FIRMAN T09275

Last updated: October 28, 2026

FIRMAN T09275
4.0/5#18 of 25 in large portable generators
4.0

A large tri-fuel generator for homes with a natural gas line that want transfer-switch backup without storing fuel, at a premium price.

  • 9,200 / 11,400 WRunning / starting
  • Gasoline, propane, natural gasFuel
  • 11 hr at 50% loadRun time
  • Yes, 240 VTransfer switch
  • 217.5 lbWeight
  • $0.19Price / W
Check price at Amazon$1,707.66

Price checked October 28, 2026. As an Amazon Associate we earn from qualifying purchases.

Pros
  • Runs on natural gas from the house line, so it never needs refueling in a long outage
  • 14-50R, L14-30R and L5-30R outlets, so it feeds almost any transfer switch
  • Push-button start, and shuts itself off if carbon monoxide builds up
  • Long gasoline run time from a 9 gal tank
Cons
  • Costs much more than similar-size dual-fuel models
  • Natural gas output drops to 6,900 W
  • Only two household outlets on the panel

How it scores

The rating comes from 7 measured or published factors, each scored 0-100 against fixed reference points for its size. How we rank explains each one.

Specifications

Model numberT09275
Output
Gasoline9,200 W running, 11,400 W starting
Propane8,300 W running, 10,400 W starting
Natural gas6,900 W running, 8,650 W starting
Outlets2 × 120 V, L5-30, L14-30, 14-50
Transfer switch readyYes, 240 V
Price per watt$0.19
Fuel and run time
FuelGasoline, propane, natural gas
Tank9 gal
Run time (gasoline)11 hr at 50% load
Engine459 cc
Noise and safety
Rated noise76 dBA
CO shutoffYes
Build
StartingElectric and recoil
WheelsYes
Dimensions31 x 29.4 x 27 in
Weight217.5 lb
Warranty3 years
Released2022-09

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