SEAFLO | 33 Series | Automatic Demand Diaphragm Pump | 11.3 LPM at 45 PSI | 12v

SEAFLO 33 Series 12V Automatic Demand Diaphragm Pump

The SEAFLO 33 Series 12V Automatic Demand Diaphragm Pump is a compact, reliable water pressure pump. It is designed for caravans, motorhomes, campervans, boats, catering vans, and mobile water systems.

Delivering up to 11.3 LPM / 3.0 GPM with a 45 PSI pressure rating, this SEAFLO water pump is ideal for freshwater systems that need strong, consistent water flow. It is suitable for taps, showers, sinks, and the general onboard water supply.

It is also a popular Shurflo alternative pump. This model is suitable as an upgrade or replacement for selected Shurflo 105, 2088, 2095, 3901, and Trail King series pumps.

Reliable 12V Water Pump for Caravans, Motorhomes and Boats

The SEAFLO 33 Series is designed for mobile and marine environments where dependable water pressure matters. Whether you are touring in a motorhome, fitting out a campervan, or upgrading a caravan water system, this 12V diaphragm pump offers a practical and cost-effective solution. You can also use it when replacing a boat’s freshwater pump.

Its automatic demand operation means the pump starts when you open a tap and stops when you close it. This helps create a more convenient water system without needing manual switching each time you want water.

Key Features

• 12V automatic demand diaphragm pump
• 11.3 LPM / 3.0 GPM flow rate
• 45 PSI pressure rating
• Suitable for caravans, motorhomes, campervans, boats, and mobile water systems
• Ideal for taps, sinks, showers, and freshwater outlets
• Automatic start/stop operation when outlets are opened or closed
• Compact design for easier installation in confined spaces
• Popular replacement option for selected Shurflo pump models

Popular Shurflo Alternative Pump

If your existing Shurflo pump has failed, become noisy, lost pressure, or is no longer performing as expected, the SEAFLO 33 Series is a strong alternative to consider.

This model is commonly chosen as a replacement for selected Shurflo pump ranges, including:

• Shurflo 105 Series
• Shurflo 2088 Series
• Shurflo 2095 Series
• Shurflo 3901 Series
• Shurflo Trail King Series

Before ordering, always check your current pump label, voltage, pressure rating, flow rate, fittings, and available installation space to make sure the replacement is suitable for your setup.

Ideal for Freshwater Systems

The SEAFLO 33 Series 12V water pump is suitable for many freshwater applications, including:

• Caravan water systems
• Motorhome taps and showers
• Campervan conversions
• Boat freshwater systems
• Catering vans and mobile sinks
• Off-grid water systems
• Small utility water setups

Its flow rate and pressure make it a practical choice for typical onboard water systems where users need dependable pressure without overcomplicating the installation.

Automatic Demand Operation

This pump is designed to work on demand. When a tap, shower, or outlet is opened, the pump activates automatically. When the outlet is closed, the pump stops.

This makes everyday use simple and efficient, especially in caravans, motorhomes, campervans, and boats, where space and power management are important.

What to Check Before Replacing Your Pump

To choose the correct replacement pump, check the following before ordering:

• Voltage: this model is 12V, so it should be used with a suitable 12V system
• Flow rate: match your old pump or choose a suitable upgrade based on your system
• Pressure: this model is rated at 45 PSI
• Fittings: check your existing inlet and outlet connections
• Mounting space: Make sure there is enough room for installation
• Application: confirm whether your system is freshwater, marine, caravan, motorhome, or another use type

Why Choose the SEAFLO 33 Series?

The SEAFLO 33 Series offers a strong balance of performance, price, and reliability. It is powerful enough for many leisure vehicles and marine freshwater systems, while remaining compact and straightforward to install.

For buyers comparing Seaflo pumps vs Shurflo, this model is one of the most popular choices. This is because it delivers the key performance needed for everyday water use without the higher cost often associated with premium replacement pumps.

Buy the SEAFLO 33 Series 12V Water Pump from Thermo Technica

Order the SEAFLO 33 Series 12V Automatic Demand Diaphragm Pump from Thermo Technica for a reliable caravan, motorhome, campervan, or marine water pump replacement.

If you are unsure whether this pump is suitable for your existing system, check your old pump specification or contact Thermo Technica before ordering.

You can also browse our full range of SEAFLO pumps in the UK for diaphragm pumps, bilge pumps, washdown pumps, and other water system options.

SEAFLO 33 Series FAQs

What can I use the SEAFLO 33 Series pump for?

You can use the SEAFLO 33 Series for freshwater pressure systems in caravans, motorhomes, campervans, boats, catering vans, and mobile water setups.

Does the SEAFLO 33 Series run on 12V?

Yes, this SEAFLO 33 Series model runs on a 12V system and works as an automatic demand diaphragm pump.

How much water does the SEAFLO 33 Series pump deliver?

The SEAFLO 33 Series delivers up to 11.3 litres per minute, which equals approximately 3.0 gallons per minute.

What pressure does the SEAFLO 33 Series provide?

The SEAFLO 33 Series provides 45 PSI, which suits many caravan, motorhome, campervan, and marine freshwater systems.

Can the SEAFLO 33 Series replace a Shurflo pump?

Yes, many users choose the SEAFLO 33 Series as a Shurflo alternative pump. It can replace selected Shurflo 105, 2088, 2095, 3901, and Trail King series pumps when the voltage, flow rate, pressure, fittings, and installation space match your system.

Can I use the SEAFLO 33 Series in a motorhome?

Yes, you can use the SEAFLO 33 Series in many motorhome freshwater systems. Check your voltage, flow rate, pressure, fittings, and available installation space before fitting it.

Can I use the SEAFLO 33 Series on a boat?

Yes, you can use the SEAFLO 33 Series in suitable boat freshwater systems. Check your voltage, fittings, pressure requirements, and installation space before installation.

What should I check before replacing my old pump?

Check your old pump’s voltage, flow rate, pressure rating, fittings, mounting space, and application before you order a replacement.