Compare Generators Side-by-Side
Select up to 4 generators to compare specs, power output, noise levels, runtime and more. Your compare URL is shareable.
- Firman WH03662OF
- Predator 72872
Quick charts
Each chart uses its own Y-axis scale (so numbers are comparable within a chart).
Running watts
W
Starting watts
W
Noise
dB
Runtime @25%
h
Running watts by fuel
Shows how output changes across gasoline/propane/natural gas (when available).
| Specification | Firman WH03662OF | Predator 72872 |
|---|---|---|
| General | ||
| Product type | Generator | Generator |
| Fuel | Dual-Fuel | Dual-Fuel |
| Inverter | Yes | Yes |
| Parallel capable | Yes | No |
| RV ready | Yes | No |
| Running watts | 3650 W | Winner: Winner: 3900 W |
| Starting watts | 4500 W | Winner: Winner: 5000 W |
| Noise (lower limit) | 69 dB | Winner: Winner: 61.7 dB |
| Weight | 119 lbs | Winner: Winner: 110 lbs |
| Run time @50% load | Not available | Not available |
| Run time @25% load | Winner: Winner: 25 h | Not available |
| Fuel tank | 6 gal | Not available |
| Fuel gauge | Yes | No |
| Approx. dimensions (L × W × H) | 24.5 x 24.1 x 23 | 25 x 18 x 20.8 |
| Electrical | ||
| Voltage (AC) | 120 | 120V |
| Voltage (DC) | 12 | Not available |
| GFCI outlets | No | No |
| Covered outlets | Yes | No |
| Automatic Voltage Regulation | Yes | No |
| THD | <3% % | Not available |
| Engine | ||
| Engine | 208 cc OHV 4-stroke, cast iron sleeve | Not available |
| Alternator | Not available | Not available |
| Starting system | Recoil, Electric | Not available |
| Warranty | ||
| Warranty | 3 years | Not available |
| Power by fuel | ||
| Gasoline | Not available | Not available |
| Running watts | 3650 W | Not available |
| Starting watts | 4500 W | Not available |
| Running amps (120V) | Not available | Not available |
| Running amps (240V) | Not available | Not available |
| Peak amps (120V) | Not available | Not available |
| Peak amps (240V) | Not available | Not available |
| Run time @50% load | Not available | Not available |
| Run time @25% load | 25 h | Not available |
| Propane | Not available | Not available |
| Running watts | 3300 W | Not available |
| Starting watts | 4100 W | Not available |
| Running amps (120V) | Not available | Not available |
| Running amps (240V) | Not available | Not available |
| Peak amps (120V) | Not available | Not available |
| Peak amps (240V) | Not available | Not available |
| Run time @50% load | Not available | Not available |
| Run time @25% load | 19 h | Not available |
| Other | ||
| Data center | Not available | Not available |
| Indicators | true | Not available |
| Compliance | CARB, EPA, ANSI/PGMA G300-2023 | Not available |
| Security | Not available | Not available |
| Spark arrestor | Yes | No |
| Neutral | Floating | Not available |
| UPC | 840876136621 | Not available |
| Core / High-priority specs | ||
| Running Watts (Gasoline) | 3650 | Not available |
| Running Watts (Propane) | 3300 | Not available |
| Starting Watts (Gasoline) | 4500 | Not available |
| Starting Watts (Propane) | 4100 | Not available |
| Runtime @ 25% Load (Gasoline) | 25 | Not available |
| Runtime @ 25% Load (Propane) | 19 | Not available |
| AC Outlet Types | 1x Duplex 120V 20A (5-20R); 1x 120V 30A (L5-30R); 1x 120V 50A (14-50R) | Not available |
| Electrical & power | ||
| Frequency | 60 | Not available |
| Engine & construction | ||
| Engine Type | OHV 4-stroke | Not available |
| Engine Displacement | 208 | 224 |
| Runtime & fuel system | ||
| Runtime @ 25% Load (Gasoline) | 25 | Not available |
| Safety & compliance | ||
| Low Oil Protection | Yes | Yes |
| Carbon Monoxide Monitoring | Yes | Yes |
| Included equipment | ||
| Included Accessories | Oil, funnel, tool kit, propane hose, RV adapter, battery charging cables, battery, and wheel kit | Not available |
| Warranty & identification | ||
| Commercial Warranty | 3 | Not available |
| Additional specs | ||
| Summary | The Firman WH03662OF is a 3,650-watt dual-fuel inverter generator built for both home backup and job site work. On gasoline, it delivers 4,500 starting watts and 3,650 running watts. On propane, output drops to 4,100 starting and 3,300 running watts. This wattage range powers most household appliances, mid-size power tools, and multiple devices simultaneously. The dual-fuel option gives users flexibility during fuel shortages or when propane's longer shelf life matters.
Because the WH03662OF runs at 69 dBA, placement within 20 to 30 feet of living spaces remains practical for residential use. The inverter produces less than 3% THD, which protects laptops, TVs, and other sensitive electronics from voltage spikes. A 6-gallon tank delivers 25 hours of runtime at 25% load on gasoline and 19 hours on propane. At 50% load, runtime drops to zero hours, meaning users refuel frequently under moderate-to-heavy demand. | The PREDATOR® 5000 Watt Dual-Fuel SUPER QUIET™ Inverter Generator with CO SECURE® offers dual-fuel capability, running on gasoline or propane. Powered by a reliable 224cc gas engine, it features a TT-30 RV outlet and an extra-large fuel tank, delivering over 18 hours of runtime. The push-button electric start and remote starting option provide convenience, making it ideal for RVs, home backup, and outdoor recreation. |
- Most PowerfulPredator 728723900W running
- QuietestPredator 7287261.7 dB
- Longest Runtimeh at 50% load
Where to buy
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Firman WH03662OF
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Predator 72872
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