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Westinghouse WGen20000c

Ranked #12 of 23 in Best Home Standby & Large Portable Generators: Champion, Westinghouse, DuroMax & FIRMAN (2026). Here is every spec we scored, where it came from, and how it compares.

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#12

Westinghouse WGen20000c

Best for: Most portable output here: 20,000 W with CO sensor

4.8/10

What we like

    Watch out for

    • Noise not published by Westinghouse

    Score breakdown

    Running watts (best listed fuel) 35%
    Noise * 15%
    Runs on natural gas 15%
    Runtime at 50% load (gasoline) 10%
    Transfer switch / transfer-switch ready 10%
    CO shutoff 10%
    CARB compliant 5%

    * Not published by the manufacturer; scored at the lowest published value in this category, so an unpublished figure never outranks a published one.

    Running watts (best listed fuel)20000 W
    NoiseNot listed
    Runs on natural gasNo
    Runtime at 50% load (gasoline)8 h
    Transfer switch / transfer-switch readyYes
    CO shutoffYes
    CARB compliantNo
    Starting (peak) watts, gasoline28,000 W
    Fuel tank17.2 gal
    OutletsTwo Duplex 120V 5-20R, One 120V L5-30, Two 120/240V L14-30R, Two 120/240V 14-50R
    CO shutoffCO sensor shutdown
    PriceCheck price
    Check price at Amazon
    Specs source:

    Westinghouse WGen20000c head-to-head

    Head-to-headChampion 26 kW Whole House Home Standby Generator and 200A Switch with fleX Technology (201614) vs Westinghouse WGen20000c

    How it compares

    Open the full comparison table

    Champion 26 kW Whole House Home Standby Generator and 200A Switch with fleX Technology (201614)
    8.1/10
    #1 · Largest output here: 26 kW on propane
    Champion 22 kW Whole House Home Standby Generator and 200A Switch with aXis Technology (201221)
    7.4/10
    #2 · 22 kW whole-house kit with a 200A switch (aXis)
    Champion 22 kW Whole House Home Standby Generator and 200A Switch with fleX Technology (201016)
    7.4/10
    #3 · 22 kW whole-house kit with a 200A switch (fleX)
    Champion 18 kW Whole House Home Standby Generator and 200A Switch with fleX Technology (201566)
    6.6/10
    #4 · 18 kW whole-house kit at 67 dB(A)
    Champion 14 kW Whole House Home Standby Generator and 200A Switch with aXis Technology (100839)
    6.1/10
    #5 · 14 kW whole-house kit at 62 dB(A)
    Champion 12.5 kW Select Circuit Home Standby Generator and 100A Switch 10 Year Warran (100179)
    5.7/10
    #6 · 12.5 kW select-circuit kit at 63 dB(A)
    Champion 10 kW Whole House Home Standby Generator and 200A Switch with fleX Technology (201597)
    5.3/10
    #7 · 10 kW whole-house kit at 61 dB(A)
    Champion 13,500W Electric Start Tri Fuel Generator (201241)
    5.1/10
    #8 · 13,500 W tri fuel with CO Shield
    Champion 8.5 kW Select Circuit Home Standby Generator and 50A Switch (100177)
    5.1/10
    #9 · Quietest here: 8.5 kW select-circuit kit at 59.5 dB(A)
    FIRMAN WT12579
    4.9/10
    #10 · 10,000 W tri-fuel inverter at 69 dB
    DuroMax XP13000HXT
    4.8/10
    #11 · Tri fuel 10,500 W with CO alert
    Champion 10,000W Electric Start Tri Fuel Generator (201438)
    4.7/10
    #13 · 10,000 W tri fuel with 14-50R
    FIRMAN T09376
    4.6/10
    #14 · 9,200 W tri fuel with 11 h at half load
    DuroMax XP15000HX
    3.8/10
    #15 · 12,000 W dual fuel with CO alert
    Westinghouse WGen14500DFc
    3.8/10
    #16 · 14,500 W dual fuel with CO sensor
    DuroMax DS14000iX
    3.6/10
    #17 · 11,000 W open-frame inverter with 23.3 h at quarter load
    Champion 11,000W Electric Start Dual Fuel Inverter (201417)
    3.5/10
    #18 · 9,000 W dual-fuel inverter at 64 dB(A)
    DuroMax XP13000EH
    3.3/10
    #19 · 10,500 W dual fuel with CO alert
    Champion 11,000W Wireless Start Dual Fuel Generator (201544)
    3.3/10
    #20 · 11,000 W dual fuel with wireless start
    Westinghouse iGen12000DFc
    3.1/10
    #21 · 9,000 W dual-fuel inverter, 19 h at quarter load
    DuroMax XP11000iH
    2.8/10
    #22 · 9,000 W dual-fuel inverter
    Westinghouse ecoGen10000
    2.6/10
    #23 · 7,600 W inverter with 14-50R and L14-30R