ThermiaCalibra RXT 12 230V
The Thermia Calibra RXT 12 230V is a heat pump with SCOP (35 °C) 5.4 and refrigerant R290.1,2
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 11.34 kW; the scheme covers systems up to 45 kW.
- SCOP at 55 °C: 4.2. The installed system needs a SCOP of at least 2.8 (MCS calculation).
Technical specifications
| General | |
|---|---|
| Type (source) | Ground source1 |
| Compressors | 11 |
| Capacity control | Inverter1 |
| Performance | |
| Rated output 35 °C | 11.34 kW1 |
| Rated output 55 °C | 10.23 kW1 |
| Efficiency | |
| SCOP (35 °C) | 5.41 |
| SCOP (55 °C) | 4.21 |
| Seasonal efficiency ηs 35 °C | 208 %1 |
| Seasonal efficiency ηs 55 °C | 160 %1 |
| Noise | |
| Indoor unit sound power | 40 dB(A)1 |
| Refrigerant | |
| Refrigerant | R2901 |
| Refrigerant GWP | 32 |
| Refrigerant charge | 0.52 kg1 |
| Electrical | |
| Max. power input | 4.7 kW1 |
| Connectivity & smart | |
| SG Ready | Yes1 |
| Grants & market | |
| ISDE grant (NL) | 4,575 €2 |
Variants
This model is registered in 4 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:
- Calibra RXT 12 230V
- Calibra RXT 12 400V
- Calibra RXT 12 Duo 230V
- Calibra RXT 12 Duo 400V
Manufacturer documentation
- Product page
- Datasheet / specifications — Thermia Calibra RXT Datasheet
- Brochure / leaflet — Thermia Calibra RXT Brochure
- Manual — Thermia Calibra RXT User Guide
External links to Thermia's official website. The manufacturer may change or move documents; where they differ, the manufacturer's latest version applies.
Frequently asked questions
What is the SCOP (35 °C) of the Thermia Calibra RXT 12 230V?
The SCOP (35 °C) of the Thermia Calibra RXT 12 230V is 5.4.1,2
Which refrigerant does the Thermia Calibra RXT 12 230V use?
The refrigerant of the Thermia Calibra RXT 12 230V is R290.1,2
How much Boiler Upgrade Scheme grant can you get for the Thermia Calibra RXT 12 230V?
£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
- 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 27 Sept 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