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Heat pumps · UK

Clausius classic HC 3-15

The Clausius classic HC 3-15 is a heat pump with SCOP (35 °C) 5.3 and refrigerant R410A.1,2

Last updated: Technical specificationsRules in the UK⇄ Compare this model
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SCOP (35 °C)
5.32

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

Refrigerant
R410A1
Official source
Type (source)
Ground source1
Official source
Rated output 35 °C
14kW2
Official source
Rated output 55 °C
14kW2
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 14 kW; the scheme covers systems up to 45 kW.
  • SCOP at 55 °C: 4.38. 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 °C14 kW2
Rated output 55 °C14 kW2
Efficiency
SCOP (35 °C)5.32
SCOP (55 °C)4.382
Seasonal efficiency ηs 35 °C209 %2
Seasonal efficiency ηs 55 °C172 %2
Energy label 35 °CA+++2
Energy label 55 °CA+++2
Noise
Indoor unit sound power42 dB(A)2
Refrigerant
RefrigerantR410A1
Refrigerant GWP2,0881
Grants & market
ISDE grant (NL)5,025 €1

How it ranks

SCOP (35 °C): better than 66% of comparable models in our database (Heat pumps · Ground source · ≥ 14 kW; n = 123).

Rank 42 of 124

Compared with every model on VersusIndex in the same group with a known value; equal values do not count as better. This says nothing about price, installation or reliability.

Similar models

Other brands, same type and a comparable size.

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Guides on heat pumps

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Frequently asked questions

What is the SCOP (35 °C) of the Clausius classic HC 3-15?

The SCOP (35 °C) of the Clausius classic HC 3-15 is 5.3.1,2

Which refrigerant does the Clausius classic HC 3-15 use?

The refrigerant of the Clausius classic HC 3-15 is R410A.1,2

How much Boiler Upgrade Scheme grant can you get for the Clausius classic HC 3-15?

£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.1,2

Sources

  1. ISDE heat pump notification code list — Rijksdienst voor Ondernemend Nederland (RVO) · accessed 25 Oct 2026
  2. European Product Registry for Energy Labelling (EPREL) – heat pumps — Europese Commissie · accessed 15 Oct 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