Glow-Worm Essential Combi

With over 80 years of boiler manufacturing experience, Glow-worm are the pioneers of heating solutions in the UK. A part of Europe’s largest domestic heating group Vaillant, Glow-worm products are created by Europe’s top heating engineers. 

Glow-worm’s Essential Combi boiler range has been designed around quality, performance and value. This powerful combi boiler is brilliant for those on a budget. It is made with top quality materials and has some excellent features, yet comes at a very reasonable price. 

If you are looking for a new combi boiler for your small to medium home, read ahead for our opinion on the Essential Combi boiler.

How Much Does The Essential Combi Cost?

The Essential Combi comes in either a 24kW or 28kW power output, so the price of the boiler will depend on which one your home needs. The boiler should cost in and around £620 to £665, including VAT, depending on the kW output and where you source your boiler from. 

This is a very reasonable price for a top-quality combi boiler. However, it is essential to note that this does not include installation costs; these are usually pretty high. You can double the price of the boiler to get an idea of what the total cost of the boiler plus installation fees may look like.

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Is This Boiler Suitable for My Home?

The Essential Combi is suitable for smaller to medium homes for several reasons. First of all, it is a combi boiler, so it does not need a hot water cylinder or loft storage tanks; you only need room for the boiler itself. This makes it an excellent option for homes with limited storage space. 

Secondly, as it is a combi boiler, it instantly heats water from the mains, so it will struggle with the higher hot water demands of larger homes. As a general rule, the 24 kW is suited to smaller apartments or homes with 1 bathroom and up to 10 radiators, while the 28kW is suited to medium-sized homes with 1 bathroom with no more than 15 radiators. 

Every home has different heating and hot water needs, so it is essential to consult a heating engineer before deciding on your new boiler. They will come and survey your homes boiler use and be able to recommend the right boiler type and kW output for your home. 

Replace Your Existing Boiler With Glow-worm’s Essential Combi

The good news for you and for your installer is that the Essential Combi has been designed for an easy installation. An efficient installation will save you a lot of time and money on installation costs. 

The Essential Combi is exceptionally lightweight, thanks to its aluminium heat exchanger. It is also pretty small, meaning your installer can easily lift it into place. It can be wall-mounted and is compatible with the full range of Glow-worm’s flues, adding to the ease of this boiler’s installation.

Boiler Energy Efficiency

One of the most important things to consider when choosing a new boiler is its energy efficiency. A high-efficiency boiler will save you a lot of money on your gas bill, and it will make your home more environmentally friendly by reducing your carbon emissions. 

The Essential Combi is highly efficient, boasting a SEBDUK energy efficiency rating of 89.3%, and an ErP A-rating for heating. This high efficiency is thanks to its revolutionary Grundfos modulating heat pump, which adapts to your homes heating needs, reducing energy use and saving you money. 

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Essential Combi Controls & Features

The Essential Combi is a simple boiler that is very easy to use. It comes with a bright, clear LCD display where you can easily monitor the boiler’s status, even in a dark cupboard. This combi boiler also includes a built-in analogue clock, a simple feature that allows you to set your boiler’s on/off times easily. 

The Essential Combi is compatible with a vast range of smart heating controls, such as Glow-worm’s Climastat, or the MiGo personal heating assistant. These smart heating systems can significantly enhance the functionality and efficiency of your boiler.

How Long Is The Warranty On This Boiler?

The Essential Combi comes with a pretty average 3-year parts and labour warranty. However, Glow-worm has a brilliant incentive; when your boiler is installed by a Club Energy registered installer, you have the option to extend this warranty. 

The warranty will cover the costs of any parts that need to be repaired and the labour costs of calling out an engineer to make repairs. Make sure to read up on the terms and conditions to avail of the full benefits of this warranty. 

Essential Combi By Size & Price

This combi boiler isn’t the smallest combi boiler out there. It’s dimensions are; 740 mm (H) x 418 mm (W) x 300 mm (D), meaning it won’t fit it in a kitchen cupboard like other models. However, you will easily find space to store this boiler as it doesn’t require extra water storage tanks. 

Features & Benefits

The Essential Combi boiler range comes with some nice additional features. These features help to enhance the longevity, efficiency, and reliability of this boiler. Here are some of this combi boiler’s best features; 

Aluminium Heat Exchanger Boosts boiler performance and prolongs the life of the boiler. 
Grundfos Modulating Heat PumpReduces energy wastage and saves on bills.
Built-in Analogue TimerEasily set your boiler’s timetable.
Compatibility with Smart Controls Increase the boiler’s efficiency.

The quality materials of this boiler, such as the aluminium heat exchanger, are what make for a reliable and long-lasting boiler. The Grundfos heat pump is an excellent feature that not only reduces energy use but will also save you money on gas bills. 

The Essential Combi’s compatibility with smart controls and it’s built-in analogue timer make it a pleasure to operate. These controls allow great freedom and peace of mind, knowing that your boiler can be monitored and controlled from your smartphone or smart thermostat. 

Smart Heating Controls

Smart heating controls have completely changed how many of us operate our home heating systems today. Smart thermostats allow you to control your home heating system from your smartphone; this means you have complete control over your boiler wherever, whenever. 

Smart thermostats can help make your boiler more efficient by learning your home’s energy needs and creating a heating programme to optimise boiler use. Some smart thermostats even register the weather outside and use this to influence which boiler settings should be operated. 

Glow-worm has a huge range of smart heating controls, including its own app; MiGo. MiGo can assist in reducing your gas bills and carbon emissions by creating an optimised heating schedule made uniquely for your home. 

Does The Essential Combi Work With Google Nest?

Yes, Nest, the smart thermostat from Google can be combined with the Essential Combi boiler, giving the homeowner the freedom to control their boiler on the go. 

Does The Essential Combi Work With Hive?

Yes, the Essential Combi is compatible with Hive smart heating controls. Hive can help in reducing your gas bill and carbon emissions by creating a heating programme made specifically for your home. 

Does The Essential Combi Work With Tado?

Yes, the Essential Combi can be used with Tado smart heating controls in order to control your home heating system from your smartphone.

Is the Glow-worm Essential Combi Any Good?

The Essential Combi from Glow-worm is hard to fault. It is a reliable, long-lasting and highly efficient boiler made in the UK. It is compact, stylish, and operates quietly, so it will be unobtrusive wherever you decide to store it in your home. For homeowners looking for a new combi boiler on a budget, the Essential Combi is a truly excellent choice. 

Pros and Cons

Before deciding whether the Essential Combi is the right boiler for your home, have a look at our pros and cons below.


The pros of the Essential Combi; 

  • Easy to install and maintain; cut down on installation and maintenance costs. 
  • Grundfos modulating heat pump; eliminates unnecessary boiler use. 
  • Highly energy-efficient; save money on heating costs and reduce carbon emissions. 
  • Compatible with smart heating controls; increase the functionality and efficiency of the boiler. 
  • Built-in analogue timer; easily set a heating schedule for your boiler.


Despite the pros of the Essential Combi, there are some cons that are important to acknowledge; 

  • 3-year warranty; unless you plan to get the Essential Combi installed by a Club Energy installer, the warranty is pretty short. 

Is Boiler Finance Available?

Yes, you can easily buy this boiler on boiler finance, and the interest rates are very low. 

Do I Need Boiler Cover?

It is highly recommended to get boiler cover. Boiler replacement costs can be very expensive, and when boiler cover is purchased, these costs can be avoided.

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