Eco NHTW Information


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Eco NHTW

Available in 125mm (5") and 150mm (6"), Eco NHTW is a twin wall insulated chimney system specifically designed for use on stoves with continuous operating temperatures up to 450 deg C. The system is designed so that the outer case is load bearing and the inner liner is free to expand independently to accommodate temperature change.

Eco NHTW Description

  • Twist-lock bayonet jointing system, secured by locking band

  • Advanced corrosion resistant design and construction uses laser welded 316L stainless steel inner liner and stainless steel case.

  • The 25mm of high density rockwool insulation maintains flue gas temperature, maximising efficiency, improving flue distraught on start up and minimising condensation. 

  • Low external case temperature. 

  • The inner liner is free to expand through the female collar, allowing for maximum thermal expansion even during a soot fire.

  • The inner liner has an inward bead at the female end which acts as a capillary break preventing moisture being drawn through the joint.


Eco NHTW Specifications

  • Manufactured under a Quality Manahement Scheme approved to BS EN ISO 9001: 2008

  • 4 hour fire rating to BS476 Part 20

  • Certified for corrosion resistance on gas, oil, and Solid Fuel by MPA and TÜV

  • HETAS listed for use on solid fuel applications.

High Temperature Applications
T450 NI W V2 L50050 G60
T450 NI D V3 L50050 G60
T450 NI W V2 L50050 G50
T450 NI D V3 L50050 G50

60mm Distance to combustibles
in a combustible shaft
50mm Distance to combustibles
in a non combustible shaft
or in free air