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 2.0. The Seaflo 33 Series 3.0 GPM 45 psi leads on value, pressure and flow. The Seaflo 33 Series 3.0 GPM 45 psi costs $61.81 less ($52.99 vs $114.80).
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.
Shurflo Aqua King II Junior 2.0
#11 in Under 4 GPMFull review
A small, low-draw pump for a single galley tap on a boat or van. Its 2 GPM at 30 psi is too little for an RV with a shower.
Amazon $114.80$114.80
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 $57.40 per GPM ($114.80, 2 GPM)), pressure (45 psi shut-off vs 30 psi shut-off) and flow (3 GPM rated open flow vs 2 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 | Shurflo Aqua King II Junior 2.0 |
|---|---|---|
| Overall rating | 3.6/5 | 2.0/5 |
| Value 25% | 89 $17.66 per GPM ($52.99, 3 GPM) | 13 $57.40 per GPM ($114.80, 2 GPM) |
| Flow 20% | 25 3 GPM rated open flow | 0 2 GPM rated open flow |
| Pressure 15% | 43 45 psi shut-off | 0 30 psi shut-off |
| Efficiency 10% | 50 maximum current draw not published (neutral score used) | 92 0.57 GPM per amp (3.5 A max) |
| Features 15% | 45 runs dry without damage, thermal protection, strainer included | 20 runs dry without damage |
| Warranty 15% | 100 4-year warranty | 0 warranty not published, scored as none |
Specifications
| Seaflo 33 Series 3.0 GPM 45 psi | Shurflo Aqua King II Junior 2.0 | |
|---|---|---|
| Performance | ||
| Rated open flow | 3 GPM | 2 GPM |
| Shut-off pressure | 45 psi | 30 psi |
| Max current draw | - | 3.5 A |
| Price per GPM | $17.66 | $57.40 |
| Self-priming lift | 6 ft | - |
| Features | ||
| Control | Pressure switch | Pressure switch |
| Diaphragm chambers | 3 | - |
| Internal bypass | - | No |
| Runs dry | Yes | Yes |
| Thermal protection | Yes | - |
| Strainer included | Yes | - |
| Build | ||
| Warranty | 4 years | - |