VMi ground source heat pumps

The widest range of accessories as standard

King of geothermal energy


VMi is a comprehensive geothermal heating system that can be used in both new and renovated single-family homes, semi-detached and terraced houses, and holiday homes. The heat pumps have been awarded the best A+++ energy classification and carry the EHPA QL quality label. Part of the Oilon and Lämpöässä geothermal heat pump range, VMi is the perfect choice for a large home with several showers or a bathtub, or a location with otherwise high domestic hot water usage. The unit has an impressive 430-l DHW tank built in, guaranteeing that here is always plenty of hot water available even for the most demanding user.

VMi heat pumps come with the most accessories already preinstalled in the market. You could say that when a VMi unit leaves the factory, installation is already half way done. Moreover, all VMi models come with the necessary ÄssäCooling and ÄssäSolar ports and connections built in. The Finnish-made and durable Lämpöässä ground source heat pumps are the most economical and worry-free alternative with the added benefit of making your home very self-sufficient.



  • An EHPA Quality Label product: The first range of heat pumps in Finland to receive the EHPA Quality Label (EHPA QL), a quality label provided by the European Heat Pump Association.
  • Safe choice: Long factory warranty combined with excellent Finnish craftsmanship.
  • Maximize your savings with unique technology: The heat pump uses only geothermal energy for space heating and domestic hot water production all year round.
  • Control for three heating circuits: Split different areas (such as wet areas) into their own zones for temperature control, or control your domestic hot water circuit. Optional accessory.
  • Easy-to-use and clear control system: Developed in Finland, the ÄssäControl system provides a clear interface for controlling your home’s heating anywhere.
  • The most extensive scope of delivery in the market: VMi heat pumps come with everything preinstalled, including built-in ports for connecting a cooling system. Installation is already half way done. You’ll be safe from unexpected additional costs, and installation is incredibly quick and easy.
  • Plenty of hot water for heavy usage: The largest built-in storage tank in the market ensures that there will be plenty of hot water for drawing a bath or running several showers at the same time.


Applications: buildings up to 500 m²


VMi ground source heat pumps are easy to use


The ÄssäControl system used in VMi heat pumps has a clear touch screen with versatile function shortcuts, making it easy to control your heat pump. If required, you can even monitor and control your heat pump with a mobile device. Remote control for the geothermal heating system is provided as an option.

To read more about ÄssäControl, download our brochure:



Or watch the video:


The most economical cooling solution


All Oilon and Lämpöässä ground source heat pumps can be equipped with ÄssäCooling units, allowing you to cool your home during the summer months at a lower cost than any other system.


Unique superheat technology


Fine-tuned over several decades, our superheat technology enables your heat pump to produce domestic hot water as a side product of heating, making your system exceptionally self-sufficient. Thanks to our advanced superheat technology, domestic hot water is heated up to the required level 100% with geothermal heat. Consequently, if you select the heat pump’s heating capacity based on the coldest winter day, the heat pump’s electric immersion heater will never be used in normal operation. Your heat pump will be able to provide space heating and produce domestic hot water at the same time, meaning that your home’s heating won’t be shut off even if you take a warm bath.



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Sales contact information

Aarnio Markus

Markus Aarnio

Sales Manager
p. 044 7576 411

Laaksonen Mikko

Mikko Laaksonen

Sales Manager
p. 044 7576 288

Petri Virta

Export Director,
Ground Source Heat Pumps
p. 044 7576 259