Twin Wall Flue

Stainless steel twin wall insulated flue systems.

Holetherm is a high quality all fuel chimney flue system manufactured in stainless steel (316 inner and 304 outer wall) to the highest quality standards. Insulation between the walls is provided by a high temperature resistant fibre mat.


The products are manufactured in an ISO 9001 certified factory and the system is CE marked and certified for use in all fuel systems when installed according to the fixing recommendations supplied with each item. Continuous laser welding of all the key seams ensures an exceptionally high quality finish and reliability in construction and use.
Tested and certified to BSEN-1856-1:2009 and HETAS listed


On going and substantial investment by the company in automated processing has resulted in highly competitive production costing and resultant value pricing for the user.

Construction and dimensions

The system is assembled from a range of standard parts illustrated in the following pages. The push fit and locking band system has been tried and tested over more than 25 years and has been installed in over 100,000 homes in Europe. Available in 2 standard internal diameters 125 and 150mm, and 7 made to order diameters 175, 200, 250, 300, 350, 400 and 450mm.
Installation instructions are supplied with each component.


All parts are available with free next day delivery (popular sizes only) from our warehouse.