Generac T20-S
#5 in Up to 2 inFull review
A 2 in trash pump for muddy water with stones and sticks, with a long run time and a three-year warranty. For owners who deal with dirty flood water.
A.P. Electric $1,199$1,199
The Generac T20-S is the better gas water pump overall, rated 3.3 to 3.1. The Generac T20-S leads on solids and flow. The Generac PRO ST20-S wins on value and head. The Generac PRO ST20-S costs $500 less ($699 vs $1,199).
Generac PRO ST20-S
#9 in Up to 2 inFull review
A well-made 2 in semi-trash pump with a long run time and a three-year warranty, for homeowners who drain pools and yards every year.
A.P. Electric $699$699
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 Generac T20-S for solids (passes solids up to 1 in vs passes solids up to 0.3 in) and flow (185 gpm maximum vs 158 gpm maximum).
- Choose the Generac PRO ST20-S for value ($4.42 per gpm ($699, 158 gpm) vs $6.48 per gpm ($1,199, 185 gpm)) and head (108 ft maximum head vs 98 ft maximum head).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every up to 2 in gas water pump; a clear win is highlighted. How we rank explains each one.
| Factor weight | Generac T20-S | Generac PRO ST20-S |
|---|---|---|
| Overall rating | 3.3/5 | 3.1/5 |
| Value 30% | 36 $6.48 per gpm ($1,199, 185 gpm) | 53 $4.42 per gpm ($699, 158 gpm) |
| Flow 15% | 71 185 gpm maximum | 48 158 gpm maximum |
| Head 10% | 63 98 ft maximum head | 80 108 ft maximum head |
| Solids 15% | 60 passes solids up to 1 in | 6 passes solids up to 0.3 in |
| Warranty 30% | 50 3-year warranty for home use | 50 3-year warranty for home use |
Specifications
| Generac T20-S | Generac PRO ST20-S | |
|---|---|---|
| Pumping | ||
| Type | Trash | Semi-trash |
| Ports | 2 in | 2 in |
| Maximum flow | 185 gpm | 158 gpm |
| Maximum head | 98 ft | 108 ft |
| Suction lift | 26 ft | 26 ft |
| Largest solids | 1 in | 0.3 in |
| Engine and build | ||
| Engine | Generac G-Force, 211 cc | Generac G-Force OHC, 169 cc |
| Fuel tank | 3 gal | 3 gal |
| Runtime on a tank | 5 hr | 5 hr |
| Weight | 109.1 lb | 65.3 lb |
| Warranty | 3 years | 3 years |