versusindex
INT
Heat pumps · INT

NIBE S2125-20 3X400V

NIBE S2125-20 3X400V
Image: NIBErequest removal

The NIBE S2125-20 3X400V is an air-to-water heat pump with a SCOP of 5.3 (35 °C) and a sound power level of 55 dB(A).1,2

Last updated: Technical specifications⇄ Compare this model
Search this model
SCOP (35 °C)
5.32

Seasonal efficiency: how much heat you get per kWh of electricity across a heating season.

Heating capacity (A7/W35)
11.38kW1
Official source
Outdoor unit sound power
55dB(A)2
Official source
Refrigerant
R2901
Official source
Type (source)
Air-to-water1
Official source

Technical specifications

General
Type (source)Air-to-water1
Performance
Heating capacity (A7/W35)11.38 kW1
Rated output 35 °C11 kW2
Rated output 55 °C11 kW2
Min. outdoor temperature-22 °C1
Efficiency
SCOP (35 °C)5.32
SCOP (55 °C)4.082
Seasonal efficiency ηs 35 °C209 %2
Seasonal efficiency ηs 55 °C160 %2
Energy label 35 °CA+++2
Energy label 55 °CA+++2
COP A7/W3551
Noise
Outdoor unit sound power55 dB(A)2
Indoor unit sound power35 dB(A)2
Refrigerant
RefrigerantR2901
Refrigerant GWP31
Refrigerant charge1.15 kg1

How it ranks

SCOP (35 °C): better than 92% of comparable models in our database (Heat pumps · Air-to-water · 10–14 kW; n = 308).

Rank 22 of 309

Compared with every model on VersusIndex in the same group with a known value; equal values do not count as better. This says nothing about price, installation or reliability.

Variants

This model is registered in 2 combinations (for example with a different indoor unit or cylinder) with exactly the same performance. All figures on this page apply to each of these types. The part of the type number that differs is in bold; small differences (e.g. cylinder volume or anode) are listed after it:

  • S2125-20 3X400V
  • S2125-20 1X230V

Manufacturer documentation

External links to NIBE's official website. The manufacturer may change or move documents; where they differ, the manufacturer's latest version applies.

Compare with

Similar models

Other brands, same type and a comparable size.

More from NIBE

All NIBE models (29) →

Featured in these lists

How we collect and check this data →

Frequently asked questions

Which refrigerant does the NIBE S2125-20 3X400V use?

The NIBE S2125-20 3X400V uses R290.1,2

Sources

  1. Heat Pump Keymark certificates — EHPA / DIN CERTCO (Heat Pump KEYMARK) · accessed Sep 29, 2026
  2. European Product Registry for Energy Labelling (EPREL) – heat pumps — Europese Commissie · accessed Oct 15, 2026