Retrofitting for the Future: R290 Heat Pump Achieves 75°C High-Temperature Heating in German Residential Project

Mar. 24, 2026

[Location: Berlin, Germany] – As Europe accelerates its transition away from fossil fuels, a landmark residential retrofit project in suburban Berlin has successfully demonstrated the superior performance of the R290 (Propane) Monoblock Heat Pump in cold climates.

The Challenge: Aging Radiators and Sub-zero Winters

The project involved a 1990s detached house equipped with traditional high-temperature gas boilers and old-fashioned radiators. The homeowner sought a sustainable heating solution that could provide sufficient warmth during Germany’s harsh winters (averaging -10°C to -15°C) without the prohibitive cost of replacing the entire indoor piping and radiator system.

The Solution: R290 Eco-Friendly Innovation

After a technical assessment, the installation team selected the [Bobiller] R290 Air Source Heat Pump.

High Flow Temperature: Unlike conventional heat pumps, the R290 refrigerant allows for a stable outlet water temperature of up to 75°C, making it the perfect "drop-in" replacement for gas boilers.
Green Energy Compliance: With a Global Warming Potential (GWP) of only 3, R290 is future-proof against strict EU F-Gas regulations, ensuring the homeowner avoids future refrigerant tax hikes or bans.

Performance Results: Efficiency Meets Comfort

Since its installation in late 2024, the system has delivered impressive results:

ERP A+++ Energy Rating: The system maintained high efficiency even at an ambient temperature of -25°C.
Energy Savings: The household reported a 55% reduction in annual heating costs compared to the previous gas-based system.
Smart Control: Integrated WiFi and Modbus functionality allow the user to monitor energy consumption in real-time via a smartphone app.

Conclusion

"This project proves that R290 technology is the gold standard for European home renovations," said the lead engineer. "It delivers the high heat required for old buildings while staying 100% eco-friendly."

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