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 3.6. The Seaflo 56A Variable Speed 5.0 GPM leads on features and pressure. The Wassermann 4WDP5 5.0 GPM 55 psi wins on value. The Wassermann 4WDP5 5.0 GPM 55 psi costs $96.83 less ($63.16 vs $159.99).
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.
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
Which should you buy?
- Choose the Seaflo 56A Variable Speed 5.0 GPM for features (variable speed, internal bypass, runs dry without damage vs runs dry without damage, strainer included) and pressure (70 psi shut-off vs 55 psi shut-off).
- Choose the Wassermann 4WDP5 5.0 GPM 55 psi for value ($12.63 per GPM ($63.16, 5 GPM) vs $32 per GPM ($159.99, 5 GPM)).
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 | Wassermann 4WDP5 5.0 GPM 55 psi |
|---|---|---|
| Overall rating | 4.2/5 | 3.6/5 |
| Value 25% | 51 $32 per GPM ($159.99, 5 GPM) | 100 $12.63 per GPM ($63.16, 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) | 50 maximum current draw not published (neutral score used) |
| Features 15% | 75 variable speed, internal bypass, runs dry without damage | 30 runs dry without damage, strainer included |
| Warranty 15% | 100 4-year warranty | 0 warranty not published, scored as none |
Specifications
| Seaflo 56A Variable Speed 5.0 GPM | Wassermann 4WDP5 5.0 GPM 55 psi | |
|---|---|---|
| Performance | ||
| Rated open flow | 5 GPM | 5 GPM |
| Shut-off pressure | 70 psi | 55 psi |
| Max current draw | 10 A | - |
| Price per GPM | $32 | $12.63 |
| Self-priming lift | 6 ft | - |
| Features | ||
| Control | Variable speed | Pressure switch |
| Diaphragm chambers | 5 | - |
| Internal bypass | Yes | - |
| Runs dry | Yes | Yes |
| Strainer included | - | Yes |
| Build | ||
| Warranty | 4 years | - |