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Heat pumps · UK

STIEBEL ELTRONHPG-I 12 (D)(C)S Premium

STIEBEL ELTRON HPG-I 12 (D)(C)S Premium
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The STIEBEL ELTRON HPG-I 12 (D)(C)S Premium is a heat pump with SCOP (35 °C) 5.59 and refrigerant R454C.1,2

Last updated: Technical specifications Rules in the UK ⇄ Compare this model
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SCOP (35 °C)
5.592

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

Refrigerant
R454C2
Official source
Type (source)
Ground source2
Official source
Rated output 35 °C
12.03kW2
Official source
Rated output 55 °C
11.99kW2
Official source
UK

Rules in the UK

Boiler Upgrade Scheme

Check conditions

£7,500 – £9,0003Fixed 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.4,5

  • Must be MCS-certified (product and installer). Check the Ofgem product eligibility list.
  • Rated output 12.03 kW; the scheme covers systems up to 45 kW.
  • SCOP at 55 °C: 4.42. 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 source2
Compressors 11
Capacity control drehzahlregelung1
Performance
Rated output 35 °C 12.03 kW2
Rated output 55 °C 11.99 kW2
Efficiency
SCOP (35 °C) 5.592
SCOP (55 °C) 4.422
Seasonal efficiency ηs 35 °C 216 %2
Seasonal efficiency ηs 55 °C 169 %2
Energy label 35 °C A, , , 2
Energy label 55 °C A, , , 2
Noise
Indoor unit sound power 39 dB(A)2
Refrigerant
Refrigerant R454C2
Refrigerant GWP 1482
Refrigerant charge 3.1 kg2
Electrical
Max. power input 5.59 kW1
Connectivity & smart
SG Ready Yes1

Variants

This model is registered in 7 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 12 (D)(C)S Premium
  • WPE-I 12 H 230 Premium
  • WPE-I 12 H(K)(W) 230 Premium
  • WPE-I 12 H(W) 230 GB Premium
  • WPE-I 12 HK 230 Premium
  • WPE-I 12 HKW 230 Premium
  • WPE-I 12 HW 230 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 12 (D)(C)S Premium?

The SCOP (35 °C) of the STIEBEL ELTRON HPG-I 12 (D)(C)S Premium is 5.59.1,2

Which refrigerant does the STIEBEL ELTRON HPG-I 12 (D)(C)S Premium use?

The refrigerant of the STIEBEL ELTRON HPG-I 12 (D)(C)S Premium is R454C.1,2

How much Boiler Upgrade Scheme grant can you get for the STIEBEL ELTRON HPG-I 12 (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.1,2

Sources

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