Lennox Water Heater Manuals
Select your Lennox model number below for installation steps, settings, maintenance schedules, troubleshooting and the full specification sheet. Your model number is printed on the rating plate.
Lennox water heaters by model number
| Model | Description | Certified |
|---|---|---|
| WHHP040T45MD240S | 37-gallon heat pump water heater | February 2026 |
| WHHP050T45MD240S | 45-gallon heat pump water heater | February 2026 |
| WHHP065T45MD240S | 61-gallon heat pump water heater | February 2026 |
| WHHP080T45MD240S | 74-gallon heat pump water heater | February 2026 |