The FIRMAN Gas Portable Generator 15000/12000W Electric Start 120/240V (P12002) is rated 1,500 running watts higher. The DuroMax 13,500 Watt Portable Tri Fuel Inverter Generator - Low THD (XP13500iHT) runs on 3 fuels; the other on 1. The DuroMax 13,500 Watt Portable Tri Fuel Inverter Generator - Low THD (XP13500iHT) is an inverter model; the other is not.
Side by side
| Specification | DuroMax 13,500 Watt Portable Tri Fuel Inverter Generator - Low THD (XP13500iHT) | FIRMAN Gas Portable Generator 15000/12000W Electric Start 120/240V (P12002) |
|---|---|---|
| Brand | DuroMax | FIRMAN |
| Running watts | 10,500 W | 12,000 W |
| Starting watts | 13,500 W | 15,000 W |
| Fuel types | Gasoline, Propane, Natural gas | Gasoline |
| Fuel tank (gasoline) | 8 gal | — |
| Runtime (as stated) | up to 19.9 h | — |
| Noise (as stated) | 66 dB | — |
| Weight | 234 lb | 390 lb |
| Starting system | Push Button | — |
| Inverter | Yes | No |
| Carbon monoxide shutoff | Listed | Listed |
| Parallel capable | — | — |
| Warranty | 5 Years | — |
| Household appliances it can run by watts (calc) | 20 of 20 | 20 of 20 |
| Price per running watt (calc) | $0.29 | $0.25 |
| Price seen | $2,999 | $3,000 |
| Sellers | 1 | 1 |
Highlighted rows differ. Figures come from each product's sources; runtime, recharge and cost rows are Wattstanding calculations using the same method for both.
Which should you choose?
DuroMax 13,500 Watt Portable Tri Fuel Inverter Generator - Low THD (XP13500iHT)
Choose the DuroMax 13,500 Watt Portable Tri Fuel Inverter Generator - Low THD (XP13500iHT) if fuel flexibility matters or you power sensitive electronics.
FIRMAN Gas Portable Generator 15000/12000W Electric Start 120/240V (P12002)
Choose the FIRMAN Gas Portable Generator 15000/12000W Electric Start 120/240V (P12002) if you need more watts at once.
Before you buy either
- Total your loads with the appliance load & runtime calculator.
- Confirm what each seller includes — accessories, software trials and bundles change often.
- Read the limitations on each full reference page.
Wattstanding compares published specifications; we have not tested these products side by side. How we work · Disclosure