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Xtherma Flex-System 08

The Xtherma Flex-System 08 is an air-to-water heat pump with a SCOP of 5.05 (35 °C) and a sound power level of 54 dB(A).1,2

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SCOP (35 °C)
5.052

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
7kW2
Official source

Technical specifications

General
Type (source)Air-to-water1
Compressors11
Capacity controldrehzahlregelung1
Performance
Rated output 35 °C7 kW2
Rated output 55 °C6 kW2
Efficiency
SCOP (35 °C)5.052
SCOP (55 °C)3.92
Seasonal efficiency ηs 35 °C199 %2
Seasonal efficiency ηs 55 °C153 %2
Energy label 35 °CA+++2
Energy label 55 °CA++2
COP A7/W355.071
COP A2/W354.71
COP A-7/W353.11
Noise
Outdoor unit sound power54 dB(A)2
Indoor unit sound power33 dB(A)2
Refrigerant
RefrigerantR2901
Refrigerant charge0.7 kg1
Electrical
Max. power input2.76 kW1
Connectivity & smart
SG ReadyYes1

How it ranks

SCOP (35 °C): better than 85% of comparable models in our database (Heat pumps · Air-to-water · 6–8 kW; n = 182).

Rank 23 of 183

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.

Similar models

Other brands, same type and a comparable size.

More from Xtherma

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How we collect and check this data →

Frequently asked questions

Which refrigerant does the Xtherma Flex-System 08 use?

The Xtherma Flex-System 08 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 15, 2026