Champion 3 in Semi-Trash Pump 100743
#4 in 3 in and upFull review
A low-cost 3 in semi-trash pump with hoses and wheels in the box, for ponds, pools and flood water. A good pick for homeowners who need volume on a budget.
Amazon $499.99$499.99
The Champion 3 in Semi-Trash Pump 100743 is the better gas water pump overall, rated 3.3 to 2.7. The Champion 3 in Semi-Trash Pump 100743 leads on value, flow and head. The Champion 3 in Semi-Trash Pump 100743 costs $225.55 less ($499.99 vs $725.54).
Koshin STH-80X
#11 in 3 in and upFull review
A Japanese-built 3 in semi-trash pump with a Honda engine, for dewatering and irrigation.
Amazon $725.54$725.54
Prices were last checked November 2, 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 Champion 3 in Semi-Trash Pump 100743 for value ($1.89 per gpm ($499.99, 264 gpm) vs $3.05 per gpm ($725.54, 238 gpm)), flow (264 gpm maximum vs 238 gpm maximum) and head (92 ft maximum head vs 85 ft maximum head).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every 3 in and up gas water pump; a clear win is highlighted. How we rank explains each one.
| Factor weight | Champion 3 in Semi-Trash Pump 100743 | Koshin STH-80X |
|---|---|---|
| Overall rating | 3.3/5 | 2.7/5 |
| Value 30% | 90 $1.89 per gpm ($499.99, 264 gpm) | 69 $3.05 per gpm ($725.54, 238 gpm) |
| Flow 15% | 32 264 gpm maximum | 19 238 gpm maximum |
| Head 10% | 53 92 ft maximum head | 42 85 ft maximum head |
| Solids 15% | 40 passes solids up to 0.8 in | 50 solids size not published (neutral score used) |
| Warranty 30% | 25 2-year warranty for home use | 0 warranty not published, scored as none |
Specifications
| Champion 3 in Semi-Trash Pump 100743 | Koshin STH-80X | |
|---|---|---|
| Pumping | ||
| Type | Semi-trash | Semi-trash |
| Ports | 3 in | 3 in |
| Maximum flow | 264 gpm | 238 gpm |
| Maximum head | 92 ft | 85 ft |
| Suction lift | 26 ft | 26 ft |
| Largest solids | 0.8 in | - |
| Engine and build | ||
| Engine | Champion OHV, 224 cc | Honda GX160, 163 cc |
| Fuel tank | 3 gal | 0.8 gal |
| Runtime on a tank | - | 2 hr |
| Weight | 93.9 lb | - |
| Warranty | 2 years | - |