SEAFLO 33 Series 24V 3.0GPM 45PSI Water Pressure Pump
DP203004533
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Automatic 24V water pressure for boats and mobile systems
The SEAFLO SFDP2-030-045-33 is a 24V DC three-chamber diaphragm demand pump delivering up to 3.0 GPM (11.3 L/min) at open flow with a 45 PSI shut-off setting. The pressure switch starts the pump when a tap opens and stops it after the system repressurises.
It is intended for freshwater systems on yachts, motorboats, campervans, caravans and remote cabins, typically serving two to three fixtures depending on simultaneous demand and plumbing losses.
General-duty pressure pump features
- Three-chamber diaphragm design for reliable moderate-pressure water delivery.
- Automatic on-demand pressure switch with adjustable setting.
- Self-primes up to approximately 1.8 m suction lift.
- Run-dry capable for accidental loss of supply; avoid deliberate prolonged dry operation.
- Completely rubber mounting base reduces vibration and noise.
- Industry-standard mounting pattern simplifies many replacement installations.
- Suitable for straightforward service and winterisation.
- Designed to meet RoHS, SGS and ISO requirements.
Technical specification
| Manufacturer model | SFDP2-030-045-33 |
| Supply voltage | 24V DC |
| Open flow | 3.0 GPM / 11.3 L/min |
| Shut-off pressure | 45 PSI / 3.1 bar |
| Maximum current draw | 3.40 A |
| Pump type | Three-chamber diaphragm demand pump |
| Self-priming lift | Up to 1.8 m (6 ft) |
| Ports | 1/2-14 MNPT |
| Maximum recommended liquid temperature | 60°C (140°F) |
| Valve / diaphragm material | EPDM / Santoprene |
| Wiring | 16 AWG leads, approximately 114 mm |
| Approximate unit weight | 1.92 kg |
Compatibility and installation checks
- Confirm a 24V DC supply and size the fuse and cable for the 3.40 A maximum draw and cable length.
- Suitable for approximately two to three fixtures where combined demand remains within the pump's installed performance.
- Confirm 1/2-14 MNPT ports, dimensions and mounting footprint before replacing another pump.
- Install an inlet strainer, use flexible hose near the pump and keep the suction line airtight.
- All taps, heaters, filters, accumulators and fittings must tolerate at least 45 PSI and the operating temperature.
- Mount in a dry ventilated service location. The pump is not submersible and is not a bilge pump.
- Package: one 33 Series pump. Confirm pictured fittings/strainer; hose, fuse and main wiring may be separate.
Frequently asked questions
Does it switch on when a tap opens?
Yes. The built-in pressure switch provides automatic demand operation.
How many outlets can it supply?
Typically two to three fixtures, depending on simultaneous demand and plumbing losses.
Can it replace any 24V pressure pump?
No. Compare flow, 45 PSI rating, current, ports, dimensions and mounting pattern.
Can it pump bilge water?
No. It is a dry-mounted diaphragm pressure pump and must not be submerged.
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