PowerSmart 21 in 170cc RWD DB8621S
The cheapest way into a rear wheel drive 3-in-1 gas mower, for sloped lawns on a tight budget. Expect less dealer support than a Toro.
Amazon $339.99$339.99
The PowerSmart 21 in 170cc RWD DB8621S rates 3.8 among self-propelled lawn mowers; the Greenworks 80V 21 in Push Mower rates 3.7 among push ones. The PowerSmart 21 in 170cc RWD DB8621S costs $110.92 less ($339.99 vs $450.91).
Greenworks 80V 21 in Push Mower
#4 in PushFull review
A sturdy steel deck push mower with a long warranty, for flat lawns up to about half an acre and owners of Greenworks 80V tools.
Amazon $450.91$450.91
Prices were last checked October 31, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Scores side by side
These two sit in different drive classes (self-propelled and push), and each is scored against the reference points for its own class, so a rating says how well each does among its own drive peers. How we rank explains each factor.
| Factor weight | PowerSmart 21 in 170cc RWD DB8621S | Greenworks 80V 21 in Push Mower |
|---|---|---|
| Overall rating | 3.8/5 | 3.7/5 |
| Value 30% | 100 $16.19 per inch of deck ($339.99, 21 in deck) | 17 $21.47 per inch of deck ($450.91 with batteries and charger, 21 in deck) |
| Deck 20% | 12 21 in deck | 100 21 in deck |
| Power 15% | 62 170 cc engine | 49 320 Wh of battery included |
| Cutting modes 15% | 100 3 ways to cut: bag, mulch, side discharge | 100 3 ways to cut: bag, mulch, side discharge |
| Warranty 20% | 50 warranty not published (neutral score used) | 75 4-year warranty |
Specifications
| PowerSmart 21 in 170cc RWD DB8621S | Greenworks 80V 21 in Push Mower | |
|---|---|---|
| Cutting | ||
| Deck width | 21 in | 21 in |
| Deck | Steel | Steel |
| Cutting height | 1.5 to 3.9 in, 6 positions | 1.4 to 4 in, 7 positions |
| Bag | Yes | Yes |
| Mulch | Yes | Yes |
| Side discharge | Yes | Yes |
| Power | ||
| Power | Gas | Battery |
| Engine or battery | 170 cc | 80 V, 4 Ah of battery |
| Battery energy | - | 320 Wh |
| Battery included | - | Yes |
| Runtime | - | 38 min |
| Brushless motor | - | Yes |
| Electric start | No | - |
| Build | ||
| Drive | Rear-wheel drive | Push |
| Folds upright | Yes | Yes |
| Weight | 59 lb | 62.8 lb |
| Warranty | - | 4 years |
| Battery warranty | - | 4 years |
| Released | - | 2024-01-16 |