FIRMAN WT12579 vs Westinghouse iGen12000DFc
Two of the home standby & large portable generators in our best home standby & large portable generators: champion, westinghouse, duromax & firman comparison, lined up spec by spec. Every figure comes from the manufacturer pages linked below, and the scores use the same published formula as the full ranking.
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Best for: 10,000 W tri-fuel inverter at 69 dB
Check price at AmazonBest for: 9,000 W dual-fuel inverter, 19 h at quarter load
Check price at AmazonSpec-by-spec comparison
Green marks the better published figure. "Not listed" means the manufacturer doesn't publish it.
| Spec | FIRMAN WT12579 | Westinghouse iGen12000DFc | Weight |
|---|---|---|---|
| Running watts (best listed fuel)The highest continuous (rated) output the maker lists on any fuel: gasoline for most portables, propane for home standby units. Output on other fuels is in each product's notes. | 10000 W | 9000 W | 35% |
| NoiseThe maker's noise figure in decibels. Champion lists operational volume for its standby units; load and distance otherwise vary by maker. | 69 dBA | Not listed | 15% |
| Runs on natural gasYes for home standby and tri-fuel models that can run on piped natural gas, which avoids refueling in a long outage. | Yes | No | 15% |
| Runtime at 50% load (gasoline)Hours on a full gasoline tank at half load. Home standby units run on piped gas or a propane tank, so they show Not listed and score the category minimum on this criterion; their strength shows in the other criteria. | Not listed | 11 h | 10% |
| Transfer switch / transfer-switch readyYes for home standby kits that include an automatic transfer switch, and portables with a 120/240V L14-30R or 14-50R outlet or a maker 'transfer switch ready' listing. | Yes | Yes | 10% |
| CO shutoffYes when the maker lists automatic carbon monoxide shutoff. Champion's standby pages don't list one, so it shows as Not listed. | Yes | Yes | 10% |
| CARB compliantYes when the maker lists CARB compliance. Not listed counts as no. | Not listed | No | 5% |
| Starting (peak) watts, gasoline | 12,500 W | 12,000 W | info |
| Running watts on propane | 9,000 W | 8,100 W | info |
| Running watts on natural gas | 7,500 W | Not listed | info |
| Fuel tank | 7.1 gal | 7.9 gal | info |
| Outlets | Includes 120/240V L14-30R | Not published by the maker | info |
| Noise basis | 69 dB at 25% load | Not listed | info |
| CO shutoff | FIRMAN CO Alert | CO sensor shutdown | info |
| CARB | Not published by the maker | Not listed | info |
| GenPick score | 4.9/10 | 3.1/10 | 100% |
Where each one comes out ahead
FIRMAN WT12579
Better published figure on: Running watts (best listed fuel), Runs on natural gas.
What we like
Watch out for
- Runtime at 50% load (gasoline) not published by Firman
Westinghouse iGen12000DFc
No scored spec where it is strictly ahead; its case rests on the strengths below.
What we like
Watch out for
- Noise not published by Westinghouse
Verdict
Large inverters. FIRMAN lists 10,000 vs 9,000 W, tri fuel and 69 dB at 25% load; Westinghouse lists 19 vs 16 h at quarter load.
- FIRMAN WT12579: FIRMAN: WT12579
- Westinghouse iGen12000DFc: Westinghouse: iGen12000DFc