Mitsubishi Ecodan vs Octopus Cosy 6
A side-by-side look at the Mitsubishi Ecodan and Octopus Cosy 6. Winning figures are highlighted.
| Mitsubishi Electric Mitsubishi Ecodan | Octopus Energy Octopus Cosy 6 | |
|---|---|---|
| Price from | n/a | n/a |
| Heat output | 8.5 kW | 6 kW |
| Efficiency (SCOP) | 3.9 | 4.1 |
| Max flow temp | 60 °C | 65 °C |
| Refrigerant | R290 | R290 |
| Noise | 45 dB | 42 dB |
| Min operating temp | -25 °C | -20 °C |
| Type | Monobloc | Monobloc |
| Warranty | 7 yrs | 7 yrs |
Best value per row highlighted. Prices last checked 15 October 2026.
Mitsubishi Ecodan
If you want the safe, widely-supported choice, the Ecodan is it. You'll never struggle to find an installer or parts. Slightly lower flow temperature than the Vaillant, so radiator sizing matters.
Full Mitsubishi Ecodan reviewOctopus Cosy 6
The value disruptor. Octopus's bundled install plus the grant can make a heat pump astonishingly cheap, and the Cosy 6 itself is a capable R290 unit. Best if you're an Octopus customer.
Full Octopus Cosy 6 review