Centrifugal bilge pumps use an impeller to move water, ideal for high flow rates and low-pressure applications.

Diaphragm bilge pumps utilize a flexible membrane to displace water, suitable for handling debris and dry running.

Electric submersible bilge pumps are compact, self-priming, and commonly used for automatic water removal in marine vessels.

Types of Bilge Pumps for Boats and Marine Pumps:

1. Manual Bilge Pumps: - Size: Typically 1.5" to 2" discharge diameter - Grade: Marine-grade materials - Viscosity: Suitable for water and light oils - Buoyancy: N/A (manual operation) - Material: Stainless steel, brass, or reinforced plastic

2. Electric Bilge Pumps: - Size: 1" to 3" discharge diameter - Grade: IPX8 waterproof rating - Viscosity: Handles water and moderate debris - Buoyancy: Float switch included for automatic operation - Material: Thermoplastic, bronze, or stainless steel

3. Centrifugal Bilge Pumps: - Size: 1.5" to 4" discharge diameter - Grade: High-capacity marine use - Viscosity: Best for clean water, not for thick fluids - Buoyancy: Requires external float switch - Material: Cast iron, bronze, or polypropylene

4. Diaphragm Bilge Pumps: - Size: 1" to 2.5" discharge diameter - Grade: Self-priming and dry-run capable - Viscosity: Handles viscous fluids and debris - Buoyancy: Optional float switch - Material: Rubber diaphragm, aluminum, or stainless steel

5. Submersible Bilge Pumps: - Size: 1" to 3" discharge diameter - Grade: Fully submersible (IP68) - Viscosity: Water and light oils - Buoyancy: Built-in float switch - Material: Thermoplastic or corrosion-resistant metals

6. High-Capacity Marine Pumps: - Size: 3" to 6" discharge diameter - Grade: Heavy-duty commercial use - Viscosity: Handles water, fuel, and sludge - Buoyancy: External sensors or manual control - Material: Bronze, stainless steel, or reinforced composites