AMERISUN 21-Inch 3IN1 Gas Push Lawn vs AMERISUN AMRISUN 21-Inch Self-Propelled Gas Lawn
Updated April 2026 — AMERISUN 21-Inch 3IN1 Gas Push Lawn wins on value, AMERISUN AMRISUN 21-Inch Self-Propelled Gas Lawn wins on drive system and maneuverability.
$238.49AMERISUN 21-Inch 3IN1 Gas Push Lawn Mower, 144cc 4-Cycle OHV Engine, Mulch/Bag/Side Discharge, 6-Position Height Adjustment, Steel Deck Walk-Behind Mower for Small to Medium Yards
AMERISUN
$314.10AMRISUN 21-Inch Self-Propelled Gas Lawn Mower for Large Yard, 170cc 4-Stroke Engine, 6-Position Adjustable Cutting Height, 3-in-1 Mulching, Side Discharge & Rear Bag for Garden Landscaping
AMERISUN
The AMERISUN AMRISUN 21-Inch Self-Propelled Gas Lawn offers superior ease of use with its self-propelled drive and larger 170cc engine, making it ideal for uneven terrain. However, the AMERISUN 21-Inch 3IN1 Gas Push Lawn provides a budget-friendly option with similar cutting width and height adjustments for smaller, flat yards.
Why AMERISUN 21-Inch 3IN1 Gas Push Lawn is better
Lower initial purchase price
Costs $238.49 compared to $314.10
Simpler mechanical design
Push mechanism requires less maintenance than self-propelled drive
Lightweight operation
Lacks self-propelled transmission components reducing overall weight
Why AMERISUN AMRISUN 21-Inch Self-Propelled Gas Lawn is better
More powerful engine displacement
170cc engine vs 144cc engine
Self-propelled drive system
Reduces user effort on slopes and large yards
Larger rear wheels for terrain
10-inch rear wheels vs unspecified smaller wheels
Overall score
Specifications
| Spec | AMERISUN 21-Inch 3IN1 Gas Push Lawn | AMERISUN AMRISUN 21-Inch Self-Propelled Gas Lawn |
|---|---|---|
| Engine Displacement | 144cc | 170cc |
| Price | $238.49 | $314.10 |
| Cutting Width | 21-inch | 21-inch |
| Cutting Height Range | 1.5"–3.9" | 1.5"–3.9" |
| Drive Type | Push | Self-Propelled |
| Rear Wheel Size | — | 10-inch |
| Grass Catcher Capacity | 1.4-bushel | 1.4-bushel |
| Deck Material | Steel | Steel |
Dimension comparison
Design and build quality
Both lawn mowers feature a durable steel cutting deck designed to resist rust and withstand routine lawn care. The AMERISUN 21-Inch 3IN1 Gas Push Lawn utilizes a straightforward walk-behind design focused on simplicity. In contrast, the AMERISUN AMRISUN 21-Inch Self-Propelled Gas Lawn incorporates a foldable handle and a more complex frame to accommodate the self-propelled transmission. Both units include a 1.4-bushel grass catcher, ensuring comparable collection capacity despite the difference in drive systems. The steel construction on both models suggests long-lasting durability suitable for thick grass and regular maintenance.
Engine performance
Power delivery differs significantly between the two models. The AMERISUN 21-Inch 3IN1 Gas Push Lawn is equipped with a 144cc 4-stroke OHV engine, which provides consistent cutting performance for small to medium-sized lawns. It features an easy pull-start system for fast ignition. The AMERISUN AMRISUN 21-Inch Self-Propelled Gas Lawn steps up with a 170cc 4-stroke OHV engine. This larger displacement delivers strong cutting performance better suited for medium to large yards. The additional power in the second model helps maintain blade speed under heavy load, particularly when the self-propelled drive is engaged.
Cutting deck and capacity
Both mowers share a 21-inch wide cutting path, which reduces mowing time while providing even coverage across the lawn. The rust-resistant steel deck on the AMERISUN 21-Inch 3IN1 Gas Push Lawn is built for durability. Similarly, the AMERISUN AMRISUN 21-Inch Self-Propelled Gas Lawn features a heavy-duty steel deck. Both support a 3-in-1 function, allowing users to mulch for natural fertilization, use rear bagging for a clean finish, or employ side discharge for fast trimming. The included 1.4-bushel grass catcher on both units minimizes emptying frequency during typical mowing sessions.
Maneuverability and drive
This category highlights the primary distinction between the two products. The AMERISUN 21-Inch 3IN1 Gas Push Lawn requires the user to push the unit manually, which is manageable on flat terrain but can be strenuous on slopes. The AMERISUN AMRISUN 21-Inch Self-Propelled Gas Lawn features a high-wheel self-propelled design equipped with 10-inch rear and 7-inch front wheels. This configuration allows the mower to glide smoothly over hills, slopes, and uneven terrain, making yard work effortless. The self-propelled mechanism significantly reduces physical exertion during operation.
Height adjustment versatility
Customization options are identical across both models, offering flexibility for various grass types. The AMERISUN 21-Inch 3IN1 Gas Push Lawn provides 6-level height adjustment ranging from 1.5 inches to 3.9 inches. This allows users to achieve a precise, even cut tailored to seasonal conditions. The AMERISUN AMRISUN 21-Inch Self-Propelled Gas Lawn also offers 6-position adjustable cutting height within the same 1.5-inch to 3.9-inch range. This consistency ensures that regardless of the drive system chosen, users can protect their grass and soil while achieving a professional look for every season.
Maintenance and durability
Long-term upkeep varies slightly due to the mechanical differences. The AMERISUN 21-Inch 3IN1 Gas Push Lawn has fewer moving parts since it lacks a drive transmission, potentially simplifying long-term maintenance. The engine requires standard 4-cycle care such as oil changes and air filter cleaning. The AMERISUN AMRISUN 21-Inch Self-Propelled Gas Lawn includes the self-propelled drive system which may require occasional adjustment or belt maintenance. However, both units are built with durable steel decks and reliable OHV engines designed to handle routine lawn care tasks without frequent repairs.
Price and value
Cost is a major deciding factor for many buyers. The AMERISUN 21-Inch 3IN1 Gas Push Lawn is priced at $238.49, making it an accessible option for budget-conscious homeowners. It delivers essential features without the premium associated with self-propelled mechanisms. The AMERISUN AMRISUN 21-Inch Self-Propelled Gas Lawn is priced at $314.10. While higher, the additional cost covers the larger 170cc engine and the self-propelled drive system. For users with larger or uneven yards, the value proposition of the second model lies in the reduced physical effort and increased power.
Which one should you buy?
Your choice depends on yard size and terrain. If you have a small to medium-sized flat lawn and prioritize budget, the AMERISUN 21-Inch 3IN1 Gas Push Lawn is the suitable choice. It offers reliable performance with a 144cc engine and versatile cutting options at a lower price point. If you manage medium to large yards with slopes or uneven ground, the AMERISUN AMRISUN 21-Inch Self-Propelled Gas Lawn is the better investment. The 170cc engine and self-propelled drive with 10-inch rear wheels provide the power and ease of movement needed for more demanding landscaping tasks.