01
Feature 01
Three fuel choices
Gasoline, Propane, Natural gas
GENMAX TRI-FUEL
In Stock · Dallas Depot
GENMAX GM12500iET 12500W Tri-Fuel Inverter Generator with CO Shield
$1,439.40
$2,799.00
SAVE 49% ($1,360 OFF)
Commercial Surplus
✓ 0.0 Hrs · Factory Sealed
Unopened Dallas contractor crate backed by our 3-Year Warranty.
Ships Today, Thu, Nov 12
Order in 5h 13m
Free Liftgate Delivery: Tue, Nov 17 – Thu, Nov 19
Free Liftgate
3-Year Warranty
0.0-Hr Sealed
30-Day Returns
Starting watts
12,500 W
On gasoline
Running watts
9,500 W
On gasoline
Fuel
Tri-fuel
Gasoline, Propane, Natural gas
Engine
458 cc
GENMAX · Product Overview
A 458cc tri-fuel inverter with a 50A outlet.
The GM12500iET uses a 458cc engine and a 6.1-gallon tank. On gasoline it is rated at 12,500 starting watts and 9,500 running watts, and it also runs on propane and natural gas from a separate inlet.
-
50A 14-50R Plus 30A and 20A outlets.
-
Up to 10.4 hours On a 6.1-gallon tank at light load.
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CO sensor EPA compliant.
Gasoline Output
12,500 W Starting
9,500 W Running
Highest surge capacity for central HVAC & heavy jobsite motor loads.
Propane (LPG) Output
Starting
Clean Tank Operation
Shelf-stable fuel with zero carburetor gumming during storm storage.
Natural Gas (NG) Output
Starting
Utility Line Ready
Continuous residential utility-line backup with no cans or tanks to refill.
Hardware Breakdown
OEM Commercial Grade
Key Features
02
Feature 02
A panel for different loads
14-50R 50A 120/240V, 30A, 20A, 12V DC, USB
03
Feature 03
Remote and automatic starting
Electric, 2-wire auto start, Bluetooth app, recoil
Core Engineering Highlights
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Industrial Engine: 458cc OHV with domestic parts support.
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Runtime & Acoustics: Up to 10.4 hours at light load.
Factory Data
Ask Dallas Tech Desk →
Technical Specifications
| Specification | Factory Rating |
|---|---|
| Model | GENMAX GM12500iET |
| Type | Inverter generator |
| Fuel | Gasoline, Propane, Natural gas |
| Starting watts | 12,500 W gasoline |
| Running watts | 9,500 W gasoline |
| Engine | 458cc OHV |
| Fuel tank | 6.1 gal |
| Specification | Factory Rating |
|---|---|
| Runtime | Up to 10.4 hours at light load |
| Noise | As low as 62 dBA at 25% load |
| Outlets | 14-50R 50A 120/240V, 30A, 20A, 12V DC, USB |
| Starting | Electric, 2-wire auto start, Bluetooth app, recoil |
| Safety | CO sensor |
| Warranty | 3-year limited, per GENMAX |
GENMAX GM12500iET · Crate Contents
100% Factory Sealed
What's Included in the Box
- GENMAX GM12500iET (Factory Sealed · 0.0 Hrs)
- OEM Quick-Start & Tool Kit
- Operator Manual & Setup Guide
- Serialized 3-Year Warranty Certificate
- Pre-Delivery Inspection (PDI) Record
- Heavy-Duty Transit Crate
Pre-Start Note: Ships dry per DOT rules — add recommended 10W-30 4-stroke oil before first start and operate outdoors 20+ ft from openings.
Serialized Crate Paperwork
Included inside every factory crate · Tap any certificate to inspect
Official Commercial Certifications
3-Year Commercial Warranty
✓ Factory Sealed
Pre-Delivery Inspection (PDI)
✓ 0.00h Verified
EPA & CARB Compliance
✓ 50-State Certified
Depot Quality Standard
✓ Insured Dispatch
Dallas Logistics
$0.00 Freight Included
Free Curbside Liftgate Delivery
Ships insured from 5800 Industrial Blvd, Dallas, TX with free hydraulic liftgate unloading at your driveway.
1
Dallas Depot PDI
Seal verified, pallet-strapped, and dispatched within 1 business day.
2
Live PRO# Tracking
Carrier tracking link and warranty papers emailed on pickup.
3
24-Hr Advance Call
Local terminal calls ahead to schedule your delivery window.
4
Liftgate Unloading
Lowered smoothly to ground level — no dock or forklift needed.
Verified Equipment Owners
✓ 100% Verified Buyers
Customer Reviews (4)
5.0
Based on 4 verified buyers
Customer Delivery & Setup Photos (1)
Mark R.
October 24, 2026 ✓ Verified Purchase · Tyler, TX
★★★★★
Runs whole house including 4-ton AC without flinching
Ordered the Genmax Gm12500Iet 12500W Tri Fuel Inverter Generator after getting tired of sitting in the dark during Gulf storms. Freight delivery arrived on a liftgate truck right onto my concrete driveway. Hooked it into our manual transfer switch with a 50A cord and ran our central 4-ton AC, two refrigerators, well pump, and all household lights. Electric start fired right up on fuel.
David M.
October 12, 2026 ✓ Verified Purchase · Broken Arrow, OK
★★★★★
Clean freight delivery and great build quality
Driver called me 24 hours ahead of time to coordinate delivery. Unit was bolted onto a heavy pallet and wrapped securely. Added oil, connected fuel source, and pushed the start button. Purrs like a kitten and the digital meter makes monitoring voltage and hours simple. Couldn't ask for a better machine at this price point.
Travis H.
September 28, 2026 ✓ Verified Purchase · Ocala, FL
★★★★★
Fuel versatility and clean power output are a lifesaver
The fuel versatility on this Genmax Gm12500Iet 12500W Tri Fuel Inverter Generator was the main selling point for me. Being able to connect directly to propane or natural gas means no more storing 50 gallons of stale gasoline in the garage. Build quality is solid industrial grade and the frame feels bulletproof.
Gary W.
September 15, 2026 ✓ Verified Purchase · Marysville, OH
★★★★★
Remote start key fob works from inside the house
Tested the wireless remote start from about 80 feet away through the back patio door—started immediately. It is surprisingly quiet for an engine of this displacement. Very impressed with the packaging and complete hardware kit included.
Technical & Freight Desk
Questions & Answers
Need transfer-switch sizing, natural gas BTU flow, or liftgate scheduling confirmed before ordering? Talk directly with our Dallas equipment desk.
What fuels does the GM12500iET run on?
It runs on gasoline (12,500 W starting, 9,500 W running), propane, and natural gas.
Can it back up my house?
The 50A 120/240V outlet is the connection normally used with a home transfer switch or interlock kit. Have a licensed electrician size and install that connection.
What are the propane and natural-gas watt ratings?
It runs on both, from a separate inlet. GENMAX publishes the 12,500 / 9,500 watt gasoline rating on this model and does not print separate propane and natural-gas watt figures on the same spec line, so those are not listed here.
How does Free Curbside Liftgate Delivery work?
Ships free from our Dallas depot (5800 Industrial Blvd) via insured LTL freight with a 24-hour advance call and hydraulic liftgate lowering to your driveway.
Why is this unit discounted below standard retail?
We acquire unclaimed contractor freight allocations directly into our Dallas warehouse. Every unit is 100% factory-sealed (0.0 hrs) with our serialized 3-Year Warranty.
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