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AMERISUN 21-Inch 3IN1 Gas Push Lawn Mower, 144cc vs Greenworks 40V 16" Cordless Lawn Mower

Updated July 2026 — AMERISUN 21-Inch 3IN1 Gas Push Lawn Mower, 144cc wins on engine size and weight, Greenworks 40V 16" Cordless Lawn Mower wins on noise level and runtime.

The AMERISUN mower offers robust performance and lower upfront costs, while the Greenworks mower excels in convenience and low maintenance. Choose based on your priorities.

Why AMERISUN 21-Inch 3IN1 Gas Push Lawn Mower, 144cc is better

Price

Lower initial cost at $238.49

Power

More powerful gas engine

Cutting Width

Wider 21-inch cutting deck

Why Greenworks 40V 16" Cordless Lawn Mower is better

Weight

Lighter at 35% less than traditional mowers

Maintenance

Zero maintenance with no gas or oil

Ecosystem

Compatible with 75+ Greenworks tools

Overall score

AMERISUN 21-Inch 3IN1 Gas Push Lawn Mower, 144cc
75
Greenworks 40V 16" Cordless Lawn Mower
82

Specifications

SpecAMERISUN 21-Inch 3IN1 Gas Push Lawn Mower, 144ccGreenworks 40V 16" Cordless Lawn Mower
Power SourceGasBattery
Cutting System3-in-12-in-1
Height Adjustment6 Levels5 Positions
RuntimeN/A40 mins
MaintenanceRegularZero

Dimension comparison

AMERISUN 21-Inch 3IN1 Gas Push Lawn Mower, 144ccGreenworks 40V 16" Cordless Lawn Mower

Overview of the AMERISUN 21-Inch 3IN1 Gas Push Lawn Mower

The AMERISUN 21-Inch 3IN1 Gas Push Lawn Mower is designed for small to medium-sized lawns, featuring a powerful 144cc 4-cycle engine. This gas mower is priced at $238.49 and ranked 8,653 in sales, making it a solid choice for homeowners seeking reliability and performance in their lawn care equipment. Its 21-inch cutting deck and 6-position height adjustment allow for efficient mowing and precise cutting according to various grass types and conditions.

In contrast, the Greenworks 40V 16" Cordless Lawn Mower, priced at $279.99 and ranked 813 in sales, offers a lightweight, cordless option that appeals to those prioritizing ease of use and sustainability. While the AMERISUN mower is gas-powered, the Greenworks model operates on a rechargeable battery, providing a completely different mowing experience.

Performance Comparison

The AMERISUN mower boasts a robust 144cc engine, delivering consistent cutting performance ideal for small to medium lawns. With its easy pull-start system, yard maintenance becomes straightforward and efficient. It’s built for durability with a steel deck, perfect for tackling thick grass and routine care.

On the other hand, the Greenworks mower provides gas-like performance powered by a 40V battery, offering about 40 minutes of runtime on a full charge. This model is ideal for lawns up to 1/3 acre, making it suitable for similar yard sizes but with a different operational approach. The absence of gas and oil costs also contributes to a hassle-free experience, appealing to environmentally conscious consumers.

Weight and Maneuverability

Maneuverability is a significant factor when choosing a lawn mower, and both models present their unique advantages. The AMERISUN weighs 68 lbs, allowing users to control and navigate around obstacles effectively, thanks to its durable wheels. Its foldable handle further enhances portability and storage convenience.

Conversely, the Greenworks mower is ultra-lightweight, being 35% lighter than traditional mowers, which simplifies handling and storage. Its ergonomic design and push-button start feature make it easier for users, especially in uneven terrains. Therefore, while the AMERISUN offers a sturdy build for more challenging mowing tasks, the Greenworks excels in ease of maneuverability and user comfort.

Cutting Options and Height Adjustment

The AMERISUN mower provides a versatile 3-in-1 cutting system that includes mulching, bagging, and side discharge options. With a 6-level height adjustment ranging from 1.5 inches to 3.9 inches, it allows users to customize their cut to meet different grass types and seasonal conditions effectively.

In comparison, the Greenworks mower features a 2-in-1 system with mulching and rear-bagging capabilities, along with a single-lever 5-position height control ranging from 1.25 inches to 3.375 inches. This allows for reasonable adaptability to various grass types, though it offers slightly less flexibility in height adjustment compared to the AMERISUN. The choice between these systems may hinge on user preference for either versatility or simplicity in operation.

Maintenance and Cost Efficiency

The AMERISUN is a gas-powered mower, which necessitates regular maintenance, including oil changes and fuel management. While its initial purchase price is lower than the Greenworks at $238.49, ongoing maintenance costs can add up over time. Users should factor in these potential costs when evaluating their investment.

In contrast, the Greenworks mower eliminates the hassle of gas and oil, offering zero maintenance with a quiet operation of less than 75 dB. This model promises to save users over $200 annually compared to traditional gas mowers, making it a cost-effective choice in the long run. For those looking for minimal upkeep, the Greenworks clearly stands out.

Battery and Runtime

The Greenworks mower is powered by a 4.0Ah battery that fully charges in just 2 hours, providing a runtime of approximately 40 minutes. This makes it practical for smaller lawns without the inconvenience of dealing with gas.

In contrast, the AMERISUN runs on a gas engine, which means it doesn’t require charging but does necessitate fuel management. Users will appreciate the immediate availability of power without waiting for a battery to charge. In this category, the choice depends on whether users prefer the instant readiness of gas or the convenience of a battery-powered solution with limited runtime.

Ecosystem Compatibility

The Greenworks mower offers significant ecosystem advantages, as it’s compatible with over 75 other Greenworks 40V tools, such as trimmers and blowers. This feature allows users to expand their toolkits without needing multiple battery types, making it a versatile choice for homeowners looking to simplify their outdoor maintenance.

In contrast, the AMERISUN mower is a standalone product without such ecosystem benefits. Users looking to build a cohesive set of tools may find the Greenworks mower more appealing due to its compatibility with other equipment.

Which should you buy?

Choosing between the AMERISUN 21-Inch 3IN1 Gas Push Lawn Mower and the Greenworks 40V 16" Cordless Lawn Mower largely depends on your specific needs and preferences. If you prioritize power, durability, and a lower upfront cost, the AMERISUN may be the right choice for you. However, if you seek convenience, low maintenance, and a lightweight design, the Greenworks mower stands out as an excellent option despite its higher price. Ultimately, your decision should align with your yard size, maintenance preferences, and whether you value the immediate power of gas over the flexibility of cordless operation.