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YamahaModel EF2800i
Discontinued
Suggested replacement: Yamaha EF3000iS

Yamaha 2,500W Gas Generator Review

The Yamaha EF2800i is a lightweight and quiet inverter generator capable of powering a range of devices, from power tools to sensitive electronics, making it suitable for home backup, job sites, and on-the-go use.

At a Glance

  • Running Watts
    2500W
  • Starting Watts
    2800W
  • Fuel Type
    Gasoline
  • Runtime (25%)
    14.7h
  • Noise Level
    65 dB
  • Weight
    68 lbs

Where to buy

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    Is this the right generator for you?

    Here's the quick tradeoff view — what this model does well, and where it may not fit.

    Pros

    • Inverter system with Pulse Width Modulation (PWM) control
    • Smart Throttle for improved fuel economy and reduced noise
    • Multi-pole alternator for excellent power output to weight ratio
    • GFCI (Ground Fault Interrupter Circuit) for enhanced safety
    • OHV engine with cast iron cylinder lining for durability
    • Oil Watch Warning System to prevent engine damage
    • USFS-approved spark arrestor to reduce fire risk
    • Noise suppressor to minimize electrical interference
    • Specially designed muffler for reduced noise and weight
    • 12-volt DC output for battery charging

    Cons

    • relatively heavy at 68 pounds
    • lacks electric start functionality
    Best use cases
    Sensitive electronics

    Summary

    The Yamaha EF2800i is a gasoline generator rated for 2,500 running watts with 2,800 starting watts. That combination targets steady output for ongoing loads while still giving extra headroom for devices that draw more power at startup.

    Because it is gasoline-fueled, the EF2800i fits users who want a familiar refueling routine while keeping power on tap in a compact generator format.

    Power & Runtime

    With 2,500 running watts and 2,800 starting watts, the EF2800i is built to handle continuous demand and brief startup surges without forcing you to size everything to the higher number. Its inverter design pairs with a 2.5 percent THD rating, which speaks directly to how cleanly it shapes electricity for sensitive electronics that benefit from low distortion.

    Noise is rated at 65 dBA, giving you a concrete reference point for how present the generator will sound while operating. For endurance, Yamaha lists 14.7 hours of runtime at 25 percent load, and the 2.6-gallon fuel tank helps explain how it sustains that lighter-demand operation without frequent refills.

    Portability

    At 68 lbs, the EF2800i stays within a weight range that supports portability for many users who need to move a generator between storage and the point of use. Its physical footprint of 19.2 x 15.6 x 16.7 inches also helps it fit into tighter storage spaces while remaining substantial enough to house its inverter power system.

    Features

    Starting is handled by a recoil system, keeping operation straightforward and mechanical. A built-in fuel gauge supports quick checks on remaining fuel, and the included indicators add at-a-glance status visibility while the generator is running.

    On the protection and regulation side, the EF2800i includes GFCI outlets for added electrical safety and AVR for automatic voltage regulation, both of which contribute to steadier, more controlled output. It is EPA compliant and includes a spark arrestor, and Yamaha backs the unit with a 3-year warranty.

    Recommended Audiences

    • Owners of sensitive electronics seeking clean inverter power
    • Shoppers who prefer gasoline-powered generators
    • Homeowners needing emergency backup for essential circuits
    • Users who need a lightweight, portable power solution
    Updated: Feb 24, 2026

    What this generator can power

    At a Glance

    • Continuous:2,500W(recommended usable: 2,000W)
    • Surge:2,800W
    • Output:120V only
    • Inverter:Yes (clean power for electronics)

    Big-item compatibility

    Refrigerator
    Yes
    Sump Pump (1/3 HP)
    Yes
    Well Pump (1 HP, 240V)
    No

    Needs 240V output

    Furnace Blower
    Yes
    Central AC (3 Ton, 240V)
    No

    Needs 240V output

    Window AC (10,000 BTU)
    Yes
    Electric Water Heater (240V)
    No

    Needs 240V output

    Electric Range/Oven (240V)
    No

    Needs 240V output

    Air Compressor (1 HP)
    Maybe

    May struggle with startup surge

    Example setups

    Essentials

    • Lights + Wi-Fi + Charging
    • Refrigerator
    • Furnace Blower

    Est. running: 1,000W

    Peak surge (single motor): 1,200W

    Avoid starting multiple motor loads at the same time.

    Essentials + Comfort

    • Lights + Wi-Fi + Charging
    • Refrigerator
    • TV + Entertainment System
    • Microwave

    Est. running: 1,900W

    Peak surge (single motor): 1,200W

    Avoid starting multiple motor loads at the same time.

    Jobsite / Tools

    • Lights + Wi-Fi + Charging

    Est. running: 200W

    These are estimates using typical wattage assumptions. Real appliances vary. Startup surges can be 2–6× the running wattage for motor-driven loads. 240V loads require a 120/240V generator and proper connection. Use a transfer switch or interlock kit; never backfeed a panel.

    Yamaha
    ReliabilityAExcellent

    About Yamaha

    Yamaha is a respected leader in the generator industry, recognized for their innovation, quality, and reliability in portable and backup power solutions.

    Founded1953
    HQIwata, Shizuoka, Japan
    Website (opens in a new tab)
    Support1-800-962-7926
    Support / Manuals (opens in a new tab)
    View all Yamaha generators

    Warranty

    Coverage: 3 years

    Power by fuel

    FuelRunningStartingRuntime @50%Runtime @25%
    Gasoline2500W2800W14.7h

    Full Specifications

    Power

    Running Watts2,500 watts
    Starting Watts2,800 watts
    Starting Watts (Gasoline)2,800 W
    Running Watts (Gasoline)2,500 W

    Engine

    EngineYamaha MZ175 OHV 4-stroke
    Engine TypeOHV 4-stroke
    Engine Displacement171 cc
    Spark ArrestorYes
    Emissions ComplianceEPA

    Electrical

    Voltage (AC)120
    Voltage (DC)12
    Running Amps20.8 A
    Peak Amps23.3 A
    AC Frequency60 hz
    Current23.3 amps
    GFCI OutletsYes
    DC Outlets1x 12V 10A receptacle
    AC Outlets1x Duplex 120V 20A (5-20R) GFCI1x 120V 30A (L5-30R)
    Total Harmonic Distortion (THD)2.5 %

    Dimensions

    Dimensions19.2 x 15.6 x 16.7 inches
    Weight68 lbs

    Other

    Automatic Low Oil ShutdownYes
    Emissions ComplianceEPA
    Automatic Voltage RegulationYes
    Automatic Voltage RegulatorYes
    Covered OutletsNo
    Electric StartNo
    Fuel GaugeYes
    Fuel Tank Capacity2.6 gallons
    IndicatorsYes
    InverterYes
    Noise Level65 dBA
    Parallel CapableNo
    Recoil StartYes
    Remote StartNo
    RV ReadyNo
    Starter TypeRecoil
    Starting SystemRecoil
    UPC799,530,396,645
    Warranty3 years
    WheelsNo

    Core

    Fuel TypeGasoline

    Runtime

    Runtime @ 25%14.7 hours
    Runtime @ 25% Load (Gasoline)14.7 hours

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