Generac PRO ST20-S vs Westinghouse WP160

Last updated: November 2, 2026

The Westinghouse WP160 is the better gas water pump overall, rated 3.6 to 3.1. The Westinghouse WP160 leads on value and solids. The Generac PRO ST20-S wins on head. The Westinghouse WP160 costs $430 less ($269 vs $699).

Generac PRO ST20-S vs Westinghouse WP160

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?

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 weightWestinghouse WP160Generac PRO ST20-S
Overall rating3.6/53.1/5
Value 30%94 $1.70 per gpm ($269, 158 gpm)53 $4.42 per gpm ($699, 158 gpm)
Flow 15%48 158 gpm maximum48 158 gpm maximum
Head 10%52 91 ft maximum head80 108 ft maximum head
Solids 15%30 passes solids up to 0.6 in6 passes solids up to 0.3 in
Warranty 30%50 warranty not published (neutral score used)50 3-year warranty for home use

Specifications

Westinghouse WP160Generac PRO ST20-S
Pumping
TypeSemi-trashSemi-trash
Ports2 in2 in
Maximum flow158 gpm158 gpm
Maximum head91 ft108 ft
Suction lift25 ft26 ft
Largest solids0.6 in0.3 in
Engine and build
Engine212 ccGenerac G-Force OHC, 169 cc
Fuel tank-3 gal
Runtime on a tank-5 hr
Weight53 lb65.3 lb
Warranty-3 years

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