Holetherm Double-walled Flue Gas Exhaust System – Lewo’s Bestseller!

The Holetherm double-walled flue gas exhaust system is our best-selling Lewo product. Thanks to the double insulated layer, the channel remains cool on the outside, which significantly increases (fire) safety.The Holetherm double-wall flue gas exhaust system is certified according to the applicable European CE product requirements in compliance with NEN-EN 1856-1. Additionally, production is subject to periodic inspection by Kiwa Netherlands.

Click here: More information about Holetherm Double-walled insulated (DW)

Construction schedule

LEWO offers a 30-year warranty on the Holetherm double-wall insulated flue gas exhaust system. (except for chimney fires. Only our flagship system of Holetherm Evolution "EVO" comes with a guarantee even in the event of a chimney fire.)

For nearly 40 years, this system has proven to be very safe and is made from durable, fully recyclable material.