Seaflo 56A Variable Speed 5.0 GPM
#1 in 4 GPM and upFull review
The best overall pick: a variable-speed 5 GPM pump that keeps the shower steady while other taps open, at well under the price of other variable-speed pumps.
Amazon $159.99$159.99
The Seaflo 56A Variable Speed 5.0 GPM is the better RV water pump overall, rated 4.2 to 3.1. The Seaflo 56A Variable Speed 5.0 GPM leads on value, pressure and features. The Shurflo Aqua King II Supreme 5.0 wins on efficiency. The Seaflo 56A Variable Speed 5.0 GPM costs $199.10 less ($159.99 vs $359.09).
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 Supreme 5.0
#9 in 4 GPM and upFull review
A high-flow marine pump that is easy on the batteries for its 5 GPM. It is the most expensive pump here.
Amazon $359.09$359.09
Which should you buy?
- Choose the Seaflo 56A Variable Speed 5.0 GPM for value ($32 per GPM ($159.99, 5 GPM) vs $71.82 per GPM ($359.09, 5 GPM)), pressure (70 psi shut-off vs 55 psi shut-off) and features (variable speed, internal bypass, runs dry without damage vs internal bypass, runs dry without damage, thermal protection, strainer included).
- Choose the Shurflo Aqua King II Supreme 5.0 for efficiency (0.71 GPM per amp (7 A max) vs 0.50 GPM per amp (10 A max)).
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 | Seaflo 56A Variable Speed 5.0 GPM | Shurflo Aqua King II Supreme 5.0 |
|---|---|---|
| Overall rating | 4.2/5 | 3.1/5 |
| Value 25% | 51 $32 per GPM ($159.99, 5 GPM) | 0 $71.82 per GPM ($359.09, 5 GPM) |
| Flow 20% | 75 5 GPM rated open flow | 75 5 GPM rated open flow |
| Pressure 15% | 100 70 psi shut-off | 71 55 psi shut-off |
| Efficiency 10% | 71 0.50 GPM per amp (10 A max) | 100 0.71 GPM per amp (7 A max) |
| Features 15% | 75 variable speed, internal bypass, runs dry without damage | 65 internal bypass, runs dry without damage, thermal protection, strainer included |
| Warranty 15% | 100 4-year warranty | 0 warranty not published, scored as none |
Specifications
| Seaflo 56A Variable Speed 5.0 GPM | Shurflo Aqua King II Supreme 5.0 | |
|---|---|---|
| Performance | ||
| Rated open flow | 5 GPM | 5 GPM |
| Shut-off pressure | 70 psi | 55 psi |
| Max current draw | 10 A | 7 A |
| Price per GPM | $32 | $71.82 |
| Self-priming lift | 6 ft | 6 ft |
| Features | ||
| Control | Variable speed | Pressure switch |
| Diaphragm chambers | 5 | 4 |
| Internal bypass | Yes | Yes |
| Runs dry | Yes | Yes |
| Thermal protection | - | Yes |
| Strainer included | - | Yes |
| Build | ||
| Warranty | 4 years | - |