Quick Answer: Greenworks 40V Self-Propelled vs SENIX 22″ Gas — Which Should You Buy in 2026?
Choose the Greenworks 40V if quiet operation, simpler maintenance, and cordless convenience matter more than upfront price. It includes a 5.0Ah battery and charger, has a brushless motor, and claims up to 45 minutes of runtime, but costs $169.90 more than the SENIX. Choose the SENIX if you want the lower purchase price, a wider 22-inch deck, and the consistent power of a 170cc four-cycle engine. Both are self-propelled steel-deck mowers.
Winner by Category
| Category | Winner | Evidence |
|---|---|---|
| Power/Suction | SENIX 22″ Gas | The SENIX uses a 170cc 4-cycle OHV engine and rear-wheel drive. The Greenworks uses a 40V brushless motor, which is designed for efficient operation and more torque. |
| Cutting performance | SENIX 22″ Gas | The SENIX has a 22-inch steel deck and a 3-in-1 cutting system. The Greenworks has a 21-inch steel deck and supports mulching, side discharge, and bagging according to its product listing. |
| Navigation/Ease of use | Greenworks | The Greenworks starts without gasoline or a four-cycle engine and includes a single-lever height adjustment. Its self-propelled design and 8-inch front wheels aid yard travel. |
| Handling | Greenworks | The electric mower has a brushless motor and self-propelled drive without the engine-related starting and fuel tasks. The SENIX does provide rear-wheel drive and an ergonomic handle. |
| Runtime/Fuel efficiency | Greenworks | Greenworks states up to 45 minutes with a fully charged 5.0Ah battery, depending on grass conditions and operator technique. SENIX fuel-runtime information was not provided. |
| Noise | Greenworks | Greenworks specifically describes its brushless motor as offering quiet operation. The SENIX is powered by a gas engine, but a measured noise figure was not provided. |
| Price & value | SENIX | The SENIX costs $329.99, while the Greenworks costs $499.89 and includes a battery and charger. The lower-priced SENIX is the better fit for buyers prioritizing initial cost. |
Pros
- Highly efficient brushless motor provides strong torque and longer overall lifespan
- Self-propelled drive reduces pushing effort on uneven or thick turf
- Durable 21-inch steel deck combined with versatile 3-in-1 cutting modes
- Quiet, emission-free operation with no fuel or oil maintenance required
- Vertical storage capability maximizes limited storage space
Cons
- Runtime of up to 45 minutes can vary significantly depending on grass thickness and operator technique
- Only a single 5.0Ah battery is included, which may limit continuous use on larger properties
- Vertical storage requires sufficient ceiling clearance and careful handling of the unit
The Greenworks 40V 21" Brushless Cordless Self-Propelled Lawn Mower is a walk-behind electric mower built for homeowners seeking gas-free convenience. It features a robust steel deck and a compact design that supports vertical storage, creating a clean and space-efficient first impression for garage or shed use.
Performance centers on the efficient brushless motor that supplies strong torque while remaining quiet. The self-propelled rear-wheel drive helps maintain consistent speed across varied terrain, and the single-lever 7-position height adjustment pairs with 3-in-1 rear bag, side discharge, and mulching options. With the included 5.0Ah battery users can expect up to 45 minutes of runtime under typical conditions, and the system is compatible with over 75 other Greenworks 40V tools.
Considerations include the fact that actual runtime depends on grass density and mowing technique, so larger lawns may require an extra battery. The single included battery and the need for adequate vertical clearance for storage are the main practical limitations based on the specifications.
Overall this mower suits homeowners with medium to large yards who value low-maintenance electric power, quiet operation, and flexible cutting options. Those already invested in the Greenworks 40V ecosystem will gain the most value from the battery interchangeability and reduced upkeep.
Pros
- Powerful 170cc OHV engine delivers reliable cutting performance
- True 3-in-1 functionality with large 19-gallon bagger included
- Self-propelled drive and ergonomic handle reduce user fatigue
- Easy single-lever height control and foldable compact storage
- Comes ready with oil, plugs, chute, bagger, and 2-year limited warranty
Cons
- Single-speed transmission offers less speed flexibility than multi-speed models
- Gas engine requires ongoing fuel, oil, and routine maintenance unlike electric alternatives
- Rear-wheel-drive layout may feel less stable on very steep or loose surfaces
The SENIX 22-inch self-propelled gas lawn mower is a walk-behind unit built around a durable steel deck and ergonomic handle. Its foldable handle and vertical storage design make it easy to tuck away in a garage or shed, giving a practical first impression for owners of small to medium yards.
