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Heat pumps · UK

Kermi x-change dynamic eco S

Kermi x-change dynamic eco S
Image: Kermirequest removal

The Kermi x-change dynamic eco S is an air-to-water heat pump with a SCOP of 5.35 (35 °C) and a sound power level of 48 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 1.4 m; against a wall 2.0 m.1,2

Last updated: Technical specificationsRules in the UK⇄ Compare this model
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SCOP (35 °C)
5.352

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

Outdoor unit sound power
48dB(A)2
Official source
Refrigerant
R2901
Official source
Type (source)
Air-to-water1
Official source
Rated output 35 °C
6kW2
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-standing1.4 m
Against wall2 m
In corner2.8 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 6 kW; the scheme covers systems up to 45 kW.
  • SCOP at 55 °C: 4.03. 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 °C6 kW2
Rated output 55 °C6 kW2
Efficiency
SCOP (35 °C)5.352
SCOP (55 °C)4.032
Seasonal efficiency ηs 35 °C211 %2
Seasonal efficiency ηs 55 °C158 %2
Energy label 35 °CA+++2
Energy label 55 °CA+++2
COP A7/W355.481
COP A2/W354.481
COP A-7/W353.391
Noise
Outdoor unit sound power48 dB(A)2
Refrigerant
RefrigerantR2901
Refrigerant charge1.05 kg1
Electrical
Max. power input5.1 kW1
Connectivity & smart
SG ReadyYes1

How it ranks

SCOP (35 °C): better than 92% of comparable models in our database (Heat pumps · Air-to-water · 6–8 kW; n = 182).

Rank 7 of 183

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.

Manufacturer documentation

External links to Kermi's official website. The manufacturer may change or move documents; where they differ, the manufacturer's latest version applies.

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Frequently asked questions

Can I install the Kermi x-change dynamic eco S 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 48 dB(A) that indicatively means 1.4 m free-standing, 2.0 m against a wall or 2.8 m in a corner. Your MCS installer must confirm this.1,2

How much Boiler Upgrade Scheme grant can you get for the Kermi x-change dynamic eco S?

£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 Kermi x-change dynamic eco S use?

The Kermi x-change dynamic eco S uses R290.1,2

Sources

  1. List of eligible heat pumps (BEG) — Bundesamt für Wirtschaft und Ausfuhrkontrolle (BAFA) · accessed 27 Sept 2026
  2. European Product Registry for Energy Labelling (EPREL) – heat pumps — Europese Commissie · accessed 18 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