Wassermann 4WDP5 5.0 GPM 55 psi
#3 in 4 GPM and upFull review
The cheapest high-flow pump here by a wide margin. Buy it as a budget upgrade if you can live without a published warranty.
Amazon $63.16$63.16
The Wassermann 4WDP5 5.0 GPM 55 psi is the better RV water pump overall, rated 3.6 to 3.3. The Wassermann 4WDP5 5.0 GPM 55 psi leads on flow and pressure. The Wassermann 3WDP4 4.0 GPM 45 psi costs $3.17 less ($59.99 vs $63.16).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
Wassermann 3WDP4 4.0 GPM 45 psi
#7 in 4 GPM and upFull review
A low-cost 4 GPM pump for a trailer owner who wants more flow than the stock pump. Its sibling 5 GPM model costs only a few dollars more.
Amazon $59.99$59.99
Which should you buy?
- Choose the Wassermann 4WDP5 5.0 GPM 55 psi for flow (5 GPM rated open flow vs 4 GPM rated open flow) and pressure (55 psi shut-off vs 45 psi shut-off).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every 4 GPM and up RV water pump; a clear win is highlighted. How we rank explains each one.
| Factor weight | Wassermann 4WDP5 5.0 GPM 55 psi | Wassermann 3WDP4 4.0 GPM 45 psi |
|---|---|---|
| Overall rating | 3.6/5 | 3.3/5 |
| Value 25% | 100 $12.63 per GPM ($63.16, 5 GPM) | 100 $15 per GPM ($59.99, 4 GPM) |
| Flow 20% | 75 5 GPM rated open flow | 50 4 GPM rated open flow |
| Pressure 15% | 71 55 psi shut-off | 43 45 psi shut-off |
| Efficiency 10% | 50 maximum current draw not published (neutral score used) | 50 maximum current draw not published (neutral score used) |
| Features 15% | 30 runs dry without damage, strainer included | 30 runs dry without damage, strainer included |
| Warranty 15% | 0 warranty not published, scored as none | 0 warranty not published, scored as none |
Specifications
| Wassermann 4WDP5 5.0 GPM 55 psi | Wassermann 3WDP4 4.0 GPM 45 psi | |
|---|---|---|
| Performance | ||
| Rated open flow | 5 GPM | 4 GPM |
| Shut-off pressure | 55 psi | 45 psi |
| Price per GPM | $12.63 | $15 |
| Features | ||
| Control | Pressure switch | Pressure switch |
| Runs dry | Yes | Yes |
| Strainer included | Yes | Yes |