The DuroMax XP13500iHT is a tri-fuel inverter generator designed for home backup power, jobsite use, and off-grid or recreational power where fuel flexibility matters. Model XP13500iHT puts out 13,500 peak watts and 10,500 running watts on gasoline, 12,750 peak and 10,000 running watts on propane, and 11,500 peak and 9,000 running watts on natural gas, all from the same 550cc DuroMax 4-stroke OHV engine. That three-fuel capability is the headline feature: if gasoline is scarce after a storm or propane delivery is delayed, this generator switches to whichever fuel you have on hand, including a direct natural gas line for a semi-permanent standby setup.

Inverter generators trade raw size for clean power, and the XP13500iHT holds total harmonic distortion under 3% across all three fuel types. That matters if you're running anything with a circuit board — laptops, phone chargers, a sump pump controller, a CPAP machine, or a refrigerator's compressor board. A worksite generator with a dirty sine wave can damage that kind of equipment over time; this one won't. Noise stays under 66 decibels at 25% load thanks to a demand-based variable idle system that throttles the engine down when the connected load is light, instead of running wide open regardless of draw.

Starting is push-button electric from the control panel or from the included remote control, backed up by a recoil pull-start if the battery ever runs down. The 12-volt AGM battery is included, along with a battery tender to keep it topped off in storage, which solves the classic generator problem of a dead battery the one time you actually need to start the thing. An automatic low-oil shutdown protects the engine, and a built-in carbon monoxide sensor shuts the unit down if CO levels climb too high in an enclosed or poorly ventilated space.

The power panel carries two 5-20R household outlets, a 30-amp L14-30R twist-lock for RV shore power, and a 50-amp 14-50R outlet built for home backup through a transfer switch or interlock kit, and every outlet is GFCI protected. The generator also outputs DC power for charging 48V and 52V battery banks, which extends its use beyond straight AC circuits into whole-home battery backup systems. A digital voltmeter, hour meter, and fuel gauge on the panel let you track output and maintenance intervals without guesswork. The frame runs on a metal-hub wheel kit with a fold-down handle, since a fully fueled 13,500-watt generator is not something you want to carry.

This is the generator for someone who wants one box to cover storm season, weekend camping, and a jobsite trailer, without being locked into a single fuel supply chain. It's built for homeowners setting up whole-home backup, contractors who need power where the grid doesn't reach, and anyone who has been burned before by a generator that only runs on the one fuel that happened to be unavailable that week. DuroMax backs it with a 5-year parts and technical service warranty supported by a nationwide network of service centers.

One Generator, Any Fuel You've Got

The XP13500iHT is the generator to buy if you never want to be stuck waiting on a fuel truck again.

• Who it's for: Homeowners setting up whole-home backup, contractors who need real power on a jobsite trailer, and anyone who wants one generator that isn't dependent on a single fuel supply chain.
• Why it stands out: Tri-fuel flexibility plus sub-3% THD means it's clean enough for electronics and versatile enough to run on whatever fuel is actually available during an outage.
• Worth knowing: Output drops on natural gas compared to gasoline, so size your backup circuits to the NG numbers if that's your primary fuel plan.

• Can I run the XP13500iHT straight off my home's natural gas line? Yes. It's rated for a natural gas supply of 6 to 9 inches of water column and includes a 15-foot hose with a quick connect fitting, delivering 11,500 peak and 9,000 running watts on NG.
• Does it come with a battery? Yes, a 12V AGM battery is included along with a battery tender to keep it charged in storage.
• What's the difference between the XP13500iHT and the XP13500iH? The XP13500iHT adds natural gas as a third fuel option on top of gasoline and propane; the XP13500iH runs on gasoline and propane only. Both share the same 550cc engine, wattage on gas and propane, outlets, and 5-year warranty.
• Can I use this for home backup without a transfer switch? The 14-50R 50A outlet is designed to connect to an interlock kit or transfer switch for backing up circuits in your home; a transfer switch or interlock kit is not included and is sold separately.