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.