Seapower Marine is the main Cummins UK dealer for marine engines and generators. The Cummins marine diesel engines are available from 4.5L to 15L as both propulsion or auxiliary. We also supply generators up to 99kW including the Onan Quiet Diesel product range. We have been working with Cummins and their products since 2004 and we are dedicated to supporting the brand and its customers. We are passionate about the Cummins range and work hard to supply from stock: main equipment, parts, service work and offer technical expertise around the world.

We supply most commerical craft including passenger vessels, fishing boats, windfarm support vessels, tugs, pilot boats, dredgers, inland waterways, charter yachts and recreational vessels.
Our warehouse holds extensive stocks of genuine service spare parts for propulsion and auxillary engines and Onan generators. Our fully equipped workshop undertakes upfit work, spraying, repairs and overhaul work. We keep marine diesel engines and Onan generators in stock from our UK warehouse.

We are really pleased to unveil our first corporate video

We are really pleased to unveil our first corporate video, a vibrant showcase of Seapower Marine’s journey, culture, and the people behind our success. Watch our video here.The video highlights our commitment to [...]

read more

We supply Cummins diesel engines and Onan generators; ZF and TwinDisc gearboxes and Halyard exhaust systems supporting commercial boat builders, shipyards, blue water cruising yacht designers, such as Oyster Yachts and recreational marine users both in the UK and around the world. We hold over 5,000 stock parts for these proudcts including Fleetguard, Mercury Marine, Volkswagen Marine, Marine 16, Rydlyme and Beta Marine.

Click here for more information

The NEW CUMMINS – Marine Diesel Cummins Turbo (MDCT) genset.
This robust genset can be fitted with either the low or high kW Cummins B4.5 auxiliary engine, giving genset ratings of 40 kWe – 80 kWe and 80 kWe – 110 kWe respectively. The MDCT generator set is available for orders now with estimated delivery in late 2023.

This powerful genset pairing is small but mighty and available in both 50 Hz and 60 Hz models. Using the Cummins Onan Digital Display, this genset provides user-friendly diagnostics including extensive engine and alternator information, ensuring customer ease on the water. The MDCT genset is available for both commercial and recreational marine applications and compliant with EPA Tier 3 and EU Stage V regulations.


NEW 3rd Party Multi-functioning Display – Introducing the Poseidon ® 7 – a versatile, third-party display system that caters to customers seeking a sleeker and more stylish option than the commercial Cummins ED4 unit. This 7″ integrated monitoring and control system is available in both N2K and J1939 formats (with adapter unit) and works perfectly with the Cummins C-Command Connect operating system. Customisable to display relevant information based on vessel requirements, the Poseidon ® 7 is ideal for boats ranging from 25 – 60 ft.