Our History

Sigma’s first range of products were soakers, flashings, flues and fish smokers.  Over time as other sheet metal companies were acquired the product range has increased.

From its humble beginnings in 1997 with less than 5 staff, Sigma Sheetmetal Products now has over 40 employees and is the leading manufacturer of custom hot water cylinders in New Zealand. 


Sigma Sheetmetal Products ltd lineage can be traced back to Triumph Sheetmetal Works ltd founded by Jim Hinchco.

Triumph Sheetmetal Works ltd manufactured hot water cylinders in their factory located at 18 Princes street, Onehunga.


Triumph Sheetmetal Works ltd was sold by the Hinchco family and became Triumph Industries.  Triumph Industries purchased various other companies at the time, one of them being Renaissance who had a varied portfolio of products including being the Apple Computer agents in New Zealand. 


Triumph Industries changed its name to Renaissance Corporation.


Renaissance Corporation started selling off some of its business units. Mark Jorey, an employee of Renaissance Group since 1981 bought a small part of the sheetmetal business, named it Sigma Sheetmetal Products Ltd (Sigma) and setup a factory in 16a Hill street, Onehunga, around the corner from the original Triumph Sheetmetal Works factory.


the Eden tool box range was integrated into the product range.


the Triumph Hot Water product range was acquired by Sigma and the legacy of Triumph branded hot water cylinders being manufactured in Onehunga was revived. 

The Company

Sigma Sheetmetal Products is proudly New Zealand owned and operated.  At Sigma, we have a motto of “If you can draw it we can make it!”.  Sigma has a team of vastly experienced and skilled craftsmen that have the ability to fabricate almost anything from sheet metal.  We regularly make custom cylinders, soakers, flashings and other items for our clients.

Mark Jorey


Owner and founder of Sigma Sheetmetal Products. Mark has a vast knowledge base on hotwater heating solutions, flues and building products and is regularly consulted for his expertise. Mark is a keen outdoors man, hunter and fisher who has featured several times on the cover of NZ Fishing magazine.

Shane Parsons​


Shane runs the business on a daily basis. Shane has worked for the company for over 16 years, starting as the sales representative and worked his way up the ranks to General Manager. Shane is knowledgeable on hotwater heating, flues and building products.​

Johno Jorey​


Johno continues the family legacy of working in the Sheetmetal business. Johno has worked for Sigma for over 10 years and has a passion to use technology to improve productivity. Johno is an integral part of the team ensuring that all of the systems are operating correctly and also supports the inbound sales team.​

Chris Jorey​


Chris manages the team that fabricates custom metal work which can be anything from beer dispenser towers to film props. Chris is heavily involved in the manufacturing process and ensures that the machinery is working efficiently in the factory. Chris, like his father, is a keen hunter and fisherman.​

Patrick Loxhay​

Sales and Marketing Manager​

Patrick is the newest member of the team and looks after the channel sales and marketing. Patrick travels around the country visiting the customers keeping them up to date and collating market feedback. In his spare time Patrick is a keen golfer who will happily accept any invites to play golf!​

Ashley Selfe​


Ashley has worked for Sigma for over 15 years, originally starting out in the warehouse and now works in the front office. Ashley manages most of the inbound sales enquiries. Outside of work Ashley competes in Waka Ama competitions.​

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