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VaillantVWL 125/5 AS 230V S2 + VWL 127/5 IS

Vaillant VWL 125/5 AS 230V S2 + VWL 127/5 IS
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The Vaillant VWL 125/5 AS 230V S2 + VWL 127/5 IS is an air-to-water heat pump with a SCOP of 4.42 (35 °C) and a sound power level of 52 dB(A).1

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SCOP (35 °C)
4.421

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

Heating capacity (A7/W35)
10.25kW1
Official source
Outdoor unit sound power
52dB(A)1
Official source
Refrigerant
R410A1
Official source
Type (source)
Air-to-water1
Official source

Technical specifications

General
Type (source) Air-to-water1
Performance
Heating capacity (A7/W35) 10.25 kW1
Rated output 35 °C 13.57 kW1
Rated output 55 °C 13.45 kW1
Min. outdoor temperature -20 °C1
Efficiency
SCOP (35 °C) 4.421
SCOP (55 °C) 3.441
Seasonal efficiency ηs 35 °C 174 %1
Seasonal efficiency ηs 55 °C 135 %1
Energy label 35 °C A, , 1
Energy label 55 °C A, , 1
COP A7/W35 4.541
Noise
Outdoor unit sound power 52 dB(A)1
Indoor unit sound power 45 dB(A)1
Refrigerant
Refrigerant R410A1
Refrigerant GWP 2,0881
Refrigerant charge 3.6 kg1

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:

  • VWL 125/5 AS 230V S2 + VWL 127/5 IS
  • VWL 125/5 AS 230V S2 + VWL 128/5 IS — Indoor unit sound power: 43 dB(A)

Manufacturer documentation

  • Product page (vaillant.de)
  • Brochure / leaflet — Produktinfo aroTHERM Split (vaillant.de, PDF)
  • Manual — aroTHERM Split Bedienungs- und Installationsanleitung VWL 105/5 AS S2, VWL 125/5 AS S2 (vaillant.de, PDF)
  • Manual — aroTHERM Split Bedienungs- und Installationsanleitung VWL 127/5 IS (vaillant.de, PDF)

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

Frequently asked questions

Which refrigerant does the Vaillant VWL 125/5 AS 230V S2 + VWL 127/5 IS use?

The Vaillant VWL 125/5 AS 230V S2 + VWL 127/5 IS uses R410A.1

Sources

  1. Heat Pump Keymark certificates — EHPA / DIN CERTCO (Heat Pump KEYMARK) · accessed 29 Sept 2026