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 3.4. The Wassermann 4WDP5 5.0 GPM 55 psi leads on value and features. The Jabsco Par-Max HD6 wins on flow and pressure. The Wassermann 4WDP5 5.0 GPM 55 psi costs $203.31 less ($63.16 vs $266.47).
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.
Jabsco Par-Max HD6
#4 in 4 GPM and upFull review
The highest-flow pump here, 6 GPM at 60 psi, for big boats and multi-bath motorhomes that can feed its 18 A draw.
Amazon $266.47$266.47
Which should you buy?
- Choose the Wassermann 4WDP5 5.0 GPM 55 psi for value ($12.63 per GPM ($63.16, 5 GPM) vs $44.41 per GPM ($266.47, 6 GPM)) and features (runs dry without damage, strainer included vs thermal protection).
- Choose the Jabsco Par-Max HD6 for flow (6 GPM rated open flow vs 5 GPM rated open flow) and pressure (60 psi shut-off vs 55 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 | Jabsco Par-Max HD6 |
|---|---|---|
| Overall rating | 3.6/5 | 3.4/5 |
| Value 25% | 100 $12.63 per GPM ($63.16, 5 GPM) | 30 $44.41 per GPM ($266.47, 6 GPM) |
| Flow 20% | 75 5 GPM rated open flow | 100 6 GPM rated open flow |
| Pressure 15% | 71 55 psi shut-off | 86 60 psi shut-off |
| Efficiency 10% | 50 maximum current draw not published (neutral score used) | 24 0.33 GPM per amp (18 A max) |
| Features 15% | 30 runs dry without damage, strainer included | 15 thermal protection |
| Warranty 15% | 0 warranty not published, scored as none | 67 3-year warranty |
Specifications
| Wassermann 4WDP5 5.0 GPM 55 psi | Jabsco Par-Max HD6 | |
|---|---|---|
| Performance | ||
| Rated open flow | 5 GPM | 6 GPM |
| Shut-off pressure | 55 psi | 60 psi |
| Max current draw | - | 18 A |
| Price per GPM | $12.63 | $44.41 |
| Self-priming lift | - | 7 ft |
| Features | ||
| Control | Pressure switch | Pressure switch |
| Diaphragm chambers | - | 5 |
| Runs dry | Yes | - |
| Thermal protection | - | Yes |
| Strainer included | Yes | - |
| Build | ||
| Weight | - | 7 lb |
| Warranty | - | 3 years |