Glow-Worm Ultimate3 35kW Combi Boiler – With Horizontal Flue & Power Filter

The Glow-Worm Ultimate3 35kW Combi Boiler is a powerful, energy-efficient heating solution built for medium-sized homes that demand reliable central heating and instant hot water. Supplied complete with a horizontal flue kit and integrated power filter, this package gives heating engineers and homeowners everything needed for a clean, professional installation straight out of the box.

The Ultimate3 combines high-efficiency performance with low emissions, helping to reduce fuel bills while keeping your heating system protected. The integrated power filter captures damaging debris and magnetite from the system water — extending boiler life, reducing maintenance call-outs, and keeping the system running at peak efficiency for longer.


Key Features

  • 35kW Heat Output – Powerful combi performance ideal for medium-sized homes with multiple bathrooms
  • Instant Hot Water on Demand – No cylinder required; hot water delivered directly to taps and showers
  • Integrated Power Filter – Protects the heat exchanger and system components from magnetite and debris, reducing wear and maintenance costs
  • Horizontal Flue Included – Flexible installation options for a variety of property types and boiler positions
  • High Efficiency, Low Emissions – Designed to reduce fuel consumption and carbon output
  • Quiet Operation – Advanced engineering minimises noise for a comfortable home environment
  • Compact Design – Space-saving footprint suitable for kitchen cupboards and utility rooms
  • User-Friendly Controls – Intuitive interface for straightforward day-to-day operation

Technical Specifications

  • Brand: Glow-Worm
  • Model: Ultimate3
  • Boiler Type: Combi (Combination)
  • Heat Output: 35kW
  • Fuel Type: Natural Gas
  • Flue Type: Horizontal (included)
  • Filter: Integrated Power Filter (included)
  • Warranty: Manufacturer’s standard warranty — please refer to Glow-Worm documentation for full terms

What’s in the Box

  • 1 x Glow-Worm Ultimate3 35kW Combi Boiler
  • Horizontal flue kit
  • Integrated power filter
  • Installation and commissioning manual
  • User guide

Note: Installation must be carried out by a Gas Safe registered engineer in accordance with current Building Regulations and the manufacturer’s instructions.

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