📦 12V 1100GPH Automatic Submersible Bilge Pump – Marine Water Removal for Boats, RVs & Yachts
Keep your bilge dry and your boat safe with this fully automatic 1100 GPH submersible pump. Designed for 12V marine electrical systems, it moves up to 4,160 liters per hour—enough capacity to handle sudden rain downpours, stuffing box drips, and routine deck drainage without running your battery flat. The integrated float switch eliminates the need for an external controller: the pump cycles on automatically when water rises to a preset level and shuts off once the bilge is clear, so you don't have to monitor it manually. With a compact footprint and a discharge port diameter of 10 mm (inner) to 29 mm (outer), it fits snugly into tight bilge spaces on runabouts, fishing boats, pontoon boats, and small yachts. The durable thermoplastic body shrugs off saltwater, oil, and fuel residue, making it a year‑round workhorse for your onboard water management system. Whether you're replacing a failed original pump, upgrading a manual switch system, or adding redundancy to an offshore‑capable vessel, this bilge pump delivers the automatic reliability that peace of mind demands.
⚠️ Maintenance Tip: Test the float switch operation monthly by pouring clean water into the bilge until the pump activates. Clear any debris from the intake screen to ensure unrestricted flow.
✨ Key Features of 1100GPH Automatic Bilge Pump
- Fully Automatic Operation: Built‑in float switch senses water level and activates the pump without the need for a separate panel or manual switch.
- High Flow Rate – 1100 GPH: Moves approximately 4,160 liters per hour, rapidly evacuating rainwater, wave splash, or minor leaks.
- 12V DC Low Power Draw: Optimized for marine batteries—runs efficiently without draining your house bank during extended automatic cycling.
- Compact Submersible Design: Small enough to drop into crowded bilge compartments; fully submersible with sealed motor housing.
- Corrosion‑Resistant Thermoplastic Body: Handles saltwater, diesel, oil traces, and cleaning chemicals without rusting or degrading.
- Multi‑Purpose Drainage: Also suitable for RV gray water, fish box drainage, bait tank circulation, and utility sump removal.
📏 Specifications – 12V Automatic Bilge Pump
| Voltage |
12V DC |
| Flow Rate |
1100 GPH (~4,160 L/H) |
| Outer Discharge Port Diameter |
29 mm |
| Inner Discharge Port Diameter |
10 mm |
| Body Material |
Thermoplastic (corrosion-resistant) |
| Switch Type |
Integrated automatic float switch |
| Application |
Bilge water removal, RV wastewater, fish box drainage, sump pumping |
| Compatible Vessels |
Runabouts, fishing boats, pontoon boats, small yachts, RVs |
| Package Includes |
1 × automatic submersible bilge pump (12V 1100GPH) |
❓ Frequently Asked Questions – Automatic Bilge Pump
Q: How does the automatic float switch work, and do I need to install a separate switch?
A: The built‑in float mechanism activates the pump when water rises to a certain level and shuts it off once the bilge is nearly dry. No external switch or panel is required—simply connect it to a fused 12V power source. However, many boat owners also wire a manual override switch for testing or emergency use.
Q: How do I size the discharge hose for the 10mm inner and 29mm outer port?
A: The 29 mm outer diameter is the barbed fitting size—use a hose with an inner diameter of approximately 1 inch (25 mm) that will stretch over the barb and be secured with a stainless steel hose clamp. The 10 mm inner diameter refers to the flow opening. Match your hose to the barb OD for a watertight fit.
Q: Will this pump run my battery down if it cycles frequently?
A: The pump draws power only when actively running. Under normal conditions—intermittent rain or minor stuffing box drips—the total power consumption is negligible. If you dock in a marina with shore power, a battery maintainer will offset any usage. For mooring‑only boats, a small solar panel easily keeps up with pump cycling.
Q: Can I install this pump in a location where oil or fuel may be present in the bilge water?
A: Yes. The thermoplastic housing and seals are resistant to diesel, gasoline, and oil residues. However, be aware of local environmental regulations—discharging oily bilge water overboard is illegal in most waters. Always use an oil‑absorbent sock or a separate oil‑water separator if needed.
Q: How do I clean the intake screen if debris blocks the pump?
A: The pump body features an intake grate at the base. Remove the pump from its mounting bracket, rinse the screen with fresh water, and use a soft brush to clear any trapped debris. Check the screen monthly, especially if your bilge collects pet hair, leaves, or fishing line.
