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Heat pumps · UK

RatiothermWP Max-AirMono F67

The Ratiotherm WP Max-AirMono F67 is an air-to-water heat pump with a SCOP of 4.88 (35 °C) and a sound power level of 56.1 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 3.6 m; against a wall 5.1 m.1

Last updated: Technical specifications Rules in the UK
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SCOP (35 °C)
4.881

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

Outdoor unit sound power
56.1dB(A)1
Official source
Refrigerant
R2901
Official source
Rated output 35 °C
76.9kW1
Official source
Rated output 55 °C
62.4kW1
Official source
UK

Rules in the UK

Minimum distance to your neighbour

MCS 020(a) (England, permitted development since 29 May 2025)2 · 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 3.6 m
Against wall 5.1 m
In corner 7.2 m

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

Boiler Upgrade Scheme

Not eligible

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 76.9 kW; the scheme covers systems up to 45 kW.
  • SCOP at 55 °C: 4.04. 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 21
Capacity control Inverter1
Performance
Rated output 35 °C 76.9 kW1
Rated output 55 °C 62.4 kW1
Efficiency
SCOP (35 °C) 4.881
SCOP (55 °C) 4.041
Seasonal efficiency ηs 35 °C 192.2 %1
Seasonal efficiency ηs 55 °C 158.6 %1
COP A7/W35 4.811
COP A2/W35 4.151
COP A-7/W35 3.131
Noise
Outdoor unit sound power 56.1 dB(A)1
Indoor unit sound power 30 dB(A)1
Refrigerant
Refrigerant R2901
Refrigerant charge 4.9 kg1
Electrical
Max. power input 36 kW1
Connectivity & smart
SG Ready No1

Frequently asked questions

Can I install the Ratiotherm WP Max-AirMono F67 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 56.1 dB(A) that indicatively means 3.6 m free-standing, 5.1 m against a wall or 7.2 m in a corner. Your MCS installer must confirm this.1

How much Boiler Upgrade Scheme grant can you get for the Ratiotherm WP Max-AirMono F67?

Probably none. Rated output 76.9 kW; the scheme covers systems up to 45 kW.1

Which refrigerant does the Ratiotherm WP Max-AirMono F67 use?

The Ratiotherm WP Max-AirMono F67 uses R290.1

Sources

  1. List of eligible heat pumps (BEG) — Bundesamt für Wirtschaft und Ausfuhrkontrolle (BAFA) · accessed 27 Sept 2026
  2. MCS 020(a) (England, permitted development since 29 May 2025)
  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