Replacing an Oil-Fired Heating System – Modern Heat Pump Technology - Lambda Wärmepumpen

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A successful heating system retrofit. Instead of the old oil-fired boiler, the building is now heated by an EU13L.

Facts and Figures

Type	EU13L
In service since	November 2020
Location	Lahnau (DE)
Hydraulics	Heating buffer tank and heat pump boiler
Distribution system	Radiators

Energy Monitoring: November 2020 – January 2021:

References from residential construction

Single-family home in Hopfgarten in Tyrol switches from gas to a heat pump

This heat pump replaces an old gas heating system in a single-family home. By intelligently connecting the solar power system to the heat pump, excess electrical power is used to heat the storage tanks and the building.

Oil boiler replacement for a single-family home in Westendorf, Tyrol

Instead of the old oil-fired boiler, an EU13L now heats this single-family home in Westendorf, Tyrol.

Replacement of a (LPG) heating system in an existing building with 3 residential units in Hopfgarten in Tyrol

In this existing building, the propane heating system was removed and replaced with a modern heat pump system.

Out with the oil boiler, in with the heat pump in a three-unit building in Merano (Italy)

In this multi-family building, heating and hot water will be provided in the future by a climate-friendly air-to-water heat pump instead of fossil fuel-based heating oil.

Apartment building in Westendorf, Tyrol

One of the first field test units is located in Westendorf, Tyrol. At this farmhouse, which has a total living area of 450 square meters and five residential units, the oil-fired boiler was replaced with an EU13L air-to-water heat pump.

Single-family home in Thiersee (AT)

Instead of the old oil-fired boiler, this single-family home in Thiersee is now heated by an EU08L. Previously, 1,000 liters of heating oil were used annually for space heating. By connecting it to the photovoltaic system with an energy storage unit, the building can now be heated largely at no cost.

Replacement of the heating oil system in an existing building with 3 residential units in Mondsee (AT)

"Out with the oil, in with the heat pump" was the motto for this heating system upgrade. With the EU13L, heating costs were reduced by 60%.

Newly built single-family home in Westendorf, Tyrol

This new building, with approximately 250 square meters of living space, is powered by an EU13L system. Hot water is produced hygienically via a fresh water system. Combined with the “PV fence” and an electrical energy storage system, energy costs are reduced to a minimum.

Replacement of the oil-fired heating system in a single-family home in Lahnau (Germany)

A successful heating system retrofit. Instead of the old oil-fired boiler, the building is now heated by an EU13L.

Customer testimonial: Real numbers, clear results – Two years of operation with the Lambda EU13L

Two years ago, the customer chose the Lambda EU13L to provide his older home, built in 1964, with heat and hot water in an efficient, climate-friendly, and future-proof manner. This comprehensive review reflects the performance and efficiency of LAMBDA heat pumps.

One unit, three apartments – heating 519 square meters with just one heat pump

In 2023, a modern apartment building with three units and a total living area of 519 m² was built in Heilbronn. For Dipl.-Ing. Johannes Ehnes, one thing was clear from the start: a heat pump would handle all heating and hot water needs—energy-efficient, durable, and future-proof.

Efficient heating in a historic home: The LAMBDA heat pump performs flawlessly at 1,500 meters above sea level in the Dolomites

Nestled in the heart of the Dolomites, at an altitude of about 1,500 meters, a LAMBDA heat pump proves that efficient heating is possible even under extreme conditions. Our customer, Sem Valentini, is already entering his fifth heating season—convinced by the technology and the independence it offers him.

Efficient Heating in Older Buildings – LAMBDA Heat Pump in Southern Burgenland

In the Oberwart district of southern Burgenland, the Reiss family decided to switch to a LAMBDA heat pump. Since 2022, their home—built in 1948—has been heated efficiently and sustainably using renewable energy. Despite using traditional radiators as the heat distribution system, the system impresses with its high efficiency and reliable operation.

Hospitality guaranteed – thanks to a cascade of 3 LAMBDA EU20 L heat pumps

The history of the Landgasthaus zur Quelle in Seeshaupt is a testament to tradition and innovation. Originally known as a post station and beer hall, the building has become an integral part of the village landscape since the early 20th century.