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BoschCS3400iAWS 10 ORB-S

Bosch CS3400iAWS 10 ORB-S
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The Bosch CS3400iAWS 10 ORB-S is an air-to-water heat pump with a SCOP of 4.53 (35 °C) and a sound power level of 59 dB(A).1

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SCOP (35 °C)
4.531

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

Heating capacity (A7/W35)
8.92kW1
Official source
Outdoor unit sound power
59dB(A)1
Official source
Refrigerant
R321
Official source
Type (source)
Air-to-water1
Official source

Technical specifications

General
Type (source) Air-to-water1
Performance
Heating capacity (A7/W35) 8.92 kW1
Rated output 35 °C 9 kW1
Rated output 55 °C 8 kW1
Min. outdoor temperature -20 °C1
Efficiency
SCOP (35 °C) 4.531
SCOP (55 °C) 3.211
Seasonal efficiency ηs 35 °C 178 %1
Seasonal efficiency ηs 55 °C 125 %1
Energy label 35 °C A, , , 1
Energy label 55 °C A, , 1
COP A7/W35 4.681
Noise
Outdoor unit sound power 59 dB(A)1
Indoor unit sound power 45 dB(A)1
Refrigerant
Refrigerant R321
Refrigerant GWP 6751
Refrigerant charge 1.3 kg1

Variants

This model is registered in 3 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:

  • CS3400iAWS 10 ORB-S
  • CS3400iAWS 10 ORE-S
  • CS3400iAWS 10 ORM-S — Indoor unit sound power: 40 dB(A)

Manufacturer documentation

  • Product page (bosch-homecomfort.com)
  • Manual — Installatiehandleiding binnenunit Compress 3400i AWS (CS3400iAWS 10 M) (junkers-be-fl.boschhc-documents.com, PDF)
  • Manual — Outdoor Unit of Air to Water Heat Pump Compress 3400i AWS – Installation manual (worcester-bosch.co.uk, PDF)

External links to Bosch'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 Bosch CS3400iAWS 10 ORB-S use?

The Bosch CS3400iAWS 10 ORB-S uses R32.1

Sources

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