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  • ECHO EG-3500
  • Firman T04073
  • Model EG-3500
    Model EG-3500

    ECHO 2,800W Gas Generator

    2800W
    Running
    72 dB
    Noise
    View details
  • Model T04073
    Model T04073

    Firman 4,000W Tri-Fuel Generator

    4000W
    Running
    67 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
SpecificationECHO EG-3500Firman T04073
General
Product type
Generator
Generator
Fuel
Gasoline
Tri-Fuel
InverterNoNo
Parallel capableNoNo
RV readyNoNo
Running watts
2800 W
Winner: Winner: 4000 W
Starting watts
3500 W
Winner: Winner: 5000 W
Noise (lower limit)
72 dB
Winner: Winner: 67 dB
Weight
Winner: Winner: 110 lbs
123.4 lbs
Run time @50% load
10 h
Winner: Winner: 12 h
Run time @25% load
Not available
14 h
Fuel tank
4 gal
5 gal
Fuel gaugeYesYes
Approx. dimensions (L × W × H)
25 x 24.5 x 21.5
29.8 x 27.5 x 26.1
Electrical
Voltage (AC)
120
120/240
Voltage (DC)
Not available
Not available
GFCI outletsYesYes
Covered outletsYesYes
Automatic Voltage RegulationYesYes
THD
Not available
11%-14% %
Engine
Engine
212 cc OHV 4-stroke
223 cc OHV 4-stroke, cast iron sleeve
Alternator
Not available
Not available
Starting system
Recoil
Recoil, Electric
Warranty
Warranty
3 years
3 years
Power by fuel
GasolineNot availableNot available
Running watts
2800 W
4000 W
Starting watts
3500 W
5000 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
10 h
14 h
Run time @25% load
Not available
Not available
Natural gasNot availableNot available
Running watts
Not available
3200 W
Starting watts
Not available
4000 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
Not available
Not available
Run time @25% load
Not available
Not available
PropaneNot availableNot available
Running watts
Not available
3600 W
Starting watts
Not available
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
Not available
9 h
Run time @25% load
Not available
Not available
Other
Data center
Not available
Not available
Indicators
Not available
true
Compliance
CARB, EPA
CARB, EPA, ANSI/PGMA G300-2023
Security
Not available
Not available
Spark arrestorYesYes
Neutral
Bonded to frame
true
UPC
743184017586
840876140734
Core / High-priority specs
Running Watts (Gasoline)
2800
4000
Running Watts (Propane)
Not available
3600
Running Watts (Natural Gas)
Not available
3200
Starting Watts (Gasoline)
3500
5000
Starting Watts (Propane)
Not available
4500
Starting Watts (Natural Gas)
Not available
4000
Runtime @ 50% Load (Gasoline)
10
14
Runtime @ 50% Load (Propane)
Not available
9
AC Outlet Types
2x Duplex 120V 20A (5-20R) GFCI; 1x 120V 30A (L5-30R)
1x Duplex 120V 20A (5-20R) GFCI; 1x 120V 30A (L5-30R); 1x 120/240V 30A (L14-30R)
Electrical & power
Frequency
60
60
Engine & construction
Engine Type
OHV 4-stroke
223 cc OHV 4-stroke
Engine Displacement
212
223
Cylinder Sleeve
Not available
cast iron
Runtime & fuel system
Runtime @ 50% Load (Gasoline)
10
14
Runtime @ 50% Load (Propane)
Not available
9
Safety & compliance
Overload Protection System
Low oil and overload protection
Low oil and overload protection, CO monitoring
Low Oil ProtectionYesYes
Carbon Monoxide MonitoringNoYes
Included equipment
Starting Components
Not available
Recoil, Electric
Included Accessories
Wheel kit
Oil, funnel, tool kit, propane hose, RV adapter, cover, battery, and wheel kit
Warranty & identification
Commercial Warranty
Not available
3
Additional specs
Summary
The ECHO EG-3500 is a 2,800-watt gasoline generator built around a 212 cc OHV 4-stroke engine. At this wattage, it handles essential household loads like refrigerators, sump pumps, and power tools, but cannot run a central air conditioner or multiple high-demand appliances simultaneously. The 3,500-watt peak output gives it a brief surge capacity for motor startup, which matters when powering devices with inrush current demands. ECHO positions this unit for homeowners managing short outages, campers needing overnight power, and contractors powering hand tools on job sites where grid access is unavailable.
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.
  • Most Powerful
    Firman T04073
    4000W running
  • Quietest
    Firman T04073
    67 dB
  • Longest Runtime
    Firman T04073
    12h at 50% load
Where to buy
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ECHO EG-3500
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Firman T04073
Store links
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