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Heat pumps · UK

HOTJET CZ7 WX (Wasser / Wasser)

The HOTJET CZ 7 WX (Wasser / Wasser) is a heat pump with SCOP (35 °C) 7.23 and refrigerant R454B.1

Last updated: Technical specifications Rules in the UK ⇄ Compare this model
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SCOP (35 °C)
7.231

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
7.47kW1
Official source
Rated output 55 °C
7.42kW1
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 7.47 kW; the scheme covers systems up to 45 kW.
  • SCOP at 55 °C: 5.34. 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 7.47 kW1
Rated output 55 °C 7.42 kW1
Efficiency
SCOP (35 °C) 7.231
SCOP (55 °C) 5.341
Seasonal efficiency ηs 35 °C 281.2 %1
Seasonal efficiency ηs 55 °C 205.6 %1
Noise
Indoor unit sound power 38 dB(A)1
Refrigerant
Refrigerant R454B1
Refrigerant charge 1 kg1
Electrical
Max. power input 3.6 kW1
Connectivity & smart
SG Ready Yes1

Frequently asked questions

What is the SCOP (35 °C) of the HOTJET CZ 7 WX (Wasser / Wasser)?

The SCOP (35 °C) of the HOTJET CZ 7 WX (Wasser / Wasser) is 7.23.1

Which refrigerant does the HOTJET CZ 7 WX (Wasser / Wasser) use?

The refrigerant of the HOTJET CZ 7 WX (Wasser / Wasser) is R454B.1

How much Boiler Upgrade Scheme grant can you get for the HOTJET CZ 7 WX (Wasser / Wasser)?

£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 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