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 is the better lawn mower overall, rated 3.8 to 2.2. The PowerSmart 21 in 170cc RWD DB8621S leads on value, cutting modes and deck. The Husqvarna W520 wins on power. The PowerSmart 21 in 170cc RWD DB8621S costs $1,159.01 less ($339.99 vs $1,499).
Husqvarna W520
#22 in Self-propelledFull review
A commercial grade walk mower for owners who want something that outlasts consumer models. Most home lawns are served as well by a Toro for much less.
Husqvarna $1,499$1,499
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.
Which should you buy?
- Choose the PowerSmart 21 in 170cc RWD DB8621S for value ($16.19 per inch of deck ($339.99, 21 in deck) vs $74.95 per inch of deck ($1,499, 20 in deck)), cutting modes (3 ways to cut: bag, mulch, side discharge vs 1 way to cut: bag) and deck (21 in deck vs 20 in deck).
- Choose the Husqvarna W520 for power (179 cc engine vs 170 cc engine).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every self-propelled lawn mower; a clear win is highlighted. How we rank explains each one.
| Factor weight | PowerSmart 21 in 170cc RWD DB8621S | Husqvarna W520 |
|---|---|---|
| Overall rating | 3.8/5 | 2.2/5 |
| Value 30% | 100 $16.19 per inch of deck ($339.99, 21 in deck) | 0 $74.95 per inch of deck ($1,499, 20 in deck) |
| Deck 20% | 12 21 in deck | 0 20 in deck |
| Power 15% | 62 170 cc engine | 74 179 cc engine |
| Cutting modes 15% | 100 3 ways to cut: bag, mulch, side discharge | 0 1 way to cut: bag |
| Warranty 20% | 50 warranty not published (neutral score used) | 50 warranty not published (neutral score used) |
Specifications
| PowerSmart 21 in 170cc RWD DB8621S | Husqvarna W520 | |
|---|---|---|
| Cutting | ||
| Deck width | 21 in | 20 in |
| Deck | Steel | Aluminum |
| Cutting height | 1.5 to 3.9 in, 6 positions | 1.5 to 4.5 in, 9 positions |
| Bag | Yes | Yes |
| Bag capacity | - | 1.9 bushels |
| Mulch | Yes | No |
| Side discharge | Yes | No |
| Power | ||
| Power | Gas | Gas |
| Engine or battery | 170 cc | 179 cc (Kawasaki FJ180 KAI) |
| Electric start | No | - |
| Build | ||
| Drive | Rear-wheel drive | Rear-wheel drive |
| Folds upright | Yes | Yes |
| Weight | 59 lb | 112 lb |