Which is better for RV use?

Both have a 30A RV receptacle. The Westinghouse gives 3,900 running watts on gas and can run on propane; the FlexPower gives 3,600 W and is 24 lb lighter to load.

Is the Westinghouse worth $150 more?

Yes if you want propane, remote start, or quieter running. If you only burn gas and move it often, the FlexPower at $849.00 saves money and weight.

The Westinghouse, rated as low as 52 dBA. The FlexPower is rated under 63 dB, roughly ten times the sound power at the top of its range.

Which runs longer on a tank?

The Westinghouse claims up to 18 hours at 25% load on 3.4 gal. FlexPower does not publish a runtime, and its 7 L tank is about half the size.

Can either run sensitive electronics?

Both use inverter technology. The Westinghouse states under 3% THD; FlexPower does not publish a THD figure.

Both use a 224 cc OHV engine. The Westinghouse backs it with a 3-year limited warranty; FlexPower's warranty terms are not stated in the listing.

Westinghouse iGen5000DFc Generator vs FlexPower 4500ies Quiet Inverter Generator with Electric Start

Buy the Westinghouse iGen5000DFc if you want dual-fuel flexibility, remote start, or more running watts. Buy the FlexPower 4500ies if you want a lighter, cheaper gasoline-only unit with a bigger tank. As of November 5, 2026, the Westinghouse is $999.00 at Best Buy and the FlexPower is $849.00 at FactoryPure.

Today the FlexPower 4500ies Quiet Inverter Generator with Electric Start costs $150.00 less at its best price.

Ask our shopping agent

It checks today's price at every store, compares the alternatives and answers in about a minute.