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Aquathermally heated medieval castle
Castle de Merode in Westerlo now uses a 50 kW water-to-water heat pump connected to a closed-loop exchanger in its moat. The system operates in hybrid mode with the existing gas boiler and CHP, reducing reliance on fossil fuels while showcasing aquathermal energy use in a historic building
Flexdrill: The clean heating catalyst
Flexdrill is a lightweight, trailer-mounted drilling platform that simplifies and lowers the cost of installing ground-source heat pumps. Operable by technicians, it can drill 200 m boreholes from just 1 m² surface area in a single day, removing the need for large rigs and specialist crews.
The thermoroad – full-scale demonstration of geothermal 5th generation district heating and cooling combined with sustainable urban drainage
The Thermo-road is the world’s first road-integrated thermonet within a Sustainable Urban Drainage System, combining geothermal exchangers and stormwater retention. It supplies renewable heating and cooling to 12 homes via heat pumps, recovers wastewater heat in winter, and includes borehole
Mersey Heat
The £28 m Mersey Heat Network in Liverpool uses one of the UK’s largest two-stage water-source heat pumps to supply low-carbon heat to 6,700 homes and 1.3 million m² of commercial space, delivering 20 GWh annually. The network can expand to 45 GWh, cutting 2,000 tCO₂ per year and reducing fossil
Utilitas District Heating in Tallinn
In Tallinn, biomass CHP plants supply district heating, but much energy remains in flue gases. A two-stage economizer recovers 18 MW from the flue gas, and four heat pumps use 6 MW electricity to deliver 24 MW of heat to the 80 °C network, boosting efficiency.
River water and FGC cooling water as heat sources for a heat pump system
Savon Voima Oyj and Calefa Oy have started a cooperation project in which heat pumps utilise waste heat from the flue gas scrubber of the Joensuu biomass power plant. In the summer, when the power plant and scrubber are shut down, river water is used as the heat source for the heat pumps
Smart Saving contract for heat pumps
In autumn 2024, Finnish electricity company Väre launched Smart Heating with Kapacity.io, enabling heat pump owners to optimize energy use. Customer insights led to the Smart Savings Contract, combining a fixed-price electricity plan with smart heat pump control, set to launch in August 2025.
Heat Pumps in Historical Buildings HP4HB
In response to Austria’s reliance on Russian gas, a building replaced its gas boiler with heat pump Monoblock units. The system, installed on a specially insulated and protected base, has been successfully operating for over two heating seasons, with ongoing noise reduction improvements.
The Veijarivuorenpuisto Residential Building Hybrid Heating System
The 51-apartment Veijari-vuorenpuisto building uses a hybrid heating system combining geothermal energy, district heating, and exhaust air recovery. Smart Heating automation optimizes energy use 24/7, tracking indoor conditions, weather, and electricity prices to reduce costs and emissions
Apartment building renovation Prechtlgasse
As part of Vienna’s “Get out of gas” strategy, a nine-unit residential building was fully renovated, switching entirely to electricity while keeping existing radiators. The project uses a heat pump cascade, PV hot water storage, and solar panels to provide a sustainable, low-emission energy
Greening the Goods: Decarbonization with High Efficient Water Sourced Heat Pump
Between 2023–2024, Vestel’s white goods factory in Manisa, Türkiye, installed the country’s largest industrial-scale heat pump, recovering waste heat from air compressor cooling to supply heating. The system reduces reliance on natural gas, lowers energy costs and emissions, and simultaneously