Seapower Marine is the appointed Cummins UK main dealer for marine propulsion and auxiliary engines and generators, including the Onan product range. We have been working with Cummins and their products since 2004. Dedicated to supporting the brand, we supply main equipment, parts, service work and technical expertise around the world.

We supply commerical craft including passenger vessels, fishing boats, windfarm support vessels, tugs, pilot boats, dredgers, inland waterways, charter yachts and recreational craft.
Our warehouse holds extensive stocks of genuine service and spare parts, propulsion engines and Onan generators, whilst our fully equipped workshop undertakes upfit, spraying and repair and overhaul work.

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 extensive stocks of parts for these proudcts as well as Fleetguard, Mercury Marine, Volkswagen Marine, Marine 16, Rydlyme and Beta Marine.


CURRENT PROJECT – Conversion of Onan MDD 50kW sets from Single Phase Negative to 3Phase ISO. Converted sets are tested on Load Bank before export.

We offer a wide range of Onan conversions where applicable, covering a number of options such as Phasing, Grounding and Voltage. All machines are load bank tested before shipment, with new data plates and Certificates of Conformity. We also record and store video footage of testing for each machine.

Many of our projects can be viewed on the Projects Tab.

TECHNICAL RESOURCES – We hold extensive documentation for all of the products we supply such as Data Sheets, Fuel Ratings, Installation Manuals and Warranty documents. Files can be found and downloaded under the Technical Tab of the website.

If you are having difficulty finding information, please contact us on +44 (0)1473 780090 or send us an email.