| E | Electric Immersion Thermostat | ES | Electric Surface Thermostat | EGSP | Electric Point-of-use |
|---|---|---|---|---|---|
| ELD | Electric Light Duty | ME | Marathon Electric | MELD | Marathon Electric Light Duty |
| G | Non-Staged Thermostat | GS | Staged Thermostat | TB | Terminal Block |
| EHS | Large Volume Electric Horizontal | FTB | Fused Terminal Block | D | Light Service |
| HE | High Efficiency | SU | Smart Universal (LeakSense) |
|---|---|---|---|
| PV | Power Vent | SS | Smart Shutoff (Leak Guard) |
| PDV | Power Direct Vent | HA | High Altitude |
| X | Xterme, High BTU Input |