EZ-Fit Internal Vertical Balanced Flues (White System)

Grant EZ-Fit White System - VerticalVertical balanced flue kits share the same EZ-Fit boiler connections as our high level kits. The unique clamping system on the vertical balanced flue ensures easy assembly thereby reducing installation costs

As with our high level kits it is now possible to create offsets in straight flue runs by using our 45° elbows and adjustable extension kits – increasing the versatility of this new range.

Vertical balanced flues can be extended to a maximum length of 6 metres on non-condensing boilers and 12 metres on condensing boilers in a straight run using extension kits. Deduct one metre for each additional 45° elbow used [maximum 4 elbows].


  • Suitable for Grant Vortex boilers up to 70kW
  • Maximum total flue length = 12 metres (Deduct 1 metre for each additional 45° elbow used)
  • Supplied as a complete kit
  • Unique connection system ensures easy assembly
  • 150mm flue pipe diameter for boilers up to 26kW
  • 180mm flue diameter for boilers from 26-70kW
  • Extensions available in 225mm, 450mm or 950mm fixed lengths and a 275-450mm adjustable length
  • Optional 1 metre extended flue terminal
  • Pitched or flat roof flashings in aluminium or lead available (click here to read more about Grant’s range of roof flashing)
  • Possible to create offsets in straight flue runs by using our 45° elbows and extensions

Case Studies

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Grant biomass boilers are keeping installers busy

The social media feeds of Dryad Energy Ltd have been filled with red recently – red Grant Spira biomass (wood pellet) boilers! Dryad Energy has been incredibly busy installing Spira boilers in domestic properties throughout the South with photos from these installs occupying their newsfeeds. We have been speaking toRead More

Clean and Efficient – Spira gets the thumbs up in Hampshire

The pioneering Grant Spira range of biomass boilers are clean, efficient and easy to use, making them the perfect alternative to anyone looking to replace an older solid or fossil fuelled heating system. The Grant Spira is a fully automatic self-feeding and self-cleaning biomass boiler that performs much like anRead More

It is easy being green with a Grant biomass boiler

We revisit a factory in West Yorkshire which upgraded its existing heating system with a Grant biomass boiler just over two years ago. Installed under the non-domestic Renewable Heat Incentive (RHI), the Spira is not only keeping the factory warm but also significantly reducing the premises’ fuel costs and generatingRead More