Kronoterm ETERA S-1 HT / HK UF E (W/W)
The Kronoterm ETERA S-1 HT / HK UF E (W/W) is a heat pump with SCOP (35 °C) 7.55 and refrigerant R452B.1,2
Key figures
Rules in the UK
Boiler Upgrade Scheme
Check conditions£7,500 – £9,0003Fixed 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.4,5
- Must be MCS-certified (product and installer). Check the Ofgem product eligibility list.
- Rated output 9 kW; the scheme covers systems up to 45 kW.
- SCOP at 55 °C: 5.25. The installed system needs a SCOP of at least 2.8 (MCS calculation).
Technical specifications
| General | |
|---|---|
| Type (source) | Water-to-water1 |
| Performance | |
| Rated output 35 °C | 9 kW2 |
| Rated output 55 °C | 9 kW2 |
| Efficiency | |
| SCOP (35 °C) | 7.552 |
| SCOP (55 °C) | 5.252 |
| Seasonal efficiency ηs 35 °C | 299 %2 |
| Seasonal efficiency ηs 55 °C | 207 %2 |
| Energy label 35 °C | A+++2 |
| Energy label 55 °C | A+++2 |
| Noise | |
| Indoor unit sound power | 32 dB(A)2 |
| Refrigerant | |
| Refrigerant | R452B1 |
| Refrigerant GWP | 6751 |
| Grants & market | |
| ISDE grant (NL) | 4,425 €1 |
Manufacturer documentation
External links to Kronoterm's official website. The manufacturer may change or move documents; where they differ, the manufacturer's latest version applies.
Similar models
Other brands, same type and a comparable size.
More from Kronoterm
- Kronoterm ETERA S-1 HT / HK UF E (B/W) SCOP (35 °C): 5.33
- Kronoterm ETERA S-1 HT / HK UF E SCOP (35 °C): 7.68
- Kronoterm ADAPT 0312-K3 HT / HK 3F SCOP (35 °C): 4.79
- Kronoterm ADAPT 0312-K3 HT / HK 1F SCOP (35 °C): 4.92
- Kronoterm ADAPT 0416-K3 HT / HK 3F SCOP (35 °C): 5.1
- Kronoterm ADAPT 0416-K3 HT / HK 1F SCOP (35 °C): 5
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How we collect and check this data →
Frequently asked questions
What is the SCOP (35 °C) of the Kronoterm ETERA S-1 HT / HK UF E (W/W)?
The SCOP (35 °C) of the Kronoterm ETERA S-1 HT / HK UF E (W/W) is 7.55.1,2
Which refrigerant does the Kronoterm ETERA S-1 HT / HK UF E (W/W) use?
The refrigerant of the Kronoterm ETERA S-1 HT / HK UF E (W/W) is R452B.1,2
How much Boiler Upgrade Scheme grant can you get for the Kronoterm ETERA S-1 HT / HK UF E (W/W)?
£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
Sources
- ISDE heat pump notification code list — Rijksdienst voor Ondernemend Nederland (RVO) · accessed 28 Sept 2026
- European Product Registry for Energy Labelling (EPREL) – heat pumps — Europese Commissie · accessed 15 Oct 2026
- 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