Same comparison covered from Stiebel perspective.
| EcoSmart ECO 27 | Stiebel Tempra 29 Plus | |
|---|---|---|
| Modulation | Constant power | Flow Control |
| Heat exchanger warranty | Lifetime (residential) | 7 years |
| Cold-climate performance | Output drops at peak | Maintains temp |
| Typical price | $549-699 | $849-1,049 |
EcoSmart for Sun Belt + warranty priority; Stiebel for cold climate + Flow Control.