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Heat pumps · UK

RatiothermWP Max-Cube pF26

The Ratiotherm WP Max-Cube pF26 is a heat pump with SCOP (35 °C) 4.72 and refrigerant R290.1

Last updated: Technical specifications Rules in the UK ⇄ Compare this model
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SCOP (35 °C)
4.721

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

Refrigerant
R2901
Official source
Type (source)
Ground source1
Official source
Rated output 35 °C
28kW1
Official source
Rated output 55 °C
27kW1
Official source
UK

Rules in the UK

Boiler Upgrade Scheme

Check conditions

£7,500 – £9,0002Fixed grant (England & Wales)

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 28 kW; the scheme covers systems up to 45 kW.
  • SCOP at 55 °C: 3.73. 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) Ground source1
Compressors 11
Capacity control Inverter1
Performance
Rated output 35 °C 28 kW1
Rated output 55 °C 27 kW1
Efficiency
SCOP (35 °C) 4.721
SCOP (55 °C) 3.731
Seasonal efficiency ηs 35 °C 181 %1
Seasonal efficiency ηs 55 °C 141.1 %1
Noise
Indoor unit sound power 49 dB(A)1
Refrigerant
Refrigerant R2901
Refrigerant charge 1.4 kg1
Electrical
Max. power input 10.1 kW1
Connectivity & smart
SG Ready Yes1

Frequently asked questions

What is the SCOP (35 °C) of the Ratiotherm WP Max-Cube pF26?

The SCOP (35 °C) of the Ratiotherm WP Max-Cube pF26 is 4.72.1

Which refrigerant does the Ratiotherm WP Max-Cube pF26 use?

The refrigerant of the Ratiotherm WP Max-Cube pF26 is R290.1

How much Boiler Upgrade Scheme grant can you get for the Ratiotherm WP Max-Cube pF26?

£7,500 in England and Wales, provided the product and installer are MCS-certified (£9,000 when replacing oil or LPG off the gas grid, until March 2027). The installer applies and deducts the grant from your quote.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