The cheapest high-flow pump here by a wide margin. Buy it as a budget upgrade if you can live without a published warranty.
Price checked November 9, 2026. As an Amazon Associate we earn from qualifying purchases.
Every Wassermann WDP model we rank, smallest first. Ratings compare each against its own flow.
| Model | Flow | Rating | Price |
|---|---|---|---|
| Wassermann 3WDP4 4.0 GPM 45 psi | 4 GPM | 3.3/5 | $59.99 |
| Wassermann 4WDP5 5.0 GPM 55 psi (this one) | 5 GPM | 3.6/5 | $63.16 |
The rating comes from 6 measured or published factors, each scored 0-100 against fixed reference points for its flow. How we rank explains each one.
| Model number | 4WDP5-55-12V |
|---|---|
| Performance | |
| Rated open flow | 5 GPM |
| Shut-off pressure | 55 psi |
| Price per GPM | $12.63 |
| Features | |
| Control | Pressure switch |
| Runs dry | Yes |
| Strainer included | Yes |
The best overall pick: a variable-speed 5 GPM pump that keeps the shower steady while other taps open, at well under the price of other variable-speed pumps.
Amazon $159.99A lot of flow and pressure for the money, for big rigs and boats with several fixtures. Check that the wiring can carry its 17 A draw.
Amazon $110.86The highest-flow pump here, 6 GPM at 60 psi, for big boats and multi-bath motorhomes that can feed its 18 A draw.
Amazon $266.47Compare the Wassermann 4WDP5 5.0 GPM 55 psi with any other RV water pump →
More from Wassermann: every Wassermann product ranked.
