Navien 60/100 500mm Flue Extension Flat Roof Supports three‑phase systems with one

Supports three‑phase systems with one unit per phase

This includes water held in the cylinder coil

The eGarc combustion control system continuously analyses the flame signal and adjusts gas valve and fan to maintain optimal CO₂ levels at all times — regardless of supply gas quality or seasonal variation

Outer PVC sleeve protects during installation

Navien 60/100 500mm Flue Extension Flat Roof Supports three‑phase systems with oneThe Navien 60 100 500mm Flue Extension is a genuine 500mm length of 60 100mm concentric flue pipe, used to extend a flue run to the required length for safe, compliant venting. Whether reaching a more distant external wall, clearing an obstruction, or fine tuning a vertical roof run, this extension slots directly into Navien's existing 60 100mm push fit flue system and is compatible across the full range of Navien boilers. 500mm Extension Length 60