SolaX ALT05-SF0 vs TCL THM4DF3dB
SCOP (35 °C): SolaX ALT05-SF0 5.12, TCL THM4DF3dB 5.8. The TCL THM4DF3dB is better on 8 of 14 comparable points.
Who wins where
- SolaX ALT05-SF0
- TCL THM4DF3dB
Biggest differences
| Fact | ALT05-SF0 | THM4DF3dB |
|---|---|---|
| Heating capacity (A7/W35) | 5.3 kW | 4.5 kW |
| COP A-7/W35 | 3.12 | 3.63 |
| Seasonal efficiency ηs 35 °C | 202 % | 229.1 % |
| SCOP (35 °C) | 5.12 | 5.8 |
| Seasonal efficiency ηs 55 °C | 152 % | 171.6 % |
| SCOP (55 °C) | 3.88 | 4.37 |
Score per area = position (0–100) relative to all 1350 models in this category; higher is better.
| Technical specifications | SolaXALT05-SF0 | TCLTHM4DF3dB |
|---|---|---|
| Grants & market | ||
| Boiler Upgrade Scheme | £7,500 – £9,000 | £7,500 – £9,000 |
| General | ||
| Type (source) | Air-to-water 1 | Air-to-water 1 |
| Performance | ||
| Heating capacity (A7/W35) | 5.3 kW ✓ 2 | 4.5 kW 3 |
| Rated output 35 °C | 5 kW 1 | 5.2 kW ✓ 1 |
| Rated output 55 °C | 5 kW 1 | 5.06 kW ✓ 1 |
| Min. outdoor temperature | -22 °C 2 | -22 °C 3 |
| Efficiency | ||
| SCOP (35 °C) | 5.12 1 | 5.8 ✓ 1 |
| SCOP (55 °C) | 3.88 1 | 4.37 ✓ 1 |
| Seasonal efficiency ηs 35 °C | 202 % 1 | 229.1 % ✓ 1 |
| Seasonal efficiency ηs 55 °C | 152 % 1 | 171.6 % ✓ 1 |
| Energy label 35 °C | A, , , 2 | A, , , 3 |
| Energy label 55 °C | A, , , 2 | A, , , 3 |
| COP A7/W35 | 5.1 1 | 5.5 ✓ 3 |
| COP A2/W35 | – | 5.43 1 |
| COP A-7/W35 | 3.12 1 | 3.63 ✓ 1 |
| Noise | ||
| Outdoor unit sound power | 48 dB(A) ✓ 1 | 51 dB(A) 1 |
| Refrigerant | ||
| Refrigerant | R290 1 | R290 1 |
| Refrigerant GWP | 3 2 | 3 3 |
| Refrigerant charge | 0.74 kg ✓ 1 | 0.8 kg 1 |
| Electrical | ||
| Max. power input | 2.55 kW 1 | 2.2 kW 1 |
| Connectivity & smart | ||
| SG Ready | Yes 1 | Yes 1 |
Sources
- List of eligible heat pumps (BEG) — Bundesamt für Wirtschaft und Ausfuhrkontrolle (BAFA) · accessed 27 Sept 2026
- Heat Pump Keymark certificates — EHPA / DIN CERTCO (Heat Pump KEYMARK) · accessed 29 Sept 2026
- Heat Pump Keymark certificates — EHPA / DIN CERTCO (Heat Pump KEYMARK) · accessed 29 Sept 2026