Sure RD18AY36AJVCvsViessmann D5CSHAH33AAK
Side-by-side heat pump comparison
Sure RD18AY36AJVC
SEER2
15.2–20BTU/Wh
HSPF2
8.1–10BTU/Wh
Cooling Capacity
31000–32800BTU/hr
Cold Climate
Yes
Cold climate certified
Viessmann D5CSHAH33AAK
SEER2
16.7–19.6BTU/Wh
HSPF2
10–10.5BTU/Wh
Cooling Capacity
33000BTU/hr
Cold Climate
Yes
Cold climate certified
Key differences
Both models are closely matched on seer2: 20.0 vs 19.6 BTU/Wh. The Viessmann D5CSHAH33AAK is larger at 33000 BTU/hr versus 32800 BTU/hr.
Efficiency
| Spec | Sure | Viessmann |
|---|---|---|
| SEER2 (best combination)(BTU/Wh) | 20 | 19.6 |
| SEER2 (worst combination)(BTU/Wh) | 15.2 | 16.7 |
| HSPF2 (best combination)(BTU/Wh) | 10 | 10.5 |
| HSPF2 (worst combination)(BTU/Wh) | 8.1 | 10 |
| EER2 (best combination)(BTU/Wh) | 13 | 12 |
| COP at 5 °F | 2.10 | 2 |
Capacity
| Spec | Sure | Viessmann |
|---|---|---|
| Cooling Capacity (max)(BTU/hr) | 32800 | 33000 |
| Cooling Capacity (min)(BTU/hr) | 31000 | 33000 |
| Heating at 47 °F(BTU/hr) | 36000 | 36000 |
| Heating at 17 °F(BTU/hr) | 29800 | 30000 |
| Heating at 5 °F(BTU/hr) | 28200 | 35000 |
Configuration
| Spec | Sure | Viessmann |
|---|---|---|
| Product Type | HP - Split System | HP - Split System |
| Compressor Staging | Continuously variable | Continuously variable |
| Cold Climate Certified | Yes | Yes |
| Connected Capability | Yes | No |
| Series | VANTIX | D5C Series |
| Indoor-Unit Combinations Rated | 176 | 2 |
Refrigerant
| Spec | Sure | Viessmann |
|---|---|---|
| Type | R-454B | R-454B |
| GWP Rating | R-454B (GWP:470 | Lower GWP) | R-454B (GWP:470 | Lower GWP) |