Air-to-water heat pump NIBE S2125

The NIBE S2125 is an intelligent, inverter-controlled air/water heat pump. In combination with the indoor units, it automatically regulates the power demand all year round and forms an efficient air-conditioning system. Thanks to the natural refrigerant R290, it is particularly environmentally friendly.

area of application
Single family house, new construction, renovation
Heat source
Outdoor installation
Power range
2 - 9 kW
A heat pump of the product type S2125 from NIBE.

Product details

The advantages of the NIBE S2125 at a glance:

  • Whisper-quiet operation
    Thanks to a sound power level of 50 dB(A)
  • Minimum operating costs
    Through inverter technology to the optimum power range
  • Combination possibility
    up to 8 heat pumps in cascade
  • Milestone in efficiency
    With a SCOP greater than 5.0
  • Working range for any climate
    Flow temperature up to 75 °C
  • Environmentally friendly refrigerant
    Natural refrigerant R290
  • Overview and status
    Through the Internet connection myuplink the full control and monitoring even remotely

Climate premium

Are you replacing a fossil gas or oil heating system with a renewable heating system? Benefit from attractive subsidies.


  • Roth-Halden air-to-water heat pump-NIBE-Schmid

    Single family house | Agriculture and forestry | S2125 | Ambient air

    Roth, 9223 Halden

Do you have any questions?

Benefit from our many years of experience and let our specialists advise you individually, without obligation and free of charge.

Frequently asked questions?

An air-to-water heat pump extracts energy from the ambient air, transfers it to the refrigerant, and uses a compressor to produce heat that is used for heating and domestic hot water. In summer, the process can be modified for cooling.

A brine-to-water heat pump uses geothermal energy. To do this, it draws thermal energy from the ground and conducts the heat into the house. The heat extraction works even if the upper layer of the earth is frozen in winter, because the geothermal heat remains constant.

The heat pumps are suitable for both and and can thus be used in new buildings and renovation properties. The maximum flow temperature in continuous operation should not exceed 55°C, as the efficiency decreases sharply.

However, it is worth replacing the old radiators with new ones with a larger heating surface. Seek advice from specialists. In general, energy-saving measures on the building envelope to directly reduce the heat demand and thus the flow temperatures should be examined.

Yes, because all our heat pump systems are designed for the design temperature. However, there are some differences between the various heat pump systems that need to be considered:

Air-to-water heat pumps:

Air-to-water heat pumps have a lower operating limit of approx. -25°C. For heating systems, this means that the heat output is guaranteed up to the design temperature (in the midlands, for example, at -7°C outside temperature). If the outside temperature drops below this design temperature for one or more days, the auxiliary heating switches on automatically. Statistically, however, this case occurs only very rarely.

Brine-to-water heat pumps:

With these heat pumps, the correct dimensioning of the geothermal probes is important. The heat at depth is constant and changes only minimally, even if the upper layer of the earth is frozen.

The heat pump needs on average 7'200 kWh per year, but this is strongly dependent on the energy requirement of the building. A heat pump in combination with a photovoltaic system makes sense and helps to reduce the cost of electricity consumption.

The sound insulation of heat pumps can be improved by structural measures. The most important is the physical decoupling of floors, walls and pipes. Sound insulation hoods or sound insulation walls can also significantly reduce noise generation.

Heat pumps are in principle very low maintenance. However, a heat pump should not be neglected. Dirt on the outdoor unit or in the heating circuit, incorrect settings, wrong heating curve, etc., can damage the heat pump or its efficiency. Therefore, a periodic maintenance is always advantageous and extends the life expectancy.

Air / water heat pump NIBE S2125

The NIBE S2125 is an intelligent, inverter-controlled air/water heat pump. Combined with NIBE's indoor units, it forms an efficient air-conditioning system for your home. Because it automatically adjusts to the power demand throughout the year, the NIBE S2125 runs very efficiently and is extremely environmentally friendly thanks to the use of the natural refrigerant R290.

The NIBE S2125 has a high seasonal performance factor (SCOP)*, which results in low operating costs for heating and preparing hot water. The operating range allows a supply temperature of up to 75°C. At outdoor temperatures as low as -25°C, it still delivers up to 65°C, while the noise level remains extremely low. The standard active cooling system provides a comfort gain in summer temperatures. The NIBE S2125 is available
is available in two capacity sizes. Together with the NIBE S-series indoor units with integrated WLAN connection, the NIBE S2125 becomes a central part of
of your networked home. The smart technology regulates the indoor climate automatically, while you have full control of your heat pump via your smartphone or tablet.

Natural refrigerant R290

R290 (propane) is a natural refrigerant with a GWP (Global Warming Potential) of 3. R290 is therefore very environmentally friendly because it neither damages the ozone layer nor contributes to the greenhouse effect.


The NIBE S2125 is reversible and can therefore also be used for cooling.
can also be used for cooling. This is a pleasant gain in comfort, especially in summer temperatures.

We strive to maximize the performance of each NIBE product while looking at the system as a whole to create a complete comfort system. That's why we offer a wide range of smart, highly efficient products for cooling, heating and supplying hot water to your home. By harnessing the forces of nature, you can create a perfect indoor climate with little impact on the environment.