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  • Firman T04073
  • Powermate PM4500
  • Model T04073
    Model T04073

    Firman 4,000W Tri-Fuel Generator

    4000W
    Running
    67 dB
    Noise
    View details
  • Model PM4500
    Model PM4500

    Powermate 3,600W Gas Generator

    3600W
    Running
    0 dB
    Noise
    View details
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 @50%
h
Running watts by fuel
Shows how output changes across gasoline/propane/natural gas (when available).
Generator Specifications Comparison
SpecificationFirman T04073Powermate PM4500
General
Product type
Generator
Generator
Fuel
Tri-Fuel
Gasoline
InverterNoNo
Parallel capableNoNo
RV readyNoNo
Running watts
Winner: Winner: 4000 W
3600 W
Starting watts
Winner: Winner: 5000 W
4500 W
Noise (lower limit)
Winner: Winner: 67 dB
0 dB
Weight
123.4 lbs
Winner: Winner: 105 lbs
Run time @50% load
12 h
Winner: Winner: 14 h
Run time @25% load
14 h
19 h
Fuel tank
5 gal
5 gal
Fuel gaugeYesYes
Approx. dimensions (L × W × H)
29.8 x 27.5 x 26.1
26.3 x 22.9 x 21.5
Electrical
Voltage (AC)
120/240
120
Voltage (DC)
Not available
Not available
GFCI outletsYesYes
Covered outletsYesYes
Automatic Voltage RegulationYesYes
THD
11%-14% %
Not available
Engine
Engine
223 cc OHV 4-stroke, cast iron sleeve
Generac OHV 4-stroke 224 cc
Alternator
Not available
Not available
Starting system
Recoil, Electric
Recoil
Warranty
Warranty
3 years
3 years
Power by fuel
GasolineNot availableNot available
Running watts
4000 W
3600 W
Starting watts
5000 W
4500 W
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
14 h
14 h
Run time @25% load
Not available
19 h
Natural gasNot availableNot available
Running watts
3200 W
Not available
Starting watts
4000 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
Not available
Not available
PropaneNot availableNot available
Running watts
3600 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
9 h
Not available
Run time @25% load
Not available
Not available
Other
Data center
Not available
Not available
Indicators
true
false
Compliance
CARB, EPA, ANSI/PGMA G300-2023
CARB, EPA
Security
Not available
Not available
Spark arrestorYesYes
Neutral
true
true
UPC
840876140734
696471080346
Core / High-priority specs
Running Watts (Gasoline)
4000
3600
Running Watts (Propane)
3600
Not available
Running Watts (Natural Gas)
3200
Not available
Starting Watts (Gasoline)
5000
4500
Starting Watts (Propane)
4500
Not available
Starting Watts (Natural Gas)
4000
Not available
Runtime @ 50% Load (Gasoline)
14
14
Runtime @ 50% Load (Propane)
9
Not available
Runtime @ 25% Load (Gasoline)
Not available
19
AC Outlet Types
1x Duplex 120V 20A (5-20R) GFCI; 1x 120V 30A (L5-30R); 1x 120/240V 30A (L14-30R)
2x Duplex 120V 20A (5-20R) GFCI1x 120V 30A (L5-30R)
Electrical & power
Frequency
60
60
Engine & construction
Engine Type
223 cc OHV 4-stroke
OHV
Engine Displacement
223
224
Cylinder Sleeve
cast iron
Not available
Engine Oil Type
Not available
10W-30 / SAE 30
Runtime & fuel system
Runtime @ 25% Load (Gasoline)
Not available
19
Runtime @ 50% Load (Gasoline)
14
14
Runtime @ 50% Load (Propane)
9
Not available
Safety & compliance
Overload Protection System
Low oil and overload protection, CO monitoring
Low oil and overload protection
Low Oil ProtectionYesYes
Carbon Monoxide MonitoringYesYes
Included equipment
Starting Components
Recoil, Electric
Not available
Included Accessories
Oil, funnel, tool kit, propane hose, RV adapter, cover, battery, and wheel kit
Oil and wheel kit
Warranty & identification
Commercial Warranty
3
3
Part Number
Not available
P0081200
Additional specs
Summary
The Firman T04073 is a 4,000-watt tri-fuel generator that runs on gasoline, propane, or natural gas. On gasoline, it delivers 5,000 starting watts and 4,000 running watts, enough to power a refrigerator, microwave, and multiple household circuits simultaneously. On propane, output drops to 3,600 running watts, and on natural gas it falls to 3,200 running watts. This fuel flexibility means users can switch between sources based on availability and cost, a significant advantage during extended outages or in remote locations where one fuel type may be scarce. The T04073 targets homeowners, RV owners, and job site operators who need reliable backup power without the commitment to a single fuel source. Its 5-gallon tank runs for 14 hours at 25% load on gasoline, translating to roughly one week of emergency backup if you run it a few hours per day. The unit includes a wheel kit, making it easier to position despite its 123.4-pound weight.
The Powermate PM4500 is a 4500-watt portable generator featuring COsense® Technology for carbon monoxide protection, a Generac® 224CC OHV Engine, and a 19-hour run time at 25% load.
  • Most Powerful
    Firman T04073
    4000W running
  • Quietest
    Firman T04073
    67 dB
  • Longest Runtime
    Powermate PM4500
    14h at 50% load
Where to buy
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Firman T04073
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Powermate PM4500
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