Inverter control provides power as it is needed

Gebwell’s Aries ground source heat pump is the first Finnish ground source heat pump with inverter in the detached house category. What does “inverter” (“frequency converter”) mean? Why does the ground source heat pump have inverter control and what are the benefits of inverters?

Traditionally, heat pumps have used compressors, which start up when a thermostat sends a signal and stop completely once a certain temperature is reached. In these “on/off” ground source heat pump models, the compressor runs at a fixed speed until it stops. The compressor restarts when the indoor temperature has decreased enough.

The control of the compressor is the key difference between on/off and inverter ground source heat pumps. Inverter technology in a ground source heat pump means that the rotational speed of the compressor is controlled. Thanks to inverter technology, the rotational speed of the compressor adapts to the heating need in real time.

Once the compressor has started up, it runs quickly at first until the set indoor temperature is reached. After this, the compressor’s rate of rotation slows and the pump operates at optimum efficiency, maintaining the set temperature.

The frequency-controlled twin rotary compressor in the Gebwell Aries inverter ground source heat pump follows this principle to regulate itself automatically according to the prevailing conditions and power requirements. The Gebwell Aries regulates its heating output (0°/35°) between 1.5 kW and 7.5 kW.

See the Gebwell Aries technical details here »

A steady temperature without overloading the compressor

The inverter-controlled compressor adapts its operations according to the actual heat requirement by increasing or decreasing its rotational speed. This means that the compressor operates more efficiently, regardless of how much heat is required. The energy efficiency of the inverter-controlled pump is most apparent when maximum heating is required.

The efficiency and comfortable, steady heat output enabled by the inverter technology also give rise to cost savings. The efficiency of inverter ground source heat pumps is better than on/off heat pumps, and this is the most important reason why they have become commonplace.

Inverter heat pumps have fewer start-ups and shut-offs of the compressor, which reduces mechanical wear on the device and prolongs its life. Furthermore, ground source heat pumps controlled according to rotational speed have a lower average noise level, although the number of decibels may rise temporarily when the compressor is running at a high speed.

In sum, inverter technology is here to stay in the ground source heat sector and it is constantly developing. Thanks to the Gebwell Aries, manufacturing of inverter ground source heat pumps has got off to a flying start in Finland.

Have you already found out about the first Finnish-made ground source frequency-controlled heat pump for the detached houses?


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