Firman WT06375
Generator · Tri-Fuel Inverter. Specs from the manufacturer page (checked ).

The Firman WT06375 is a tri-fuel inverter portable generator rated at 6300 W running and 7850 W starting on gasoline. It supplies 120/240V AC and runs on gas, liquid propane, or natural gas.
Key features
- 322cc engine with electric start and recoil start
- Running watts 6300W (gas), 5700W (LPG), 4900W (natural gas); starting watts 7850W (gas), 7100W (LPG), 6100W (natural gas)
- 5.3-gallon tank with up to 16 hours of run time at 1/4 load
- Parallel operation
- CO alert technology and low oil shut-off
- Outlets: 5-20R 120V 20A duplex GFCI, TT-30R 120V 30A twistlock, L14-30R 120/240V 30A twistlock, 14-50R 120/240V 50A, USB-C (60W), 12V DC port (100W)
- 67dB at 1/4 load with Eco Mode
- Weight 132 lbs, 3-year warranty
Specifications
| Running watts | 6300 W |
|---|---|
| Peak / surge | 7850 W |
| Fuel | tri-fuel |
| Tank | 20.1 L (5.3 gal) |
| Run time at 50 % load | 16 h |
| Noise | 67 dB |
| AC output voltage | 120/240V |
| Weight | 59.9 kg (132.1 lb) |
| Warranty | 3 years |
From the Firman page. Values the manufacturer does not publish are left out.
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Connection and wiring
Follow the diagrams in the Firman manual. Connecting to a home panel needs a transfer switch or interlock and a licensed electrician.
Error codes and troubleshooting
| Code | Meaning | What to do | Manual page |
|---|---|---|---|
| Circuit Breakers | The receptacles are protected by an AC circuit protector that trips if the generator is overloaded or an external short circuit occurs. | Disconnect all electrical loads and determine the cause before using the generator again. If overloading caused the trip, reduce the load. Reset by pressing the protector button. Continuous tripping may damage the generator or equipment. | 8 |
| Oil Warning Indicator Light | Indicates the oil has fallen below the minimum level. The engine stops automatically and will not start until the proper amount of oil is in the crankcase. | Check the oil level when this light turns on. Add the proper amount of engine oil to the crankcase before attempting to start the engine. | 8 |
| Overload Indicator Light | Connected devices have exceeded the generator's wattage or amperage capacity, or a power surge occurred. The AC Power light goes off, the engine keeps running, and power to the receptacles is cut. | Keep the total power drawn from all receptacles within the nameplate rating. | 8 |
| Circuit Breaker | The receptacles are protected by an AC circuit protector that trips if the generator is overloaded or an external short circuit occurs. | Disconnect all electrical loads and find the cause before using the generator again. If overloading caused the trip, reduce the load. Reset by pressing the button on the protector. Continuous tripping may damage the generator or equipment. | 9 |
| Output Ready | Stays on during normal operation. Turns off when the generator is overloaded. | — | 9 |
| AC Reset | The inverter has entered a protective state and AC output is interrupted. | Press the AC Reset Button to restore the output. | 12 |
6 of 13 codes. From the Firman manual. All 13 WH03242 / T09371 / H07553 / W03083 codes →
FAQ
How long does the Firman WT06375 run on a tank?
The maker rates it at 16 hours at 50 % load (about 3,150 W) on a 5.3-gal tank. A light load such as a refrigerator and lights runs longer; a full load runs shorter.
Can the Firman WT06375 start a sump pump or well pump?
Starting surge matters more than running watts: this unit is rated 7850 W peak. That covers a typical 1/2 HP sump pump (about 2150 W to start). Use the calculator with your exact pump.