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Heat pumps · UK

STIEBEL ELTRONHPG-I 04 (D)(C)S Premium

STIEBEL ELTRON HPG-I 04 (D)(C)S Premium
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The STIEBEL ELTRON HPG-I 04 (D)(C)S Premium is a heat pump with SCOP (35 °C) 5.07 and refrigerant R454C.1

Last updated: Technical specifications Rules in the UK ⇄ Compare this model
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SCOP (35 °C)
5.071

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

Refrigerant
R454C1
Official source
Type (source)
Ground source1
Official source
Rated output 35 °C
4.23kW1
Official source
Rated output 55 °C
3.76kW1
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 4.23 kW; the scheme covers systems up to 45 kW.
  • SCOP at 55 °C: 4.02. 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
Performance
Rated output 35 °C 4.23 kW1
Rated output 55 °C 3.76 kW1
Efficiency
SCOP (35 °C) 5.071
SCOP (55 °C) 4.021
Seasonal efficiency ηs 35 °C 195 %1
Seasonal efficiency ηs 55 °C 153 %1
Energy label 35 °C A, , , 1
Energy label 55 °C A, , , 1
Noise
Indoor unit sound power 38 dB(A)1
Refrigerant
Refrigerant R454C1
Refrigerant GWP 1481
Refrigerant charge 2.2 kg1

Variants

This model is registered in 3 combinations (for example with a different indoor unit or cylinder) with exactly the same performance. All figures on this page apply to each of these types. The part of the type number that differs is in bold; small differences (e.g. cylinder volume or anode) are listed after it:

  • HPG-I 04 (D)(C)S Premium
  • WPE-I 04 H(K)(W) 230 Premium
  • WPE-I 04 H(W) 230 GB Premium

Manufacturer documentation

External links to STIEBEL ELTRON'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 STIEBEL ELTRON HPG-I 04 (D)(C)S Premium?

The SCOP (35 °C) of the STIEBEL ELTRON HPG-I 04 (D)(C)S Premium is 5.07.1

Which refrigerant does the STIEBEL ELTRON HPG-I 04 (D)(C)S Premium use?

The refrigerant of the STIEBEL ELTRON HPG-I 04 (D)(C)S Premium is R454C.1

How much Boiler Upgrade Scheme grant can you get for the STIEBEL ELTRON HPG-I 04 (D)(C)S Premium?

£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. Heat Pump Keymark certificates — EHPA / DIN CERTCO (Heat Pump KEYMARK) · 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