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Heat pumps · UK

NIBEF1355-43

The NIBE F1355-43 is a heat pump with SCOP (35 °C) 6.3 and refrigerant R410A.1

Last updated: Technical specifications Rules in the UK ⇄ Compare this model
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SCOP (35 °C)
6.31

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
58kW1
Official source
Rated output 55 °C
52kW1
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 58 kW; the scheme covers systems up to 45 kW.
  • SCOP at 55 °C: 5.05. 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 21
Capacity control leistungsstufen1
Performance
Rated output 35 °C 58 kW1
Rated output 55 °C 52 kW1
Efficiency
SCOP (35 °C) 6.31
SCOP (55 °C) 5.051
Seasonal efficiency ηs 35 °C 244 %1
Seasonal efficiency ηs 55 °C 194 %1
Noise
Indoor unit sound power 47 dB(A)1
Refrigerant
Refrigerant R410A1
Refrigerant charge 2.1 kg1
Electrical
Max. power input 9.76 kW1
Connectivity & smart
SG Ready Yes1

Manufacturer documentation

  • Brochure / leaflet — NIBE F1355 – Product leaflet (PBD) (assetstore.nibe.se)
  • Manual — NIBE F1355 – Installer manual (IHB) (assetstore.nibe.se)

External links to NIBE'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 NIBE F1355-43?

The SCOP (35 °C) of the NIBE F1355-43 is 6.3.1

Which refrigerant does the NIBE F1355-43 use?

The refrigerant of the NIBE F1355-43 is R410A.1

How much Boiler Upgrade Scheme grant can you get for the NIBE F1355-43?

Probably none. Rated output 58 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 27 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