PowerMax 3.0 GPM 55 psi RV Pump
#3 in Under 4 GPMFull review
A cheaper stand-in for the Shurflo 4008 with the same flow, pressure and bypass. Seaflo’s 42 Series is cheaper still with a longer warranty.
Amazon $74$74
The PowerMax 3.0 GPM 55 psi RV Pump is the better RV water pump overall, rated 3.3 to 2.8. The PowerMax 3.0 GPM 55 psi RV Pump leads on features, value and pressure. The Johnson Pump Aqua Jet WPS 3.5 wins on warranty and flow. The PowerMax 3.0 GPM 55 psi RV Pump costs $63.49 less ($74 vs $137.49).
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.
Johnson Pump Aqua Jet WPS 3.5
#5 in Under 4 GPMFull review
A marine pressure pump with a 3-year warranty, for boats where 41 psi is plenty. RV owners after a firmer shower should look at 55 psi pumps.
Amazon $137.49$137.49
Which should you buy?
- Choose the PowerMax 3.0 GPM 55 psi RV Pump for features (internal bypass, runs dry without damage, thermal protection vs none of the listed features), value ($24.67 per GPM ($74, 3 GPM) vs $39.28 per GPM ($137.49, 3.5 GPM)) and pressure (55 psi shut-off vs 41 psi shut-off).
- Choose the Johnson Pump Aqua Jet WPS 3.5 for warranty (3-year warranty vs 2-year warranty) and flow (3.5 GPM rated open flow vs 3 GPM rated open flow).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every under 4 GPM RV water pump; a clear win is highlighted. How we rank explains each one.
| Factor weight | PowerMax 3.0 GPM 55 psi RV Pump | Johnson Pump Aqua Jet WPS 3.5 |
|---|---|---|
| Overall rating | 3.3/5 | 2.8/5 |
| Value 25% | 68 $24.67 per GPM ($74, 3 GPM) | 38 $39.28 per GPM ($137.49, 3.5 GPM) |
| Flow 20% | 25 3 GPM rated open flow | 38 3.5 GPM rated open flow |
| Pressure 15% | 71 55 psi shut-off | 31 41 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% | 55 internal bypass, runs dry without damage, thermal protection | 0 none of the listed features |
| Warranty 15% | 33 2-year warranty | 67 3-year warranty |
Specifications
| PowerMax 3.0 GPM 55 psi RV Pump | Johnson Pump Aqua Jet WPS 3.5 | |
|---|---|---|
| Performance | ||
| Rated open flow | 3 GPM | 3.5 GPM |
| Shut-off pressure | 55 psi | 41 psi |
| Price per GPM | $24.67 | $39.28 |
| Self-priming lift | 9 ft | - |
| Features | ||
| Control | Pressure switch | Pressure switch |
| Internal bypass | Yes | - |
| Runs dry | Yes | - |
| Thermal protection | Yes | - |
| Build | ||
| Weight | 4 lb | 4.5 lb |
| Warranty | 2 years | 3 years |