Compare Mowers
List prices are the manufacturer’s published figures, re-checked daily; they exclude tax, freight and dealer setup.
A side-by-side reference of each model's stated specifications. MowerFacts doesn’t give opinions: where a published, spec-derived rule can separate machines we mark a Data Pick and show the rule; here, read the values and decide what fits your needs.
Best suited for
What each model is built for, from its duty class and key specs. This is a neutral reference — MowerFacts does not rank one model above another.
- Exmark Exmark Navigator Mower — commercial: daily paid use and high acreage; 48-inch deck
- Exmark Commercial 21 X-Series (ECX180) — commercial: daily paid use and high acreage; 21-inch deck; gas powered
What’s different? The 5 differences that matter most, from the published figures.
- Exmark Navigator Mower lists at $20,899; Commercial 21 X-Series (ECX180) lists at $1,899, a $19,000 difference. List price is the maker's own figure before tax, freight and dealer setup. Dealers set the final price.
- Exmark Navigator Mower weighs 1,191 lbs (540.2 kg); Commercial 21 X-Series (ECX180) weighs 117 lbs (53.1 kg), a 1,074 lbs difference. Operating weight bears on trailer payload, ramps and soft turf. On its own it says nothing about build quality. What Exmark Navigator Mower's weight means for a trailer ›
- Exmark Navigator Mower has a 48 in (1,219 mm) deck; Commercial 21 X-Series (ECX180) has a 21 in (533 mm) deck, a 27 in difference. Deck width sets how much grass each pass covers. Mowing time also depends on ground speed, turns and obstacles, so a wider deck alone does not fix the job's length. Time both decks on your own lawn ›
- Exmark Navigator Mower holds 7.5 gal (28.4 L) of fuel; Commercial 21 X-Series (ECX180) holds 1 gal (3.8 L) of fuel, a 6.5 gal difference. Tank size bounds how long a machine runs between stops. Consumption varies with engine, load and speed, so hours per tank are not fixed.
- Exmark Navigator Mower has a 45.6 ci (747 cc) engine; Commercial 21 X-Series (ECX180) has a 10.9 ci (179 cc) engine, a 34.7 ci difference. Displacement is the engine's size, not its output. A larger engine is not necessarily a more powerful one.
3 more differences, calculated figures and what isn’t comparable
Other verified differences
- Exmark Navigator Mower uses a Kohler CH749 engine; Commercial 21 X-Series (ECX180) uses a Kawasaki FJ180V engine.
- Exmark Navigator Mower has a published top speed of 7 mph; Commercial 21 X-Series (ECX180) has a published top speed of 4.2 mph, a 2.8 mph difference.
- Exmark Navigator Mower cuts from 1 in (25 mm) to 4 in (102 mm); Commercial 21 X-Series (ECX180) cuts from 1 in (25 mm) to 4.5 in (114 mm).
Calculated by MowerFacts
- Exmark Navigator Mower works out to 2.7 acres/hour; Commercial 21 X-Series (ECX180) works out to 0.7 acres/hour, a 2.0 acres/hour difference. Calculated by MowerFacts from deck width and the published top speed at 80% efficiency; it is not a manufacturer figure, and real mowing is slower.
Not comparable
- Engine Power: not published for Commercial 21 X-Series (ECX180).
- Bagger Capacity: not published for Commercial 21 X-Series (ECX180).
- Deck Construction: not published for Commercial 21 X-Series (ECX180).
Verified means each manufacturer publishes the figure. A bigger number is only a bigger number; nothing here says which machine is better. The full specification table is below.
Which is faster on your property? › Measure your lawn once and MowerFacts times all 2 against it.
| Spec | Exmark Navigator Mower Exmark · Commercial |
Commercial 21 X-Series (ECX180) Exmark · Commercial |
|---|---|---|
| List price | $20,899 | $1,899 |
| Engine | ||
| Power Source | — | gas |
| Engine Make | Kohler CH749 | Kawasaki FJ180V |
| Displacement | 45.6 ci (747 cc) | 10.9 ci (179 cc) |
| Engine Power | 26.5 hp | — |
| Engine Model | ECH749 | — |
| Deck | ||
| Cutting Width | 48 in (1219 mm) | 21 in (533 mm) |
| Deck Construction | 7-gauge sides joined by a continuous bead weld to a 10-gauge top, 3/16" wear guard | — |
| Deck Gauge | 7 | — |
| Min Cut Height | 1 in (25 mm) | 1 in (25 mm) |
| Max Cut Height | 4 in (102 mm) | 4.5 in (114 mm) |
| Blade Tip Speed | 18500 ft/min (5638.8 m/min) | — |
| Drive | ||
| Ground Speed | 7 mph | 4.2 mph |
| Dimensions | ||
| Weight | 1191 lbs (540.2 kg) | 117 lbs (53.1 kg) |
| Fuel Capacity | 7.5 gal (28.4 L) | 1 gal (3.8 L) |
| Length | 94.5 in (2400 mm) | — |
| Width | 49.2 in (1250 mm) | — |
| Height | 51.2 in (1300 mm) | — |
| General | ||
| Bagger Capacity | 8.2 bu (287.7 L) | — |
Where these models differ, explained
Exmark Navigator Mower: Specs verified against the retailer listing on Jun 6, 2026 — allmachines.com.
Commercial 21 X-Series (ECX180): Specs verified against the retailer listing on Jun 6, 2026 — altmantractor.com.
Independent reference database. Specs compiled from manufacturer sources and normalized for comparison; verify with the manufacturer or dealer before purchase.