Seaflo 33 Series 3.0 GPM 45 psi
#2 in Under 4 GPMFull review
The cheapest way to a 3 GPM pump with a 4-year warranty. Buy it for a travel trailer when a firm 55 psi shower isn’t a priority.
Amazon $52.99$52.99
The Seaflo 33 Series 3.0 GPM 45 psi is the better RV water pump overall, rated 3.6 to 2.8. The Seaflo 33 Series 3.0 GPM 45 psi leads on value, features and warranty. The Johnson Pump Aqua Jet WPS 3.5 wins on flow. The Seaflo 33 Series 3.0 GPM 45 psi costs $84.50 less ($52.99 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 Seaflo 33 Series 3.0 GPM 45 psi for value ($17.66 per GPM ($52.99, 3 GPM) vs $39.28 per GPM ($137.49, 3.5 GPM)), features (runs dry without damage, thermal protection, strainer included vs none of the listed features) and warranty (4-year warranty vs 3-year warranty).
- Choose the Johnson Pump Aqua Jet WPS 3.5 for 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 | Seaflo 33 Series 3.0 GPM 45 psi | Johnson Pump Aqua Jet WPS 3.5 |
|---|---|---|
| Overall rating | 3.6/5 | 2.8/5 |
| Value 25% | 89 $17.66 per GPM ($52.99, 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% | 43 45 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% | 45 runs dry without damage, thermal protection, strainer included | 0 none of the listed features |
| Warranty 15% | 100 4-year warranty | 67 3-year warranty |
Specifications
| Seaflo 33 Series 3.0 GPM 45 psi | Johnson Pump Aqua Jet WPS 3.5 | |
|---|---|---|
| Performance | ||
| Rated open flow | 3 GPM | 3.5 GPM |
| Shut-off pressure | 45 psi | 41 psi |
| Price per GPM | $17.66 | $39.28 |
| Self-priming lift | 6 ft | - |
| Features | ||
| Control | Pressure switch | Pressure switch |
| Diaphragm chambers | 3 | - |
| Runs dry | Yes | - |
| Thermal protection | Yes | - |
| Strainer included | Yes | - |
| Build | ||
| Weight | - | 4.5 lb |
| Warranty | 4 years | 3 years |