Johnson Pump Ultima Combo Automatic Bilge Pump, 1250 GPH, 12V

The Johnson Pump Ultima Combo is an automatic submersible bilge pump rated at 1250 gallons per hour, built for boat owners who want reliable, unattended water removal without a mechanical float switch to jam, stick, or corrode over time. Instead of a float arm, the Ultima Combo uses patented Mirus field effect detector cells that create micro-electrical fields to sense disruptions caused by water or other fluids. Because the detector cells are completely sealed, they never make physical contact with water and cannot corrode, giving the switch a longer, more dependable service life than conventional float-activated designs.

The pump itself is a compact, all-in-one motor and impeller unit housed in durable thermoplastic, with a stainless steel (SS2343) shaft supported by a lip seal. The motor is water cooled for energy efficiency and long service intervals, and the housing includes a built-in check valve and a molded T-slot mount for a clean, secure installation. The completely sealed switch design also allows the switch to be located remotely from the pump body, giving installers flexibility in tight bilge compartments.

Electrically, the Ultima Combo runs on a 12 volt system, draws 3 amps, and is rated for a 5 amp fuse. It uses a 1-1/8 inch discharge connection and is recommended to be wired with 16 gauge wire. This is a universal-fit automatic submersible bilge pump suitable for bilge compartments across a wide range of boats.

Specifications

• Brand: Johnson Pump
• Manufacturer Part Number: 08203-00
• Type: Bilge Pump
• Style: Automatic Submersible
• Flow Rate: 1250 Gallons Per Hour (GPH)
• Voltage: 12 volts
• Amperage Draw: 3 amps
• Fuse Size: 5 amps
• Discharge Connection: 1-1/8 inches
• Recommended Wire Size: 16 gauge
• Shaft Seal: Lip Seal
• Shaft Material: Stainless Steel (SS2343)
• Housing Material: Thermoplastic
• Weight: 1 pound

Frequently Asked Questions

How many gallons per hour does the Johnson Pump 08203-00 move? The Johnson Pump Ultima Combo, part number 08203-00, is rated at 1250 gallons per hour.

Does this bilge pump use a float switch? No. The Ultima Combo (08203-00) does not use a mechanical float switch; it relies on patented Mirus field effect detector cells that sense water electronically without ever contacting it.

What voltage and amperage does the Ultima Combo run on? It operates on a 12 volt system and draws 3 amps, with a recommended 5 amp fuse.

Is the Johnson Pump 08203-00 fully automatic? Yes, the Ultima Combo is an automatic submersible bilge pump that activates on its own when it detects water, with no manual switching required.

What size discharge hose fits this pump? The Ultima Combo has a 1-1/8 inch discharge connection.

What wire gauge should be used when installing this pump? Johnson Pump recommends 16 gauge wire for the Ultima Combo (08203-00) installation.

What is the housing and shaft made of? The Ultima Combo has a durable thermoplastic housing and a stainless steel (SS2343) shaft supported by a lip seal.

Can the switch on this bilge pump be mounted away from the pump? Yes. Because the detector cells are completely sealed, the switch on the 08203-00 can be located remotely from the pump body.

Does the Ultima Combo have a check valve built in? Yes, the pump includes a molded check valve as part of its housing design.

How much does the Johnson Pump 08203-00 weigh? The Ultima Combo bilge pump weighs 1 pound.

Why would the detector cells last longer than a float switch? Because the Mirus field effect detector cells on the 08203-00 are completely sealed and never physically contact water, they cannot corrode or jam the way a moving float arm can.

Is this pump submersible? Yes, the Johnson Pump Ultima Combo is designed as an automatic submersible bilge pump.