European shift accelerates as large-scale heat pumps move from pilot to mainstream deployment

Large industrial-scale heat pumps are moving from demonstration to mainstream deployment across Europe, with a string of projects this decade illustrating how electrically driven thermal technologies can replace fossil fuels in both process heat and district heating systems.

In Austria a breakthrough for industrial process heat has been delivered at Delfort’s specialty paper plant, where Turboden , part of Mitsubishi Heavy Industries , has supplied a combined large heat pump and mechanical vapour recompression system. The plant lifts low‑grade waste heat to generate steam at 150–180 °C and 3.4 bar, enabling direct use in paper production via a 12 MW thermal unit. According to Turboden, the installation will avoid roughly 19,000 tonnes of CO2 a year. “For the industrial and energy sectors, this project stands as clear evidence that large-scale heat pump technologies are a viable and already available decarbonization solution,” Turboden CEO Paolo Bertuzzi said, and Delfort COO Hannes Kinast described the integration as a demonstration of the technology’s potential for process heat.

Municipal heating is also being reshaped by air‑sourced machines operating at unprecedented scale. In Helsinki, Helen Oy is fitting an air‑to‑water heat‑pump complex supplied by Everllence (formerly MAN Energy Solutions) at the Patola plant. The system, designed to deliver between about 20 MW and 33 MW depending on outdoor conditions and to operate down to −20 °C, uses CO2 as the refrigerant and is sized to provide roughly 200 GWh of heat annually , supplying around 30,000 households and reducing emissions by an estimated 26,000 tonnes a year from the heat pump alone. Everllence CEO Uwe Lauber said the technology offers “an economically competitive and efficient way to harness climate‑neutral heat from ambient air, even at cold temperatures of -20 °C.” Together with two 50 MW electric boilers at the site, Helen expects total heating‑system emissions cuts of about 56,000 tonnes; commissioning is targeted for the 2026/2027 heating season.

Along major waterways, river‑sourced heat pumps are being pursued as bulk, low‑carbon heat providers for dense urban networks. German utility MVV Energie is advancing a Rhine‑sourced scheme in Mannheim that it describes as the world’s largest river heat pump, comprising two 82.5 MW modules for a combined 165 MW of thermal output and aiming to supply network temperatures up to 130 °C for the Rhine‑Neckar region. “With the new river heat pump, we are investing in the energy future of Mannheim and the metropolitan region,” MVV board member Gabriël Clemens said, framing the project as a step toward fully decarbonised district heat by 2030. Construction is planned to start in mid‑2026 with commissioning in winter 2028; the project benefits from German federal funding for efficient heating networks and will use isobutane as the refrigerant. MVV also plans a hydrogen‑ready reheating plant to top up network temperatures during peak demand.

These schemes form part of a broader European trend. RheinEnergie has contracted MAN Energy Solutions to deliver a 150 MW river heat‑pump for Cologne‑Niehl, which the company says will provide climate‑neutral heat to about 50,000 households and cut roughly 100,000 tonnes of CO2 annually. In Germany’s north, Johnson Controls is supplying four large heat pumps for Hamburg’s wastewater heat project , a c.60 MW installation intended to serve up to 39,000 homes and to start delivering fossil‑free heat by 2025, with projected annual savings of around 66,000 tonnes of CO2.

For industrial decarbonisation practitioners and district heat operators the emerging wave of “mega” heat pumps offers three practical lessons. First, electrically driven heat pumping can be configured for higher‑temperature process streams when combined with technologies such as mechanical vapour recompression, broadening applicability beyond low‑temperature space heating. Second, using diverse ambient sources , air, river water, wastewater and low‑grade industrial rejects , increases siting options for large units and helps spread operational risk. Third, refrigerant selection and modular design are key: projects are favouring natural refrigerants such as CO2 and isobutane and are using multiple modules or parallel trains to enable staged deployment and maintenance without full plant outages.

There remain commercial and system integration challenges. Large heat pumps require access to low‑cost, low‑carbon electricity to deliver genuine lifecycle emission reductions; grid readiness, demand‑side flexibility and seasonal storage options will influence utilisation patterns and economics. Capital intensity and permitting , particularly for river‑sourced abstractions or installations adjacent to sensitive infrastructure , also affect pacing and cost. Public funding and regulatory incentives, exemplified by German federal support for efficient heating networks, continue to play an outsized role in de‑risking first‑of‑a‑kind projects at scale.

Industry data and recent project announcements indicate momentum is accelerating: multiple utilities and technology vendors are moving from pilot plants to multi‑megawatt deployments, and several programmes aim to supply tens of thousands of homes and large industrial heat loads with low‑carbon heat. For organisations planning decarbonisation roadmaps, the implication is clear , heat pumps now constitute a mature, scalable technology option for both process and district heating, but successful integration will depend on coordinated planning across electricity supply, grid operators, heat network managers and industrial end users.