 300 per week. At an average system price of €25,000, that’s €375 million in annual revenue just from equipment and installation, before any service contracts. The math is compelling, but it hinges on scaling a skilled trades workforce in a tight labor market.
For all its digital front-end, Thermondo’s ultimate competition is not another app. It is the entrenched network of local heating installers,the Heizungsbauer,who have served German households for generations. Thermondo must beat them not on price alone, but on consistency, speed, and the ability to make a heat pump feel as simple as ordering a new boiler. That is a logistics and operations battle measured in vans, trained technicians, and customer trust. It is the unglamorous, essential work of getting the energy transition physically into people’s basements.
Sources
- [fev.vc, Unknown] MEET THERMONDO, A PIONEER OF THE HEATING TRANSITION | https://fev.vc/meet-thermondo-a-pioneer-of-the-heating-transition/
- [thermondo.de, Unknown] Company website and press materials
- [gruenderszene.de, 2017] Thermondo expects to grow to 300-320 employees | https://www.gruenderszene.de
- [zfk.de, 2023] Thermondo expects over 100 million Euros revenue, profitability from Q1 2023 | https://www.zfk.de
- [Climate-KIC, July 2017] Climate-KIC start Thermondo secures €23.5 million investment | https://www.climate-kic.org/news/climate-kic-start-thermondo-secures-e23-5-million-investment/
- [Eneco Group, April 2016] Eneco Group acquires minority interest in Thermondo | https://news.eneco.com/eneco-group-acquires-minority-interest-in-thermondo/
- [MarketScreener, 2021] Brookfield Infrastructure Partners acquisition of Thermondo | https://www.marketscreener.com
- [businessinsider.de, Unknown] Thermondo lays off 27 employees | https://www.businessinsider.de
- [deutsche-startups.de, 2017] Thermondo layoffs report | https://www.deutsche-startups.de
- [Philipp Pausder - KKR | LinkedIn, 2026] LinkedIn profile showing transition to Senior Advisor at KKR
- [Güven Altun - HIS Renewables GmbH | LinkedIn, 2026] LinkedIn profile showing upcoming CEO role at Thermondo