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Heat pumps · UK

BESPRIME NR WW 85kW

The BES PRIME NR WW 85kW is a heat pump with SCOP (35 °C) 5.65 and refrigerant R454B.1

Last updated: Technical specifications Rules in the UK ⇄ Compare this model
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SCOP (35 °C)
5.651

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

Refrigerant
R454B1
Official source
Type (source)
Water-to-water1
Official source
Rated output 35 °C
74.8kW1
Official source
Rated output 55 °C
69.5kW1
Official source
UK

Rules in the UK

Boiler Upgrade Scheme

Not eligible

Fixed grant in England and Wales, deducted from your installer’s quote. £9,000 when replacing oil or LPG off the gas grid (until March 2027). Scotland: Home Energy Scotland grant instead.3,4

  • Must be MCS-certified (product and installer). Check the Ofgem product eligibility list.
  • Rated output 74.8 kW; the scheme covers systems up to 45 kW.
  • SCOP at 55 °C: 4.55. The installed system needs a SCOP of at least 2.8 (MCS calculation).
Heat pump grants in the UK explained →

Technical specifications

General
Type (source) Water-to-water1
Compressors 11
Capacity control drehzahlregelung1
Performance
Rated output 35 °C 74.8 kW1
Rated output 55 °C 69.5 kW1
Efficiency
SCOP (35 °C) 5.651
SCOP (55 °C) 4.551
Seasonal efficiency ηs 35 °C 218 %1
Seasonal efficiency ηs 55 °C 174 %1
Noise
Indoor unit sound power 55.3 dB(A)1
Refrigerant
Refrigerant R454B1
Refrigerant charge 14 kg1
Electrical
Max. power input 15 kW1
Connectivity & smart
SG Ready Yes1

Manufacturer documentation

External links to BES'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 BES PRIME NR WW 85kW?

The SCOP (35 °C) of the BES PRIME NR WW 85kW is 5.65.1

Which refrigerant does the BES PRIME NR WW 85kW use?

The refrigerant of the BES PRIME NR WW 85kW is R454B.1

How much Boiler Upgrade Scheme grant can you get for the BES PRIME NR WW 85kW?

Probably none. Rated output 74.8 kW; the scheme covers systems up to 45 kW.1

Sources

  1. List of eligible heat pumps (BEG) — Bundesamt für Wirtschaft und Ausfuhrkontrolle (BAFA) · accessed 29 Sept 2026
  2. Boiler Upgrade Scheme: what you can get — GOV.UK · accessed 27 Sept 2026
  3. Boiler Upgrade Scheme: guidance for installers (V5) — Ofgem · accessed 27 Sept 2026
  4. Boiler Upgrade Scheme product eligibility — Ofgem · accessed 27 Sept 2026