100% NZ Custom Made Boat & Motorhome Tanks

Marine Tanks

Hercules Tanks designs water, waste and fuel tanks for boats of all shapes and sizes worldwide

Motorhome Tanks

All custom made to suit all the different styles of Motorhomes, Caravans, Horse Trucks, Vans, Ute trays and Buses


Hercules Tanks are specialists in plastic engineering and can design & manufacture almost anything you require

We can customise your tank for a motorhome or boat

Hercules Tanks offers a complete design, construction and fitting service for all types of tanks, including:

Bespoke 100% Virgin Plastic Tanks

High Density Polyethylene (HDPE) has a high molecular weight, used for all fuel tanks. Using the thermoplastic polymer-formed method, we are able to easily cut, fold and weld all tanks inside and out, eliminating the number of joins needed to make a near seamless tank. HDPE is lightweight yet super strong, very low moisture absorption, easily mouldable and resistant to corrosive chemicals and recyclable.

Polypropylene (PP) is used for all types of water tanks. PP is a food grade plastic material which will not taint fresh water and it does not allow odour absorption so ideal for waste/sewage water tanks. Lightweight, super strong and recyclable.

Welding Rod: All our welding rod is made in-house. This enables use of the same HDPE or PP as the tank being manufactured.

Recyclable: All our HDPE and PP plastic is sourced locally from PRO-FORM in Hamilton (a division of ARB New Zealand).  HDPE is fully recyclable using plastic code 2. PP is fully recyclable using plastic code 5. PRO-FORM practices lean manufacturing. PRO-FORM takes back all processed offcuts to be used into their internal applications.

“Please thank Steve - appreciated his willingness to help out and the time spent to sort our motorhome. Service was excellent.”

“I would like to thank Hercules Tanks for the great job they did on creating a ‘one off’ 200L tank for our yacht. It fitted into the desired space like a glove. The tank was beautifully made and all the thread holes on the tank are in the correct place and accept all the fittings as specified in the plan. Communication was easy, the tank was built before the given date and arrived by courier one day after the given date for completion - to Seaview Marina, Wellington. I thought the price of the tank was very realistic for a ‘one off’ product. This is the second time I have used this company and I would have no hesitation to use again. Once again that you for a great job.”

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