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Heat pumps · UK

Sunex Nexus M13 EVI

The Sunex Nexus M13 EVI is an air-to-water heat pump with a SCOP of 4.73 (35 °C) and a sound power level of 65 dB(A). Under permitted development the limit is 37 dB(A) measured 1 m in front of the centre of a neighbour’s habitable-room door or window. Free-standing, the indicative minimum distance is 10.0 m; against a wall 14.2 m.1,2

Last updated: Technical specificationsRules in the UK⇄ Compare this model
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SCOP (35 °C)
4.732

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

Outdoor unit sound power
65dB(A)2
Official source
Refrigerant
R321
Official source
Type (source)
Air-to-water1
Official source
Rated output 35 °C
10kW2
Official source
UK

Rules in the UK

Minimum distance to your neighbour

MCS 020(a) (England, permitted development since 29 May 2025)3 · 1 m in front of the centre of a neighbour’s habitable-room door or window

Permitted development (MCS 020(a))≤ 37 dB(A) · LAeq,5min
Free-standing10 m
Against wall14.2 m
In corner20 m

Indicative calculation (hemispherical, no barriers). Not a substitute for an MCS 020 assessment.

Boiler Upgrade Scheme

Check conditions

£7,500 – £9,0004Fixed 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.5,6

  • 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: 3.48. 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)Air-to-water1
Compressors11
Capacity controldrehzahlregelung1
Performance
Rated output 35 °C10 kW2
Rated output 55 °C10 kW2
Efficiency
SCOP (35 °C)4.732
SCOP (55 °C)3.482
Seasonal efficiency ηs 35 °C186 %2
Seasonal efficiency ηs 55 °C136 %2
Energy label 35 °CA+++2
Energy label 55 °CA++2
COP A7/W354.671
COP A2/W354.061
COP A-7/W353.481
Noise
Outdoor unit sound power65 dB(A)2
Refrigerant
RefrigerantR321
Refrigerant charge1.6 kg1
Electrical
Max. power input3.3 kW1
Connectivity & smart
SG ReadyYes1

How it ranks

SCOP (35 °C): better than 39% of comparable models in our database (Heat pumps · Air-to-water · 10–14 kW; n = 308).

Rank 176 of 309

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 Sunex

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Guides on heat pumps

How we collect and check this data →

Frequently asked questions

Can I install the Sunex Nexus M13 EVI without planning permission?

Under MCS 020(a) (England, permitted development since 29 May 2025) the unit must not exceed 37 dB(A) 1 m in front of the centre of a neighbour’s habitable-room door or window. With a sound power of 65 dB(A) that indicatively means 10.0 m free-standing, 14.2 m against a wall or 20.0 m in a corner. Your MCS installer must confirm this.1,2

How much Boiler Upgrade Scheme grant can you get for the Sunex Nexus M13 EVI?

£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

Which refrigerant does the Sunex Nexus M13 EVI use?

The Sunex Nexus M13 EVI uses R32.1,2

Sources

  1. List of eligible heat pumps (BEG) — Bundesamt für Wirtschaft und Ausfuhrkontrolle (BAFA) · accessed 29 Sept 2026
  2. European Product Registry for Energy Labelling (EPREL) – heat pumps — Europese Commissie · accessed 15 Oct 2026
  3. MCS 020(a) (England, permitted development since 29 May 2025)
  4. Boiler Upgrade Scheme: what you can get — GOV.UK · accessed 27 Sept 2026
  5. Boiler Upgrade Scheme: guidance for installers (V5) — Ofgem · accessed 27 Sept 2026
  6. Boiler Upgrade Scheme product eligibility — Ofgem · accessed 27 Sept 2026