Lennox 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 |
|---|---|---|
| Lennox WHHP050T45MD240S**** | 848 | $178 |
| Lennox WHHP040T45MD240S**** | 915 | $192 |
| Lennox WHHP080T45MD240S**** | 1,210 | $254 |
| Lennox WHHP065T45MD240S**** | 1,225 | $257 |
- Refrigerators
- Freezers
- Washing machines
- Dishwashers
- Tumble dryers
- Room air conditioners
- Dehumidifiers
- Electric cooktops and ranges
- Televisions
- Computers
- Air purifiers
Source: ENERGY STAR (U.S. EPA) · 21.0¢/kWh (August 2026) · Methodology