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Select up to 4 generators to compare specs, power output, noise levels, runtime and more. Your compare URL is shareable.

  • Firman H07552
  • Genmax GM6000iED
  • Model H07552
    Model H07552

    Firman 7,500W Dual-Fuel Generator

    7500W
    Running
    74 dB
    Noise
    View details
  • Model GM6000iED
    Model GM6000iED

    Genmax 5,250W Dual-Fuel Generator

    5250W
    Running
    63 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 H07552Genmax GM6000iED
General
Product type
Generator
Generator
Fuel
Dual-Fuel
Dual-Fuel
InverterNoYes
Parallel capableNoNo
RV readyYesNo
Running watts
Winner: Winner: 7500 W
5250 W
Starting watts
Winner: Winner: 9400 W
6000 W
Noise (lower limit)
74 dB
Winner: Winner: 63 dB
Weight
212 lbs
Winner: Winner: 117.9 lbs
Run time @50% load
Winner: Winner: 12 h
8.5 h
Run time @25% load
12 h
13 h
Fuel tank
8 gal
3.8 gal
Fuel gaugeYesYes
Approx. dimensions (L × W × H)
30.2 x 27.5 x 26.3
24 x 18.5 x 21.1
Electrical
Voltage (AC)
120/240V 60 Hz
120/240
Voltage (DC)
Not available
5
GFCI outletsYesYes
Covered outletsYesYes
Automatic Voltage RegulationYesYes
THD
25 %
<3% %
Engine
Engine
439 cc Firman Max-Pro Series OHV 4-stroke, cast iron sleeve
312 cc OHV 4-stroke
Alternator
Not available
Not available
Starting system
Recoil, Electric
Recoil, Electric, Remote
Warranty
Warranty
3 years
1 years
Power by fuel
GasolineNot availableNot available
Running watts
7500 W
5250 W
Starting watts
9400 W
6000 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
12 h
8.5 h
Run time @25% load
Not available
Not available
PropaneNot availableNot available
Running watts
6750 W
4750 W
Starting watts
8450 W
5500 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
5 h
7.9 h
Run time @25% load
Not available
Not available
Other
Data center
Not available
Not available
Indicators
false
true
Compliance
CARB, EPA
EPA, ANSI/PGMA G300-2023
Security
Not available
Not available
Spark arrestorYesYes
Neutral
true
Not available
UPC
840876175521
713424639038
Core / High-priority specs
Running Watts (Gasoline)
7500
5250
Running Watts (Propane)
6750
4750
Starting Watts (Gasoline)
9400
6000
Starting Watts (Propane)
8450
5500
Runtime @ 50% Load (Gasoline)
12
8.5
Runtime @ 50% Load (Propane)
5
7.9
AC Outlet Types
1x Duplex 120V 20A (5-20R) GFCI; 1x 120V 30A (L5-30R); 1x 120/240V 30A (L14-30R); 1x 120/240V 50A (14-50R)
1x Duplex 120V 20A (5-20R); 1x 120/240V 30A (L14-30R)
Electrical & power
Frequency
60
60
Engine & construction
Engine Type
OHV 4-stroke, cast iron sleeve
OHV 4-stroke
Engine Displacement
439
312
Cylinder Sleeve
cast iron sleeve
Not available
Engine Oil Type
10W-30
10W-30
Runtime & fuel system
Runtime @ 50% Load (Gasoline)
12
8.5
Runtime @ 50% Load (Propane)
5
7.9
Safety & compliance
Overload Protection System
Not available
Low oil and overload protection, CO monitoring
Low Oil ProtectionYesYes
Carbon Monoxide MonitoringNoYes
Included equipment
Mobility Components
Yes
Not available
Starting Components
Not available
Recoil, Electric, Remote
Included Accessories
Not available
Funnel, tool kit, key fob, propane hose, and battery
Warranty & identification
Residential Warranty
Not available
1
Commercial Warranty
Not available
1
Additional specs
Summary
The Firman H07552 is a 7500-watt dual-fuel generator built for job sites, home backup, and extended outdoor use. On gasoline, it delivers 9400 starting watts and 7500 running watts. Switch to propane and output drops to 8450 starting watts and 6750 running watts, a trade-off that extends fuel flexibility but reduces peak capacity. The 439cc cast-iron-sleeve engine runs on either fuel, giving users the ability to source power based on availability and cost. With an 8-gallon tank, this generator runs 12 hours at 25% load on gasoline or 5 hours on propane, meaning refueling intervals depend heavily on fuel choice and load demand. This wattage class powers most household circuits simultaneously. A 7500-watt generator can run a central air conditioning unit (3500 watts), a water heater (4000 watts), and lighting circuits without overload. For contractors, it handles multiple power tools, compressors, and site lighting. The dual-fuel option appeals to users who want propane backup when gasoline becomes scarce or expensive, though the runtime penalty on propane means job-site users will refuel more frequently.
The Genmax GM6000iED is a 5,250-watt dual-fuel inverter generator that handles mid-range backup loads like refrigerators, window air conditioners, and sump pumps simultaneously. Dual-fuel capability lets users switch between gasoline and propane based on availability or storage preference, a practical advantage during prolonged outages. Inverter technology delivers clean power below 3% THD, making it safe for laptops, smartphones, and microprocessor-driven devices without risk of voltage spikes that degrade circuits over time.
  • Most Powerful
    Firman H07552
    7500W running
  • Quietest
    Genmax GM6000iED
    63 dB
  • Longest Runtime
    Firman H07552
    12h at 50% load
Where to buy
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Firman H07552
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Genmax GM6000iED
Store links
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