Which generator delivers more running wattage, the GM12000iET or the iGen8200TFc?

Genmax GM12000iET delivers higher continuous output with 9000 running watts on gasoline.

Is the GM12000iET quieter than the iGen8200TFc?

Westinghouse iGen8200TFc is quieter at 50% load, measured at 68.5 dBA at 23 feet.

Which model is better suited for a whole home transfer switch interlock?

Genmax GM12000iET features a factory floating neutral ready for standard transfer switch hookup without modification.

ReaLoadREVIEWS

Home Backup & Portable Power Guide

ReaLoad Engineering Benchmark

Genmax GM12000iET vs. Westinghouse iGen8200TFc

Highlight Differences

Fuel Benchmark:

Elevation:

ReaLoad Technical Verdict & Engineering Dossier

Motor Surge & HVAC Starting

Genmax GM12000iET delivers 12,000W surge, sufficient for a 3.5-Ton central A/C with soft-starter. Inverters under 7,500W surge will trip breaker overcurrent protection on direct compressor starts.

72-Hour Fuel Logistics

At 50% load over 72 hours, continuous gasoline generators consume ~56 gallons (11x 5-gallon cans). Direct utility Natural Gas hookup eliminates fuel storage degradation, winter freezing, and gas station queues.

NEC 250.20 Neutral Bonding

Genmax has factory floating neutral, safely compliant with 3-pole transfer switches and manual panel interlocks without ground loop faults.

Natural Gas Leader

Genmax GM12000iET

7,400 W running on NG (+2120 W lead)

Acoustic Winner

Westinghouse iGen8200TFc

65.5 dBA at 23ft (-0.5 dBA quieter)

Easiest Home Hookup

Genmax GM12000iET

Floating Neutral (Home Interlock Ready)

Best $/Running Watt

Westinghouse iGen8200TFc

$0.19/W ($1,249)

Technical Specification	Enclosed Inverter Genmax GM12000iET $1,899Read Review	Open-Frame Inverter Westinghouse iGen8200TFc $1,249Read Review
Running Watts Power Output	9,000 WBest	6,600 W
Peak Starting Surge Power Output	12,000 WBest	8,200 W
240V Output Amps Power Output	37.5 ABest	27.5 A
Sine Wave Purity Power Quality	<2.3% THD (Pure Sine)Best	<2.3% THD (Pure Sine)Best
Fuel Burn (25%) Fuel Consumption	0.58 GPH	0.37 GPHBest
Fuel Burn (50%) Fuel Consumption	1.05 GPH	0.59 GPHBest
Runtime (25% Load) Fuel Consumption	12 Hours	14.5 HoursBest
Fuel Tank Capacity Fuel Consumption	7.2 GallonsBest	5.3 Gallons
14-50R 50A Outlet Outlets & Receptacles	1x NEMA 14-50R (50A)Best	None (Use Adapter)
L14-30R 30A Outlet Outlets & Receptacles	1x NEMA L14-30R (30A)Best	1x NEMA L14-30R (30A)Best
TT-30R RV Outlet Outlets & Receptacles	NoneBest	NoneBest
5-20R Duplex Outlets Outlets & Receptacles	2x NEMA 5-20R DuplexBest	2x NEMA 5-20R DuplexBest
Engine Start Method Starting & Safety	Wireless Remote, Electric Key & Recoil	Wireless Remote, Electric Key & Recoil
Carbon Monoxide Sensor Starting & Safety	CO Watchdog / Shield Sensor (ANSI/PGMA G300)	CO Watchdog / Shield Sensor (ANSI/PGMA G300)
Noise Level (23ft) Acoustics & Physical	66 dBA	65.5 dBABest
Chassis Dimensions Acoustics & Physical	31.5" L × 23.5" W × 27" H	27.8" L × 22.8" W × 24.5" H
Dry Weight Acoustics & Physical	195 lbs	144 lbsBest
Neutral Bonding NEC 2026 Hookup	Floating Neutral (Ready for Home Interlock)	Bonded Neutral (Unbonding Required for Home ATS)
Verified Street Price Cost & Value	$1,899.00	$1,249.00Best

ReaLoad Technical Verdict Dossier

Motor Inrush Starting Surge

The Genmax GM12000iET delivers 12000W peak surge compared to 8200W on the Westinghouse iGen8200TFc. Starting a 3.5-ton central air conditioner requires an electronic soft-starter to reduce compressor inrush below breaker trip thresholds.

72-Hour Outage Fuel Logistics

At 50% electrical load over a 72-hour power outage, GM12000iET consumes about 76 gallons while iGen8200TFc burns 42 gallons. Homeowners need 16 sealed 5-gallon gasoline cans or utility natural gas.

Home Panel Interlock Safety

Genmax GM12000iET provides a factory floating neutral ready for standard 3-pole manual transfer switches. Follow NEC 250.20 safety grounding rules.

Head-to-Head Telemetry Comparison

Specification	Genmax GM12000iET	Westinghouse iGen8200TFc
Running Watts (Gasoline)	9000W	6600W
Peak Watts (Gasoline)	12000W	8200W
Operating Noise @ 23ft	69.5 dBA	68.5 dBA
Factory Neutral Status	Floating Neutral	Bonded Neutral
Dry Weight	195 lbs	144 lbs
Verified Street Price	$1899	$1249