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ES Energy SaveES M12 R290 + ES M100L ST UK

The ES Energy Save ES M12 R290 + ES M100L ST UK is an air-to-water heat pump with a SCOP of 4.85 (35 °C) and a sound power level of 54 dB(A).1,2

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SCOP (35 °C)
4.852

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

Outdoor unit sound power
54dB(A)2
Official source
Refrigerant
R2901
Official source
Type (source)
Air-to-water1
Official source
Rated output 35 °C
9kW2
Official source

Technical specifications

General
Type (source) Air-to-water1
Compressors 11
Capacity control drehzahlregelung1
Performance
Rated output 35 °C 9 kW2
Rated output 55 °C 9 kW2
Efficiency
SCOP (35 °C) 4.852
SCOP (55 °C) 3.952
Seasonal efficiency ηs 35 °C 191 %2
Seasonal efficiency ηs 55 °C 155 %2
Energy label 35 °C A, , , 2
Energy label 55 °C A, , , 2
COP A7/W35 5.041
COP A2/W35 4.851
COP A-7/W35 3.121
Noise
Outdoor unit sound power 54 dB(A)2
Refrigerant
Refrigerant R2901
Refrigerant charge 0.9 kg1
Electrical
Max. power input 4.14 kW1
Connectivity & smart
SG Ready Yes1

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:

  • ES M12 R290 + ES M100L ST UK
  • ES M12 R290 + ES M250L ST UK

Frequently asked questions

Which refrigerant does the ES Energy Save ES M12 R290 + ES M100L ST UK use?

The ES Energy Save ES M12 R290 + ES M100L ST UK uses R290.1,2

Sources

  1. List of eligible heat pumps (BEG) — Bundesamt für Wirtschaft und Ausfuhrkontrolle (BAFA) · accessed Sep 27, 2026
  2. European Product Registry for Energy Labelling (EPREL) – heat pumps — Europese Commissie · accessed Oct 9, 2026