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Combi Boilers by Glow-worm

High-Efficiency Combi Boilers for Every Home

Combi boilers are one of the most popular types of boilers on the market. They're incredibly compact and energy-efficient, delivering high performance heating and hot water almost instantly.

When you choose a Glow-worm combi boiler, you’re choosing the best for your home, and your family. We are a trusted manufacturer of high-efficiency combi and condensing boilers. In fact, we developed the technology for the very first mass-produced condensing combi boiler in the 1990s, so you know you’re in safe hands.

Browse our range below and buy your new combination boiler from Glow-worm.

Need a little help? Don’t hesitate to contact us online, or give our friendly team a call on 0345 602 2922 and we’d be happy to answer any questions you might have.

*Please note: Our extended guarantees are available when installed and registered by a Club Energy installer. Find an installer near youto take advantage of this offer.

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7 years Get 7 years guarantee out of the box

Energy Combi Boilers

ErP A rated small combi boiler

  • ErP A rated for efficiency - helping you to reduce your energy bills
  • Compact size will fit in kitchen cupboards
  • Highly efficient for lower running costs

Energy 35 Store combi boilers (Discontinued)

35kW Combi Boiler

  • ErP A rated for efficiency - helping you to reduce your energy bills
  • Instant, unlimited hot water
  • LPG compatible

Ultimate₃ combi boilers

High efficiency combi boiler from Glow-worm

  • Leading combi boiler offering outstanding performance
  • ErP A rated for efficiency – helping you to reduce your energy bills
  • Up to 10 years guarantee*

Betacom₄ Combi Boilers

Exclusive, great value combi with a 5 year guarantee*

  • Value for money, high performance combi range
  • ErP A rated for efficiency - helping you to reduce your energy bills
  • FREE 5 year guarantee*

Easicom₃ Combi Boilers

ErP A rated combi boiler with a FREE 3 year guarantee*

  • ErP A rated boiler for efficiency – helping to lower your energy bills
  • Reliable performance
  • Competitively priced

Essential Combi Boilers (Discontinued)

Quality, Performance and Value

  • Exceptional value for money combi range
  • FREE 3 year guarantee with option to extend*
  • Sold with analogue timer and flue

Energy LPG Combi Boiler (Discontinued)

ErP A rated small combi boiler

  • Cupboard fit
  • Highly efficient for lower running costs
  • Instant hot water supply

Compact Combi Boiler

Great things come in small packages

  • Reliable performance
  • Most lightweight boiler we've ever produced
  • Cupboard fit

Compact Combi LPG Boiler

Great performance packed into small proportions

  • Reliable performance
  • Most lightweight boiler we've ever produced
  • Cupboard fit

Flexicom (Discontinued)

Compact Combi Boiler

  • Compact design fits into cupboards
  • Ideal for small houses
  • 5 second hot water response

Flexicom (Discontinued)

Compact and flexible Combi Boiler

  • High Efficiency & NOx Class
  • Optional direct rear flue
  • Fits standard kitchen cupboard

Ultracom₂ (Discontinued)

Exceptional, Prime Combi Boiler

  • Ultra quiet operation
  • 5 second hot water response
  • High Efficiency with a NOx Class 5 rating

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What is a combi boiler and how does one work?

A combi boiler provides central heating and hot water from one compact appliance. Unlike other types of boiler, there’s no need for a separate hot water storage tank with a combination boiler – water is taken directly from the mains supply to offer heating and hot water almost immediately when it’s needed.

Take a look at our comprehensive guide to combi boilers for more information.

Should I buy a new combi boiler?

Our new combi boilers are highly energy- and cost-efficient. As they’re compact and don’t need any separate tanks, they save space in your home but can still provide near-instant heating and hot water. The process of installing a combination boiler is also cheaper and easier than with other boiler types.

That said, if you have several bathrooms that need hot water at the same time, then a regular or system boiler might be a better choice for your home. A regular (heat-only) boiler will also work more effectively if your water pressure is low.

See our combi boiler guide to find out more about whether this type of boiler would be suited to your home.

Which type of combination boiler is right for my home?

Before you buy a new combi boiler, we recommend that you base your choice of model on the size of your home and the number of bedrooms and bathrooms:

  • For smaller homes and apartments with up to two bedrooms and one bathroom, our super-compact 25kW boilers like the Compact Combi Boiler will help you to maximise your available space whilst keeping you warm.
  • Larger homes with up to four bedrooms and two bathrooms will find that our 30kW combi boilers, including our most popular Energy Combi Boiler, are the perfect match for your needs.
  • If your home has five+ bedrooms, or an increased demand for hot water, our 35kW boilers such as the Energy 35 Combi won’t break a sweat – even if you do!

Glow-worm combi boiler guarantees

Many Glow-worm combination boilers come with a free parts and labour guarantee of between three and seven years, depending on which model you pick (see the product information above for more details).

You can also opt to extend your guarantee provided that your new combination boiler is installed and registered by a Club Energy installer. Find an installer near you when you buy a combi boiler to take advantage of this offer.