RELIANCE WATER HEATERS Water heaters: energy use and running cost
The average model uses 1,080 kWh a year, which costs $227 a year at 21.0¢/kWh.
Most efficient models
| Model | kWh/year | Cost/year |
|---|
| RELIANCE WATER HEATERS 10-50-DHPTS 2** | 831 | $175 |
| RELIANCE WATER HEATERS 10-50-DHPTA 2** | 883 | $186 |
| RELIANCE WATER HEATERS 10-40-DHPTA 2** | 902 | $190 |
| RELIANCE WATER HEATERS 10-50-DHPHTCTA 1** | 902 | $190 |
| RELIANCE WATER HEATERS 10-50-DHPHTNE 1** | 902 | $190 |
| RELIANCE WATER HEATERS RHPCO-45 1**+RXST-50LBG 1** | 915 | $192 |
| RELIANCE WATER HEATERS RHPCO-45 1**+RXST-50S 1** | 923 | $194 |
| RELIANCE WATER HEATERS RHPCO-45 1**+RXST-50SG 1** | 923 | $194 |
| RELIANCE WATER HEATERS RHPCO-45 1**+RXST-50T 1** | 923 | $194 |
| RELIANCE WATER HEATERS RHPCO-45 1**+RXST-50TG 1** | 923 | $194 |
| RELIANCE WATER HEATERS 6-50-DHPHT 1** | 970 | $204 |
| RELIANCE WATER HEATERS 10-66-DHPTS 2** | 1,233 | $259 |
| RELIANCE WATER HEATERS 10-80-DHPTA 2** | 1,279 | $269 |
| RELIANCE WATER HEATERS 10-80-DHPTS 2** | 1,279 | $269 |
| RELIANCE WATER HEATERS 10-66-DHPTA 2** | 1,292 | $272 |
| RELIANCE WATER HEATERS RHPCO-45 1**+RXST-80 1** | 1,306 | $274 |
| RELIANCE WATER HEATERS RHPCO-45 1**+RXST-80G 1** | 1,306 | $274 |
| RELIANCE WATER HEATERS RHPCO-45 1**+RXST-66 1** | 1,341 | $282 |
| RELIANCE WATER HEATERS RHPCO-45 1**+RXST-66G 1** | 1,341 | $282 |
| RELIANCE WATER HEATERS 10-66-DHPHTCTA 1** | 1,381 | $290 |
| RELIANCE WATER HEATERS 10-66-DHPHTNE 1** | 1,381 | $290 |
| RELIANCE WATER HEATERS 10-80-DHPHTCTA 1** | 1,387 | $291 |
| RELIANCE WATER HEATERS 10-80-DHPHTNE 1** | 1,387 | $291 |
| RELIANCE WATER HEATERS 6-66-DHPHT 1** | 1,391 | $292 |
| RELIANCE WATER HEATERS 6-80-DHPHT 1** | 1,396 | $293 |
| RELIANCE WATER HEATERS 10-50-DHPTV 2** | 1,550 | $326 |
| RELIANCE WATER HEATERS 10-66-DHPTV 2** | 1,550 | $326 |
| RELIANCE WATER HEATERS 10-80-DHPTV 2** | 1,654 | $348 |
Source: ENERGY STAR (U.S. EPA) · 21.0¢/kWh (August 2026) · Methodology