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Heat pumps · UK

CLIVETWiSAN-PMP 1 S 12.1

The CLIVET WiSAN-PMP 1 S 12.1 is an air-to-water heat pump with a SCOP of 4.95 (35 °C) and a sound power level of 68 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 14.2 m; against a wall 20.0 m.1,2

Last updated: Technical specifications Rules in the UK
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SCOP (35 °C)
4.951

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

Outdoor unit sound power
68dB(A)1
Official source
Refrigerant
R2901
Official source
Rated output 35 °C
26kW1
Official source
Rated output 55 °C
26kW1
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-standing 14.2 m
Against wall 20 m
In corner 28.3 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 26 kW; the scheme covers systems up to 45 kW.
  • SCOP at 55 °C: 3.84. The installed system needs a SCOP of at least 2.8 (MCS calculation).
Heat pump grants in the UK explained →

Technical specifications

General
Type Air-to-water1
Compressors 11
Capacity control digital scroll1
Performance
Rated output 35 °C 26 kW1
Rated output 55 °C 26 kW1
Efficiency
SCOP (35 °C) 4.951
SCOP (55 °C) 3.841
Seasonal efficiency ηs 35 °C 194.9 %1
Seasonal efficiency ηs 55 °C 150.7 %1
COP A7/W35 4.771
COP A2/W35 3.71
COP A-7/W35 3.031
Noise
Outdoor unit sound power 68 dB(A)1
Indoor unit sound power 68 dB(A)1
Refrigerant
Refrigerant R2901
Refrigerant GWP 32
Refrigerant charge 2.9 kg1
Electrical
Max. power input 14.5 kW1
Connectivity & smart
SG Ready Yes1
Grants & market
ISDE grant (NL) 6,400 €2

Frequently asked questions

Can I install the CLIVET WiSAN-PMP 1 S 12.1 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 68 dB(A) that indicatively means 14.2 m free-standing, 20.0 m against a wall or 28.3 m in a corner. Your MCS installer must confirm this.1,2

How much Boiler Upgrade Scheme grant can you get for the CLIVET WiSAN-PMP 1 S 12.1?

£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 CLIVET WiSAN-PMP 1 S 12.1 use?

The CLIVET WiSAN-PMP 1 S 12.1 uses R290.1,2

Sources

  1. List of eligible heat pumps (BEG) — Bundesamt für Wirtschaft und Ausfuhrkontrolle (BAFA) · accessed 27 Sept 2026
  2. ISDE heat pump notification code list — Rijksdienst voor Ondernemend Nederland (RVO) · accessed 27 Sept 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