Ontop, flues and beyond

An office space with the perfect work climate, a generator or engine operating at maximum capacity without noise disturbance, optimum performance of ovens or commercial kitchens and a home that is warm and comfy. We understand that every build of flue gas system is different, each type typically requiring tailor-made and even innovative solutions.


Silent, hidden from view or rather an architectonic eye catcher. Our customers daily request unique, tailor-made flue gas systems. That is why engineering and product development are the heart of and the driving force behind our organisation.

Take silencers of yacht and cruise ship engines, for instance. Thanks to the substantial noise reduction these silencers allow for optimum comfort on board. In addition, we anticipate the market’s future needs. That is why we developed the EcoStream, amongst other things, a chimney fan with a soot separator for inserts and wood stoves.

Please tell us about the challenges you are facing and let us find an innovative solution together.

‘We are for those who think ahead, go further and go beyond’


Cooperation results in the best ideas. To us the customer is not merely a consumer, but rather a partner in the development of new solutions for flue gas systems. Industrial and marine applications must be tailor made. We take the particular requirements of your product and installation into account. But also the efficient  installation of the flues, such as a lightweight construction and assembly without needing to weld.

‘More will be achieved by working together’

Together with our customers, we seek solutions off the beaten track. When developing a product, we like to think ahead, and we opt for a sustainable product. We take our high-quality production and service one step further, always aiming for the best result and with a view to long-standing customer relationships.  

Please feel free to let one of our engineers think along with your development department


Ontop has ample experience and has developed many stainless-steel flue gas systems for the following segments and uses:

  • Residential: fire places, wood stoves, gas stoves, boilers
  • Commercial Heating: large central heating boilers for buildings and steam boilers for production processes
  • Power Generation: generator sets, CHPs and drive technology
  • Food: industrial ovens (such as tunnel and batch ovens for bakeries), steam boilers and commercial kitchens
  • Marine & Offshore: exhausts for engines of superyachts, cruise ships, platform supply vessels, tow boats etc.
years Ontop


Ontop B.V. at ISH 2019

Ontop B.V. showcases flue gas systems at ISH 2019 in Messe, Frankfurt.

Read more

Rais chooses the quality and design of Metaloterm!

Rais stoves and inserts stand for Danish design of the highest quality. And recently they have added chimney tubes to their collection. Ontop developed a special product line for Rais in the colours black, white, nickel, silver, mocha and platinum.

Read more

Will you visit ISH 2019?

We are delighted to invite you to visit us on Messe Frankfurt in the Hall 11.1, E51 of the ISH Fair.

Read more

More news



Flues and Beyond


Ontop B.V. | Metaloterm
Oude Veerseweg 23
4332 SH Middelburg

T: +31 (0)118 68 99 00
F: +31 (0)118 68 99 99
E info.nl@metaloterm.com

KvK-number: 22019262

VAT-number.: NL 001742887B01

General Terms & Conditions
Privacy Policy
Website overview

Ontop B.V. | Metaloterm

Metaloterm® is a trademark of Ontop B.V.