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AMERISUN 21-Inch 3IN1 Gas Push Lawn Mower, 144cc vs WORX Nitro 21" Cordless Lawn Mower, Brushless

Updated July 2026 — full head-to-head comparison.

Overview of the AMERISUN 21-Inch Gas Push Lawn Mower

The AMERISUN 21-Inch 3IN1 Gas Push Lawn Mower is designed for small to medium-sized yards with its reliable 144cc 4-cycle OHV engine. Priced at $238.49, it offers a blend of efficiency and durability, making it a solid choice for homeowners seeking a dependable gas mower. It features a 21-inch steel cutting deck, which helps reduce mowing time while providing even coverage. The mower also supports 3-in-1 functionality, allowing for mulching, bagging, and side discharge, catering to various lawn care needs. With a 6-position height adjustment ranging from 1.5 to 3.9 inches, it accommodates different grass types and seasonal conditions effectively.

Overview of the WORX Nitro 21" Cordless Lawn Mower

In contrast, the WORX Nitro 21" Cordless Lawn Mower is priced higher at $379.99 but comes equipped with advanced features such as brushless motor technology and aerodeck technology, which enhances cut quality and efficiency. This mower is suitable for lawns up to ½ acre, powered by two 5.0 Ah batteries that provide convenience and eliminate emissions, making it an environmentally friendly option. The mower also has a 3-in-1 functionality, similar to the AMERISUN, but boasts a wider height adjustment range of 1.5 to 4 inches with a single lever. This versatility might appeal to those with varied lawn conditions, offering a more customized mowing experience.

Power and Performance

The AMERISUN’s 144cc engine ensures consistent performance for routine lawn maintenance, especially for smaller yards, while weighing 68 lbs, making it easy to maneuver. The gas engine's power is reliable and offers a quick ignition through an easy pull-start system. However, the WORX Nitro, with its brushless motor, delivers 40% more power and 10% longer runtime compared to earlier models. This enhanced performance is particularly beneficial for tackling thicker grass, thanks to its Intellicut technology that adjusts cutting speed based on grass density. The performance aspect places the WORX Nitro ahead in terms of versatility and efficiency, especially for larger or more challenging lawns.

Design and Durability

While both mowers feature durable designs, the AMERISUN’s steel deck is rust-resistant and built for long-lasting durability, ideal for regular lawn care. The lightweight build enhances its maneuverability, allowing easy navigation around obstacles. On the other hand, the WORX Nitro is crafted with a high-strength polymer deck that is lightweight yet resistant to impact and corrosion, promising a longer lifespan. The ergonomic design of the WORX, including a fully collapsible handle for space-saving storage, can enhance user convenience. Thus, while both mowers offer solid construction, the WORX Nitro’s innovative design may appeal more to those prioritizing long-term durability and user-friendly features.

Height Adjustment and Cutting Versatility

The AMERISUN provides a 6-position height adjustment ranging from 1.5 to 3.9 inches, allowing users to customize their cutting height based on grass type and seasonal changes. This feature is straightforward but effective for maintaining lawn aesthetics. In comparison, the WORX Nitro offers a superior 7-position height adjustment up to 4 inches, allowing for greater flexibility in managing various lawn conditions. This added versatility can be particularly beneficial for those who face diverse mowing needs throughout the year. The ease of switching between mulching, bagging, and side discharge modes in both mowers adds to their overall functionality.

Environmental Impact and Noise Level

The AMERISUN, being a gas-powered mower, does produce emissions and is typically noisier than electric models. This can be a drawback for environmentally conscious consumers or those living in noise-sensitive neighborhoods. On the contrary, the WORX Nitro operates on batteries, producing zero emissions and significantly less noise, making it a more eco-friendly choice. The lack of gas also translates to lower maintenance costs over time given that it does not require fuel, oil changes, or spark plug replacements. This factor may strongly influence buyers who prioritize sustainability and a quieter mowing experience.

Maintenance and User Experience

The AMERISUN requires standard gas mower maintenance, including fuel and oil checks, which can be cumbersome for some users. Despite its reliability, the upkeep might be seen as a drawback compared to the WORX Nitro. The WORX’s battery-powered design means less frequent maintenance and the convenience of simply charging the batteries when not in use. Additionally, the onboard charge-level indicator provides real-time updates on battery life, enhancing the user experience. As a result, the WORX Nitro stands out for its low-maintenance needs and user-friendly features.

Which should you buy?

Choosing between the AMERISUN 21-Inch Gas Push Lawn Mower and the WORX Nitro 21" Cordless Lawn Mower ultimately depends on your specific yard care needs and preferences. The AMERISUN is a more budget-friendly option at $238.49, providing reliable gas-powered performance for small to medium lawns. However, the WORX Nitro, priced at $379.99, offers advanced features, greater power, and a more environmentally friendly design, making it suitable for larger or more diverse lawns. If you prioritize user experience and sustainability, the WORX Nitro may be the better investment, while those looking for a straightforward, effective mower for smaller spaces might find the AMERISUN to be the perfect fit.