Two years ago, the customer chose the Lambda EU 13 L to provide his 1964 home with efficient, eco-friendly, and future-proof heating and hot water. This comprehensive review reflects the performance and efficiency of LAMBDA heat pumps.
Buying Decision: Why Choose a LAMBDA Heat Pump
Background of the decision
- Climate crisis and political independence:
The war in Ukraine and the climate crisis were decisive factors in the decision to avoid fossil fuels. The goal was to take responsibility and reduce CO₂ emissions.
- Before the renovation, the house consumed 35,000 kWh of gas per year.
Advantages of the Lambda EU 13 L
- Maximum efficiency: One of the most efficient heat pumps on the market, ideal for reducing primary energy consumption.
- Quiet operation: Even in a quiet residential area, the Lambda is barely audible, significantly quieter than other units in the neighborhood.
- Sustainability and cost-effectiveness: Its combination of efficiency, quiet operation, and compatibility with the PV system made it the best choice for the customer.
Information Sources and Consultation
- The decision was supported by the BAFA list, discussions with Mr. Clemens Hill (Energiereform) and Mr. Bernd Döppes (Döppes Sanitär Technik; local installer).
Technical and financial results
Efficiency figures
- Heating: Despite using traditional radiators in an older building, the customer achieved an annual performance factor (APF) of over 6.
- Hot water: With our fresh water station, we achieve an ACO of over 5.
Energy self-sufficiency and sustainability
- Thanks to the combination of the Lambda heat pump, a large PV system, and an energy storage unit, the house functions as a net-zero energy home:
Grid electricity purchased: approx. 2,000 kWh/year
Electricity fed into the grid: approx. 9,500 kWh/year
Net surplus: +7,500 kWh/year - The energy costs for electricity, heating, and hot water are thus effectively zero euros per year.
- The self-sufficiency rate is approximately 80% over the course of the entire year.
Measurement accuracy
- The values also correspond plausibly after comparison with the official electricity meter of the local utility. The deviation is less than 2% over the course of a year.
Experience with installation and commissioning
The installation took place in November, yet the commissioning went smoothly and without any issues
Visual and Acoustic Integration
The Lambda is unobtrusive both visually and acoustically. It blends perfectly into the front yard and goes unnoticed even in a quiet environment.
Original customer records
Customer testimonial
“We would like to thank you for the outstanding quality and reliability of your solution, which not only impresses us from a technical standpoint but also makes a significant contribution to a more sustainable future.”
