Heat pumps · MT

ViessmannVitocal 350-G BW(S) 351.B20 (Wasser / Wasser)

The Viessmann Vitocal 350-G BW(S) 351.B20 (Wasser / Wasser) is a heat pump with SCOP (35 °C) 6.14 and refrigerant R410A.¹

Last updated: 27 September 2026 Technical specifications ⇄ Compare this model

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SCOP (35 °C): 6.14¹

Seasonal efficiency: how much heat you get per kWh of electricity across a heating season.
Refrigerant: R410A¹

Official source
Type (source): Water-to-water¹

Official source
Rated output 35 °C: 27.7kW¹

Official source
Rated output 55 °C: 28.7kW¹

Official source

Technical specifications

General
Type (source)	Water-to-water¹
Compressors	1¹
Capacity control	keine¹
Performance
Rated output 35 °C	27.7 kW¹
Rated output 55 °C	28.7 kW¹
Efficiency
SCOP (35 °C)	6.14¹
SCOP (55 °C)	4.83¹
Seasonal efficiency ηs 35 °C	237.8 %¹
Seasonal efficiency ηs 55 °C	185.1 %¹
Noise
Indoor unit sound power	50 dB(A)¹
Refrigerant
Refrigerant	R410A¹
Refrigerant charge	5.3 kg¹
Electrical
Max. power input	8.3 kW¹
Connectivity & smart
SG Ready	Yes¹

Manufacturer documentation

Product page (viessmann.de)
Datasheet / specifications — Datenblatt Vitocal 300-G/350-G – Technische Daten (viessmann.de, PDF)
Brochure / leaflet — Prospekt Vitocal 350-G (viessmann.de, PDF)

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

Frequently asked questions

What is the SCOP (35 °C) of the Viessmann Vitocal 350-G BW(S) 351.B20 (Wasser / Wasser)?

The SCOP (35 °C) of the Viessmann Vitocal 350-G BW(S) 351.B20 (Wasser / Wasser) is 6.14.¹

Which refrigerant does the Viessmann Vitocal 350-G BW(S) 351.B20 (Wasser / Wasser) use?

The refrigerant of the Viessmann Vitocal 350-G BW(S) 351.B20 (Wasser / Wasser) is R410A.¹

Sources

List of eligible heat pumps (BEG) — Bundesamt für Wirtschaft und Ausfuhrkontrolle (BAFA) · accessed 27 Sept 2026

Key figures