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Heat pumps · UK

Heliotherm SNTM-S-3-10

The Heliotherm SNTM-S-3-10 is a heat pump with SCOP (35 °C) 6.1 and refrigerant R290 (PROPAAN).1,2

Last updated: Technical specificationsRules in the UK⇄ Compare this model
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SCOP (35 °C)
6.12

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

Refrigerant
R2901PROPAAN
Official source
Type (source)
Ground source1
Official source
Rated output 35 °C
10kW2
Official source
Rated output 55 °C
10kW2
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 10 kW; the scheme covers systems up to 45 kW.
  • SCOP at 55 °C: 4.1. 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 °C10 kW2
Rated output 55 °C10 kW2
Efficiency
SCOP (35 °C)6.12
SCOP (55 °C)4.12
Seasonal efficiency ηs 35 °C241 %2
Seasonal efficiency ηs 55 °C161 %2
Energy label 35 °CA+++2
Energy label 55 °CA+++2
Noise
Indoor unit sound power51 dB(A)2
Refrigerant
RefrigerantR290 (PROPAAN)1
Refrigerant GWP31
Grants & market
ISDE grant (NL)4,425 €1

How it ranks

SCOP (35 °C): better than 93% of comparable models in our database (Heat pumps · Ground source · 10–14 kW; n = 46).

Rank 4 of 47

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.

More from Heliotherm

All Heliotherm models (6) →

Guides on heat pumps

How we collect and check this data →

Frequently asked questions

What is the SCOP (35 °C) of the Heliotherm SNTM-S-3-10?

The SCOP (35 °C) of the Heliotherm SNTM-S-3-10 is 6.1.1,2

Which refrigerant does the Heliotherm SNTM-S-3-10 use?

The refrigerant of the Heliotherm SNTM-S-3-10 is R290 (PROPAAN).1,2

How much Boiler Upgrade Scheme grant can you get for the Heliotherm SNTM-S-3-10?

£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 27 Sept 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