NIBE
NIBE S1255
4.5 6kW
A premium Swedish ground-source system with one of the highest SCOPs available and excellent smart controls.
PowerGuide is reader-supported. We may earn a commission from links on this page — it never affects our rankings or what we recommend.
Specifications
| Heat output | 6 kW |
|---|---|
| Efficiency (SCOP) | 4.7 |
| Max flow temp | 65 °C |
| Refrigerant | R407C |
| Noise | 43 dB |
| Warranty | 7 yrs |
Our verdict
About as efficient as home heating gets. If you're committing to groundworks anyway, the S1255's SCOP and controls justify the premium for many self-builders and deep retrofits.
Pros
- Class-leading SCOP up to ~4.7
- Excellent controls
- Premium build
Cons
- Expensive
- Older refrigerant