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Glow-worm Essential Combi Boilers 24kW or 28kW

The Glow-worm Essential Combi is a simple A-rated gas boiler that is suitable for small to medium-sized properties.

In addition to being an easy-to-use gas condensing boiler, Glow-worm’s Essential Combi is one of the most competitively priced combination boilers around today. It has some fancy components, is available in two heat outputs and does not need any separate tanks or cylinders. This boiler is also super-efficient and has an A rating for energy efficiency, so it could shrink your energy bills whilst keeping your home warm and comfortable.

How Much Does this Boiler Cost?

This boiler comes in an output of 24kW or 28kW and will set you back around £620 or £660. As you’ve probably guessed, the larger model is the more expensive of the two. You’ll also need to find out the fitting cost, which can vary greatly depending on a number of things. The only way to save on these costs is to compare prices. You may even find that some companies or installers are willing to beat cheaper quotes that you’ve obtained elsewhere, so don’t be afraid to ask about this when shopping around.

How will I know if this Boiler is Suitable for My Home?

Like all combination boilers, the Essential Combi by Glow-worm doesn’t require a cold water tank or a hot water storage cylinder because it takes water from the mains. This is one of the reasons why combi boilers are commonly found in flats and small to medium-sized houses that don’t have much storage or loft space to play with. Although the most popular type of boiler in the UK, combi boilers struggle to supply hot water to more than one shower or bath at the same time, so this boiler isn’t ideal if you have a large house with multiple bathrooms.

You can find out if the Essential Combi is the perfect solution for your needs by asking a Gas Safe registered engineer to visit your property. If they go on to recommend this boiler, your engineer will also be able to tell you the correct size (kW output) of boiler for your home.

Is it a High Efficiency Boiler?

The Glow-worm Essential Combi is indeed a highly efficient boiler with an A-rated ErP energy efficient label. What does this mean? Well, it basically means that the boiler has the potential to reduce your energy bills and lower your carbon footprint, especially if you want to replace a particularly old boiler. One of the great things about this boiler is that it can be used with the full range of optional Glow-worm controls to improve system efficiency.

Does this Boiler have a Good Range of Controls and Features?

It’s a simple combi boiler with a bright LCD display and a selection of controls that includes switches to allow you to adjust heating and hot water temperatures as and when you need. Optional controls can be purchased, such as wired or wireless thermostats and the MiGo personal heating assistant. If you like the idea of being able to control your heating and hot water using a smartphone, the MiGo app-based control will not disappoint. Moving onto features and components, the boiler has an in-built analogue timer and a powerful aluminium heat exchanger to provide excellent performance. This boiler also comes complete with a modulating Grundfos pump that helps to reduce energy use by adapting the system output to match heating demand.

How long is the Warranty on this Boiler?

Glow-worm’s Essential Combi comes with a 3-year parts and labour warranty as standard, but this can be extended if you hire a Club Energy installer to fit the boiler.

Glow-worm Essential Combi Boilers Prices and Sizes

ModelTypeDimensionsMaximum Flow RateOutputEfficiency RatingTypical Price
Essential Combi 24CombiH – 740 mm
W – 418 mm
D – 300 mm
10 l/min24 kWA 90% and above£620
Essential Combi 28CombiH – 740 mm
W – 418 mm
D – 300 mm
11.7 l/min28 kWA 90% and above£660

Summary of Important Information

  • Priced between £620 and £660
  • Heating output of 24kW or 28kW
  • Hot water flow rates of 10 or 11.7 litres per minute
  • Dimensions of 740mm (H) x 418mm (W) x 300 (D)
  • Uses gas as its fuel source
  • A-rated for efficiency
  • Smart compatible
  • 3-year warranty as standard

Pros and Cons

If your budget is tight and you’re looking for a fairly decent boiler upgrade, the Glow-worm Essential Combi could be ideal for your home and lifestyle. We’ve put together a list of pros and cons below, but you must remember to consult a Gas Safe engineer before you make any decisions.


  • Suited to small to medium-sized homes
  • No need for separate cylinder or loft tanks
  • Easy to use and service
  • In-built analogue timer – allows you to set the heating on and off times
  • Grundfos pump – reduces energy use and fuel bills
  • Powerful aluminium heat exchanger – reliable performance
  • Provides maximum energy efficiency – reduce fuel bills and carbon emissions
  • Compatible with a range of intelligent controls – improves efficiency and performance
  • Compatible with the MiGo app-based control – maximises efficiency, learns your energy needs and allows you to manage your heating and hot water from anywhere


  • Glow-worm boilers have an overall Which? score of 54%
  • 3-year warranty – would prefer a longer standard guarantee
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