Performance centers on the 170cc OHV 4-cycle engine that supplies steady power through rear-wheel-drive propulsion. The 3-in-1 system handles mulching, side discharge, or rear bagging with the supplied 19-gallon bagger. Rugged 8-inch front and 11-inch rear wheels roll smoothly over uneven ground while the single-lever 6-position height adjustment ranges from 1.25 to 4 inches. An integrated washout port keeps the deck clean after each session.
Considerations include the single-speed drive that limits speed choices and the gas engine that needs regular fuel and oil care. Limited user feedback currently available means long-term durability details remain sparse.
This mower delivers strong value for homeowners who want a ready-to-use gas-powered machine with versatile cutting modes, included accessories, and compact storage for routine lawn maintenance.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply. As an Amazon Associate we earn from qualifying purchases. Images, product titles, and product highlights from Amazon.
Specifications Side-by-Side
| Specification | Greenworks 40V 21″ Brushless Self-Propelled | SENIX 22″ Self-Propelled Gas |
|---|---|---|
| Model ASIN | B07MG7M2BM | B0FFMYSSJN |
| Brand | Greenworks | SENIX |
| Power source | 40V battery | 170cc OHV 4-cycle gas engine |
| Drive system | Self-propelled | Rear-wheel drive, single-speed |
| Deck width | 21 inches | 22 inches |
| Deck material | Steel | Steel |
| Motor or engine | Brushless motor | 170cc 4-cycle OHV engine |
| Stated runtime | Up to 45 minutes with fully charged 5.0Ah battery | Not provided |
| Battery included | 5.0Ah battery included | Not applicable |
| Charger included | Yes | Not applicable |
| Cutting options | Product listing identifies a lawn mower with bagging, mulching, and side-discharge functions | Mulching, side discharge, and rear bagging |
| Bagging equipment | Not specified in the supplied data | Included 19-gallon bagger |
| Height adjustment | Single-lever height adjustment | 6-position height adjustment |
| Front wheels | 8 inches | Not provided |
| Washout port | Not provided | Yes |
| Amazon rating | 4.2/5 | 4.6/5 |
| Price | $499.89 | $329.99 |
Performance
Core Performance
The main performance difference is the type of power each mower uses. Greenworks pairs a 40V system with a brushless motor and a durable 21-inch steel deck. Its listing says the brushless design provides more torque, quiet operation, and longer life. The supplied runtime claim is up to 45 minutes from the included fully charged 5.0Ah battery, although Greenworks qualifies that figure by noting that grass condition and operator technique affect results.
The SENIX takes the conventional gas approach: a 170cc OHV four-cycle engine, a steel 22-inch deck, and rear-wheel drive. That engine specification gives the SENIX the clearer case for demanding cutting work when the priority is sustained gas-engine power rather than cordless convenience. However, the supplied research does not provide a measured cutting test, blade-speed figure, torque figure, or direct side-by-side test result, so it would be inaccurate to assign a precise performance advantage beyond the stated engine and motor specifications.
The SENIX has a one-inch wider cutting path than the Greenworks. That difference is modest, but it can reduce the number of passes across an open lawn. The Greenworks counters with a brushless motor that is specifically described as efficient and quiet. For ordinary residential mowing, the better choice depends less on deck width alone and more on whether your priority is gas-style power or low-noise battery operation.
Handling & Ergonomics
Both models are self-propelled, so neither requires you to provide all of the forward force on every pass. The Greenworks listing identifies 8-inch front wheels and a single-lever height adjustment. Those details favor quick setup and straightforward operation: one control can change the cutting height, and the electric motor avoids the pull-start and fuel-handling steps associated with gas equipment.
