IGLOO MultiTherma 21 HD + MultiTherma BASIC 16-25 vs Power World PW040-DKZLRS-E1(ODU)
SCOP (35 °C): IGLOO MultiTherma 21 HD + MultiTherma BASIC 16-25 4.29, Power World PW040-DKZLRS-E1(ODU) 5.17. The Power World PW040-DKZLRS-E1(ODU) is better on 9 of 14 comparable points.
Who wins where
- IGLOO MultiTherma 21 HD + MultiTherma BASIC 16-25
- Power World PW040-DKZLRS-E1(ODU)
Biggest differences
| Fact | MultiTherma 21 HD + MultiTherma BASIC 16-25 | PW040-DKZLRS-E1(ODU) |
|---|---|---|
| Refrigerant charge | 2.2 kg | 0.9 kg |
| Heating capacity (A7/W35) | 6.29 kW | 8.09 kW |
| Indoor unit sound power | 29 dB(A) | 37 dB(A) |
| Seasonal efficiency ηs 55 °C | 126 % | 158.9 % |
| SCOP (55 °C) | 3.23 | 4.05 |
| Seasonal efficiency ηs 35 °C | 169 % | 204 % |
Score per area = position (0–100) relative to all 1350 models in this category; higher is better.
| Technical specifications | IGLOOMultiTherma 21 HD + MultiTherma BASIC 16-25 | Power WorldPW040-DKZLRS-E1(ODU) |
|---|---|---|
| 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) | 6.29 kW 2 | 8.09 kW ✓ 3 |
| Rated output 35 °C | 8.42 kW ✓ 1 | 8.26 kW 1 |
| Rated output 55 °C | 8.02 kW 1 | 8.35 kW ✓ 1 |
| Efficiency | ||
| SCOP (35 °C) | 4.29 1 | 5.17 ✓ 1 |
| SCOP (55 °C) | 3.23 1 | 4.05 ✓ 1 |
| Seasonal efficiency ηs 35 °C | 169 % 1 | 204 % ✓ 1 |
| Seasonal efficiency ηs 55 °C | 126 % 1 | 158.9 % ✓ 1 |
| Energy label 35 °C | A, , 2 | A, , , 3 |
| Energy label 55 °C | A, , 2 | A, , , 3 |
| COP A7/W35 | 5.02 1 | 5.05 ✓ 1 |
| COP A2/W35 | 4.25 1 | – |
| COP A-7/W35 | 3.42 ✓ 1 | 3.29 1 |
| Noise | ||
| Outdoor unit sound power | 56 dB(A) 1 | 51 dB(A) ✓ 1 |
| Indoor unit sound power | 29 dB(A) ✓ 1 | 37 dB(A) 1 |
| Refrigerant | ||
| Refrigerant | R290 1 | R290 1 |
| Refrigerant GWP | 3 2 | 3 3 |
| Refrigerant charge | 2.2 kg 1 | 0.9 kg ✓ 1 |
| Electrical | ||
| Max. power input | 6.9 kW 1 | 2.22 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