RemehaEffenca HT 20
The Remeha Effenca HT 20 is an air-to-water heat pump with a SCOP of 5 (35 °C) and a sound power level of 58 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 4.5 m; against a wall 6.3 m.1,2
Key figures
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
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 20 kW; the scheme covers systems up to 45 kW.
- SCOP at 55 °C: 3.85. The installed system needs a SCOP of at least 2.8 (MCS calculation).
Technical specifications
| General | |
|---|---|
| Type (source) | Air-to-water1 |
| Compressors | 11 |
| Capacity control | drehzahlregelung1 |
| Performance | |
| Rated output 35 °C | 20 kW1 |
| Rated output 55 °C | 20 kW1 |
| Efficiency | |
| SCOP (35 °C) | 51 |
| SCOP (55 °C) | 3.851 |
| Seasonal efficiency ηs 35 °C | 197 %1 |
| Seasonal efficiency ηs 55 °C | 151 %1 |
| COP A7/W35 | 4.61 |
| COP A2/W35 | 4.11 |
| COP A-7/W35 | 3.11 |
| Noise | |
| Outdoor unit sound power | 58 dB(A)1 |
| Refrigerant | |
| Refrigerant | R2901 |
| Refrigerant GWP | 32 |
| Refrigerant charge | 4.45 kg1 |
| Electrical | |
| Max. power input | 8 kW1 |
| Connectivity & smart | |
| SG Ready | Yes1 |
| Grants & market | |
| ISDE grant (NL) | 5,725 €2 |
Variants
This model is registered in 2 combinations (for example with a different indoor unit or cylinder) with exactly the same performance. All figures on this page apply to each of these types. The part of the type number that differs is in bold; small differences (e.g. cylinder volume or anode) are listed after it:
- Effenca HT 20
- Effenca HT 20 EC
Manufacturer documentation
External links to Remeha's official website. The manufacturer may change or move documents; where they differ, the manufacturer's latest version applies.
Compare with
Frequently asked questions
Can I install the Remeha Effenca HT 20 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 58 dB(A) that indicatively means 4.5 m free-standing, 6.3 m against a wall or 9.0 m in a corner. Your MCS installer must confirm this.1,2
Sources
- List of eligible heat pumps (BEG) — Bundesamt für Wirtschaft und Ausfuhrkontrolle (BAFA) · accessed 27 Sept 2026
- ISDE heat pump notification code list — Rijksdienst voor Ondernemend Nederland (RVO) · accessed 28 Sept 2026
- MCS 020(a) (England, permitted development since 29 May 2025)
- Boiler Upgrade Scheme: what you can get — GOV.UK · accessed 27 Sept 2026
- Boiler Upgrade Scheme: guidance for installers (V5) — Ofgem · accessed 27 Sept 2026
- Boiler Upgrade Scheme product eligibility — Ofgem · accessed 27 Sept 2026