The SENIX uses rear-wheel drive and a single-speed transmission. Rear-wheel drive can be useful when the mower needs traction around a yard, while the single-speed system keeps the controls uncomplicated. Its product data also calls out an ergonomic handle. The SENIX has six height positions, compared with the Greenworks listing’s single-lever adjustment, although the actual cutting-height ranges for either mower were not supplied.
There is no supplied weight measurement for either mower, so the comparison cannot responsibly declare one model lighter or easier to lift. Likewise, there is no published turning-radius or propulsion-speed figure. The practical handling verdict is therefore based on the drive layouts and controls that are documented: Greenworks for simpler electric operation, and SENIX for rear-wheel-drive gas mowing with a single-speed layout.
Runtime / Fuel & Maintenance
Greenworks provides a concrete runtime estimate: up to 45 minutes with the included 5.0Ah battery fully charged. That is not a guaranteed mowing time for every yard. Dense grass, cutting conditions, and how the operator uses the mower can change the result, as the product listing explains. Buyers with a yard that takes longer than the available charge should consider whether a second compatible battery would be necessary; the supplied data does not provide a price or runtime for an additional pack.
The SENIX does not have a stated runtime in the supplied product information. Its 170cc four-cycle engine uses gasoline, and the data does not specify fuel-tank capacity, operating time per tank, fuel consumption, oil capacity, or refueling interval. It therefore has an advantage in the general convenience of refueling rather than waiting for a battery, but the available research cannot quantify that advantage.
Maintenance is more straightforward on the Greenworks because the provided feature set centers on a brushless electric motor and rechargeable battery. The SENIX’s four-cycle engine represents a more traditional maintenance routine, but the supplied data does not list specific service intervals. Do not treat this comparison as a substitute for either manufacturer’s maintenance instructions.
Best Use Cases
The Greenworks is the stronger match for homeowners who want a cordless mower that starts without gasoline, delivers quiet brushless operation, and can share its 40V battery platform with other compatible Greenworks tools. Its included 5.0Ah battery and charger make it a complete starting kit rather than a tool-only purchase. The up-to-45-minute claim makes it most compelling when the available runtime suits the mowing job.
The SENIX is better suited to buyers who want a lower entry price, a 22-inch cutting deck, and a 170cc gas engine. Its 3-in-1 system covers mulching, side discharge, and rear bagging, and the included 19-gallon bagger is useful when collecting clippings is part of the mowing routine. The washout port also gives the SENIX a documented cleaning feature that the Greenworks listing does not identify.
Maintenance & Running Costs
The Greenworks requires the included 5.0Ah battery to be charged before mowing. Its main ownership advantage is that there is no gasoline or engine oil listed as part of its operation, and the brushless motor is promoted as having longer life. The 40V battery is also compatible with more than 75 Greenworks tools according to the product title, which can improve value if you already own tools in that system. Battery replacement pricing and battery warranty information were not supplied.
The SENIX requires gasoline for its 170cc four-cycle engine. The available data does not specify whether oil is included, how much fuel it uses, or what replacement consumables cost. Its engine-based design consequently brings fuel and routine engine-care considerations that do not apply in the same way to the Greenworks. The SENIX does include a washout port, which simplifies cleaning beneath the deck, and its 19-gallon bagger is included rather than an optional accessory in the supplied listing.
For both mowers, keep the deck and cutting system clear of accumulated grass, follow the manual’s blade and safety guidance, and store the machine as directed. Because the supplied research does not include service schedules, blade prices, oil requirements, fuel costs, or battery replacement costs, the long-term dollar difference cannot be calculated reliably.
Features & Usability
Greenworks focuses on low-friction cordless use. The package includes the mower’s 5.0Ah battery and charger, so there is no need to buy those two core items separately for initial operation. Its single-lever height adjustment is quicker in concept than changing each wheel independently, and its 8-inch front wheels are specifically listed. The self-propelled system is paired with a steel deck and brushless motor rather than a gas engine.
The SENIX emphasizes cutting flexibility. Its 3-in-1 system supports mulching, side discharge, and rear bagging, while the included 19-gallon bagger makes collection part of the supplied package. Six-position height adjustment gives the user multiple settings, although the actual heights are not stated in the product data. Rear-wheel drive and single-speed propulsion keep the drivetrain description simple, and an ergonomic handle is included among the listed features.
