Mitsubishi Electric MUZ-FX18NLHZ***vsWillis MZUHW18KCH21S2-O
Side-by-side heat pump comparison
Mitsubishi Electric MUZ-FX18NLHZ***
SEER2
25.5BTU/Wh
HSPF2
11.1BTU/Wh
Cooling Capacity
17200BTU/hr
Cold Climate
Yes
Cold climate certified
Willis MZUHW18KCH21S2-O
SEER2
21BTU/Wh
HSPF2
10BTU/Wh
Cooling Capacity
17000BTU/hr
Cold Climate
Yes
Cold climate certified
Key differences
Mitsubishi Electric MUZ-FX18NLHZ*** is 18% more efficient at 25.5 BTU/Wh versus 21.0 BTU/Wh for the Willis MZUHW18KCH21S2-O. The Mitsubishi Electric MUZ-FX18NLHZ*** is larger at 17200 BTU/hr versus 17000 BTU/hr. Mitsubishi Electric MUZ-FX18NLHZ*** uses a lower-impact refrigerant: R-454B (GWP 470) versus R-410A (GWP 2088). Overall, the Mitsubishi Electric MUZ-FX18NLHZ*** sits higher in the category, ranking above 92% of certified air-source heat pumps.
Efficiency
| Spec | Mitsubishi Electric | Willis |
|---|---|---|
| SEER2 (best combination)(BTU/Wh) | 25.5 | 21 |
| SEER2 (worst combination)(BTU/Wh) | 25.5 | 21 |
| HSPF2 (best combination)(BTU/Wh) | 11.1 | 10 |
| HSPF2 (worst combination)(BTU/Wh) | 11.1 | 10 |
| EER2 (best combination)(BTU/Wh) | 13.1 | 12 |
| COP at 5 °F | 2.06 | 2.22 |
Capacity
| Spec | Mitsubishi Electric | Willis |
|---|---|---|
| Cooling Capacity (max)(BTU/hr) | 17200 | 17000 |
| Cooling Capacity (min)(BTU/hr) | 17200 | 17000 |
| Heating at 47 °F(BTU/hr) | 17000 | 18000 |
| Heating at 17 °F(BTU/hr) | 12700 | 15000 |
| Heating at 5 °F(BTU/hr) | 23600 | 13600 |
Configuration
| Spec | Mitsubishi Electric | Willis |
|---|---|---|
| Product Type | HP - Mini or Multi Split | HP - Mini or Multi Split |
| Compressor Staging | Continuously variable | Continuously variable |
| Cold Climate Certified | Yes | Yes |
| Connected Capability | No | No |
| Series | M-Series | MultiHeat |
| Indoor-Unit Combinations Rated | 1 | 1 |
Refrigerant
| Spec | Mitsubishi Electric | Willis |
|---|---|---|
| Type | R-454B | R-410A |
| GWP Rating | R-454B (GWP:470 | Lower GWP) | R-410A (GWP:2088) |