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Heat pumps · UK

HeliothermH-MS-15

The Heliotherm H-MS-15 is a heat pump with SCOP (35 °C) 5.92 and refrigerant R290.1

Last updated: Technical specifications Rules in the UK ⇄ Compare this model
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SCOP (35 °C)
5.921

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
15kW1
Official source
Rated output 55 °C
15kW1
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 15 kW; the scheme covers systems up to 45 kW.
  • SCOP at 55 °C: 4.78. 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 15 kW1
Rated output 55 °C 15 kW1
Efficiency
SCOP (35 °C) 5.921
SCOP (55 °C) 4.781
Seasonal efficiency ηs 35 °C 237 %1
Seasonal efficiency ηs 55 °C 183 %1
Noise
Indoor unit sound power 42 dB(A)1
Refrigerant
Refrigerant R2901
Refrigerant charge 2.45 kg1
Electrical
Max. power input 6.5 kW1
Connectivity & smart
SG Ready Yes1

Frequently asked questions

What is the SCOP (35 °C) of the Heliotherm H-MS-15?

The SCOP (35 °C) of the Heliotherm H-MS-15 is 5.92.1

Which refrigerant does the Heliotherm H-MS-15 use?

The refrigerant of the Heliotherm H-MS-15 is R290.1

How much Boiler Upgrade Scheme grant can you get for the Heliotherm H-MS-15?

£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