Seaflo 21-Series
Score: 72/100
Seaflo 43-Series
Score: 88/100Rankings
The Seaflo 43 Series is a compact, self-priming 12V DC diaphragm pump designed for marine, RV, and off-grid water systems, delivering up to 3.0 GPM at 55 PSI. It features internal bypass technology and Variable Flow Technology to minimize cycling and noise while eliminating the need for an external accumulator tank. It is ideal for medium-duty, battery-powered water systems in RVs and boats requiring consistent pressure for multiple outlets.
The Seaflo 21 Series is a compact 12V DC diaphragm pump designed for on-demand water pressure in mobile applications like RVs and boats, delivering 1.2 GPM at 35 PSI. It features self-priming capabilities and a built-in pressure switch for automatic operation. It is best suited for RV and caravan owners needing portable water pressure for 1-2 fixtures where battery efficiency is critical.
| Attribute | | |
|---|---|---|
1.2 GPM | 3 GPMbest | |
35 PSI | 55 PSIbest | |
4 ft | 6 ftbest | |
12 Vbest | 12 Vbest | |
0.4 HPbest | — | |
4 A | 6.86 Abest | |
140 °Fbest | 140 °Fbest | |
| ↓ lower better | 1.25 lbsbest | — |
Click an attribute name to sort · Green = best, red = worst (relative to this comparison)
| Attribute | | |
|---|---|---|
Performance & Power(4) | ||
Flow Rate (GPM) | 1.2 GPM | 3.0 GPM |
Max Pressure (PSI) | 35 PSI | 55 PSI |
Max Amperage (A) | 4.0 A | 6.86 A |
Duty Cycle (%) | Intermittent % | Continuous % |
Build & Durability(1) | ||
Motor Type | Permanent Magnet | Diaphragm |
Installation & Compatibility(2) | ||
Self-Priming Lift (ft) | 4 ft | 6 ft |
Port Size (in) | 0.375 in | 0.75 in |
Professional reviewers and editors highlight the Seaflo 21 Series as a professional-grade solution for marine and RV applications, praising its efficient low current draw and high capacity output.
Everyday users commonly praise the pump for its strong initial flow and ease of setup. However, recurring complaints include priming issues if not level, increased noise under high demand, and reduced lifespan when used with dirty water.
Professional reviewers and editors praise the Seaflo 43 Series as an exceptional value for low-flow marine and RV applications, highlighting its innovative internal bypass technology for reducing noise and cycling.
Everyday users and reviewers express high satisfaction with the pump's ease of installation and powerful flow rate. Common praise includes the ability to handle RV and camper demands effectively, with users noting the quiet, no-cycling operation in off-grid setups.
“best budget 12V water pump”
“great pumping power”