These feature sets are aimed at different definitions of convenience. Greenworks removes fuel preparation and offers a quieter brushless format. SENIX offers a wider deck and more explicitly documented collection and deck-cleaning equipment. Neither product should be credited with features that are not listed here, such as folding dimensions, LED headlights, variable-speed controls, or a specific discharge-control design.
Price & Value Analysis
At the supplied Amazon prices, the Greenworks costs $499.89 and the SENIX costs $329.99. The difference is $169.90, with Greenworks carrying the higher upfront price. That price gap partly reflects the Greenworks package including a 5.0Ah battery and charger. The SENIX does not use a battery, and its listing includes a 19-gallon bagger.
The Greenworks is worth the premium when you place a high value on quiet operation, battery-powered starting, and access to a 40V ecosystem advertised as supporting more than 75 compatible tools. It is also the more convenient choice for a homeowner who would rather charge a battery than store and refuel a gas mower. The included battery and charger make the comparison more favorable than a bare-tool price would.
The SENIX is worth choosing when the initial purchase price is the decisive factor or when the 22-inch deck and 170cc engine better match your mowing priorities. Its 4.6/5 Amazon rating is higher than the Greenworks rating of 4.2/5, although ratings are not a substitute for controlled testing. The lower price, rear-wheel drive, 3-in-1 cutting system, and included bagger create a strong value case for conventional lawn care.
Which Should You Buy?
Choose Greenworks 40V Self-Propelled if…
- You want a cordless mower with no gasoline listed as part of its operation.
- Quiet operation is important; Greenworks specifically describes the brushless motor as quiet.
- You want up to 45 minutes of stated runtime from the included fully charged 5.0Ah battery.
- You already own, or plan to buy, other compatible Greenworks 40V tools.
- You prefer single-lever cutting-height adjustment and an included battery and charger.
- You accept paying $169.90 more for the electric platform and its included charging equipment.
Choose SENIX 22″ Gas if…
- You want the lower purchase price of $329.99.
- You prefer a 170cc OHV four-cycle gas engine and rear-wheel drive.
- You want the wider 22-inch deck rather than Greenworks’ 21-inch deck.
- You need mulching, side discharge, and rear bagging in one mower.
- You want the included 19-gallon bagger and a washout port for deck cleaning.
- You prefer six-position height adjustment and a single-speed drive system.
Consider a different model if…
- You need a documented runtime longer than 45 minutes and do not want to purchase or manage another battery.
- You need exact cutting-height ranges, mower weight, fuel consumption, or noise measurements before buying; those figures were not supplied for this comparison.
- You want a mower with a different deck size, drive configuration, or power platform than these two options provide.
- You are comparing professional or heavy-duty mowing requirements and need independently measured cutting and durability results rather than listing specifications.
- For more options at every price point, see our full guide to Best Walk-Behind Lawn Mowers.
Frequently Asked Questions
Is the Greenworks 40V mower better than the SENIX gas mower?
It is better for buyers who prioritize quiet cordless operation, simpler electric starting, and Greenworks battery compatibility. The SENIX is better for buyers who prioritize a lower price, a 22-inch deck, and a 170cc gas engine. The Greenworks costs $499.89 versus $329.99 for the SENIX, so the right choice depends on whether the electric convenience justifies the $169.90 premium.
How long does the Greenworks 40V mower run?
Greenworks states up to 45 minutes with a fully charged included 5.0Ah battery. The company qualifies that estimate by saying runtime varies with grass condition and operator technique. The supplied data does not provide a runtime figure for the SENIX or a guaranteed area that either mower can cut.
Does the SENIX mower bag, mulch, and discharge grass?
Yes. The SENIX has a 3-in-1 cutting system with mulching, side discharge, and rear bagging. Its product listing also includes a 19-gallon bagger. The supplied Greenworks data identifies the mower as a cordless self-propelled model, but it does not specify the bagger capacity.
Which mower is quieter?
The Greenworks has the stronger documented noise advantage because its brushless motor is described as offering quiet operation. The SENIX uses a 170cc gas engine, but the supplied research does not include a decibel measurement for either mower. Therefore, this comparison can identify Greenworks as the quieter-oriented design without assigning an unsupported noise number.
