Seaflo 21-Series
Score: 72/100
Hygger 660 GPH Submersible Pump
Score: 70/100Rankings
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.
The Hygger 660 GPH Submersible Aquarium Water Pump (HG919-2500) is a black metal, oil-free magnetic driven pump designed for efficient water circulation in aquariums, ponds, and hydroponic systems. It features a bottom intake design that allows for operation with as little as 1 inch of water, making it suitable for draining tanks and cleaning debris down to low water levels. While it offers excellent quiet operation, its limited head height and lack of adjustable modes are notable trade-offs.
| Attribute | | |
|---|---|---|
1.2 GPM | 11 GPMbest | |
35 PSIbest | — | |
4 ftbest | — | |
12 V | 110 Vbest | |
0.4 HPbest | 0.08 HP | |
4 Abest | — | |
140 °Fbest | — | |
| ↓ lower better | 1.25 lbsbest | 1.43 lbs |
Click an attribute name to sort · Green = best, red = worst (relative to this comparison)
| Attribute | | |
|---|---|---|
Performance & Power(6) | ||
Flow Rate (GPM) | 1.2 GPM | 11.0 GPM |
Max Pressure (PSI) | 35 PSI | N/A PSI |
Voltage (V) | 12 V | 110 V |
Horsepower (HP) | 0.4 HP | 0.08 HP |
Max Amperage (A) | 4.0 A | N/A A |
Duty Cycle (%) | Intermittent % | N/A % |
Features & Protection(3) | ||
Dry-Run Protection | true | false |
Thermal Protection | true | N/A |
Pressure Switch | true | false |
Build & Durability(4) | ||
Motor Type | Permanent Magnet | Magnetic |
Weight (lbs) | 1.25 lbs | 1.43 lbs |
Diaphragm Material | Santoprene | N/A |
Valve Material | EPDM | N/A |
Installation & Compatibility(4) | ||
Self-Priming Lift (ft) | 4 ft | N/A ft |
Max Liquid Temperature (°F) | 140 °F | N/A °F |
Port Size (in) | 0.375 in | 1.0 in |
Frequency (Hz) | DC Hz | 50-60 Hz |
Products in the top-left offer the best value (high score, low price).
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.
“as quiet as a whisper”
“spongy flow feel”
Professional reviewers and editors lack dedicated expert reviews from major outlets like Aquarium Co-Op or BRS. However, manufacturer and retailer descriptions emphasize the pump's ultra-quiet efficiency, bottom cleaning capabilities, and energy-saving design. Video demonstrations highlight strong performance for large tanks, though some note a 'spongy' flow feel on higher models. The DC variant is positioned as high-performance for low-water circulation with significant energy savings.
Direct consumer reviews are absent from the available data. Indirect feedback via product pages and video demos emphasizes powerful quick water changes, low noise levels described as 'as quiet as a whisper', and reliable bottom cleaning. Users appreciate the versatility of multi-size fittings for large setups, though some note that the flow feels less consistent ('spongy') on higher settings.
