The FIRMAN Gas Portable Generator 4550/3650W Remote Start 120/240V (P03631) is rated 450 running watts higher. The WEN DF400iX 4000-Watt Dual Fuel RV-Ready Electric Start Portable Inverter Generator runs on 2 fuels; the other on 1. The WEN DF400iX 4000-Watt Dual Fuel RV-Ready Electric Start Portable Inverter Generator is an inverter model; the other is not.
Side by side
| Specification | FIRMAN Gas Portable Generator 4550/3650W Remote Start 120/240V (P03631) | WEN DF400iX 4000-Watt Dual Fuel RV-Ready Electric Start Portable Inverter Generator |
|---|---|---|
| Brand | FIRMAN | WEN |
| Running watts | 3,650 W | 3,200 W |
| Starting watts | 4,550 W | 4,000 W |
| Fuel types | Gasoline | Gasoline, Propane |
| Fuel tank (gasoline) | — | — |
| Runtime (as stated) | — | — |
| Noise (as stated) | — | — |
| Weight | 119.5 lb | — |
| Starting system | Electric start | — |
| Inverter | No | Yes |
| Carbon monoxide shutoff | Listed | Listed |
| Parallel capable | — | — |
| Warranty | — | — |
| Household appliances it can run by watts (calc) | 19 of 20 | 19 of 20 |
| Price per running watt (calc) | $0.30 | $0.33 |
| Price seen | $1,090 | $1,070 |
| 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?
FIRMAN Gas Portable Generator 4550/3650W Remote Start 120/240V (P03631)
Choose the FIRMAN Gas Portable Generator 4550/3650W Remote Start 120/240V (P03631) if you need more watts at once.
WEN DF400iX 4000-Watt Dual Fuel RV-Ready Electric Start Portable Inverter Generator
Choose the WEN DF400iX 4000-Watt Dual Fuel RV-Ready Electric Start Portable Inverter Generator if fuel flexibility matters or you power sensitive electronics.
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