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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.

AMERISUN 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$238.49

AMERISUN 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

Winner
AMRISUN 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$314.10

AMRISUN 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

AMERISUN 21-Inch 3IN1 Gas Push Lawn
77
AMERISUN AMRISUN 21-Inch Self-Propelled Gas Lawn
85

Specifications

SpecAMERISUN 21-Inch 3IN1 Gas Push LawnAMERISUN AMRISUN 21-Inch Self-Propelled Gas Lawn
Engine Displacement144cc170cc
Price$238.49$314.10
Cutting Width21-inch21-inch
Cutting Height Range1.5"–3.9"1.5"–3.9"
Drive TypePushSelf-Propelled
Rear Wheel Size10-inch
Grass Catcher Capacity1.4-bushel1.4-bushel
Deck MaterialSteelSteel

Dimension comparison

AMERISUN 21-Inch 3IN1 Gas Push LawnAMERISUN AMRISUN 21-Inch Self-Propelled Gas Lawn

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.