How Much Does a New Glow-worm Boiler Cost with Installation?

For instance, the type and size of the Glow-worm boiler you choose, as well as the complexity of removing your old heating system, will influence the overall cost of the installation.

This table provides an approximate installation cost for a new Glow-worm boiler.

Boiler Type	Approximate cost of boiler	Approximate cost of installation	Approximate total cost
Combi (24-28kW) for small to medium homes	£550-£800	£1,200	£1,750-£2,000
Combi (30-35kW) for medium homes	£750-£1,000	£1,200	£1,950-£2,200
System (12-18kW) for small to medium homes	£800-£1,200	£1,700	£2,500-£2,900
System (20-25kW) for medium to large homes	£1,050-£1,150	£1,700	£2,750-£2,850
Regular (15-18kW) for small to medium homes	£900-£1,050	£1,700	£2,650-£2,750
Regular (20-25kW) for medium to large homes	£950-£1,100	£1,700	£2,650-£2,800

These prices are estimated based on online research. To get a more accurate quote for your Glow-worm boiler installation, it’s best to get quotes from at least 2-3 Gas Safe registered installers. You can also use the WhatPrice Boiler Installation Cost Calculator for a gas boiler estimate for your specific home.

Overview of Glow-worm boilers and their reputation

Why choose a Glow-worm boiler?

Glow-worm boilers are among the most budget-friendly options available, yet they still deliver effective and efficient heating and hot water for homes across the UK.

The company is dedicated to constantly improving its product range, using premium components to design high-performance boilers that work effortlessly with energy-saving controls and accessories.

Who makes Glow-worm boilers?

Company background

A proudly British brand, Glow-worm has been designing and manufacturing boilers since 1934. The company started at Derwent Foundry in Derbyshire, where they still operate today in the town of Belper. Glow-worm was acquired by Vaillant Group (Europe’s second largest heating company) in 2001, but Glow-worm boilers are still manufactured in the UK.

Types of Glow-worm boilers

Glow-worm offers a range of models, including five combi boilers, three system boilers, and three regular boilers with heat outputs ranging from 15kW to 35kW.

Glow-worm combi boilers

Combi boilers are compact, all-in-one units that take water directly from the mains. They supply hot water for both heating and domestic use as needed, offering convenience and energy efficiency by heating water only when it’s required.

However, since combi boilers don’t store hot water, they may have difficulty maintaining water pressure when multiple taps are used at once. This makes them less suitable for larger homes or households with higher hot water demands.

Glow-worm’s range of gas combi boilers includes boilers for small, medium and large homes including:

• Compact Combi Boiler* (24kW, 28kW)
• Energy Combi Boiler (25kW, 30kW, 35kW)
• Ultimate3 Combi Boiler (30kW, 35kW)
• Easicom3 Combi Boiler (24kW, 28kW)
• MicraCom Combi Boiler (24kW, 28kW)

*Also available as LPG.

Glow-worm system boilers

System boilers also take water directly from the mains, but they work in conjunction with a hot water cylinder, typically stored in an airing cupboard. The cylinder stores the hot water produced by the boiler, ensuring a greater volume of hot water is available to supply multiple radiators, taps, or showers simultaneously, without impacting water pressure.

Glow-worm’s range of gas system boilers includes boilers for small, medium and large homes including:

• Energy System Boiler (12kW, 15kW, 18kW, 25kW, 30kW)
• Ultimate3 System Boiler (25kW)
• Easicom3 System Boiler (25kW)

While the boiler will only provide hot water for your central heating, it can be used with a hot water cylinder to provide hot water for your home.

Glow-worm regular boilers

Regular boilers (also known as heat-only, traditional, or conventional boilers) are similar to system boilers in that they work alongside a hot water cylinder, allowing them to supply multiple water outlets simultaneously.

The main difference between a system and a regular boiler is that regular boilers don’t draw water from the mains. Instead, they rely on a large cold water feeder tank, typically located in the attic.

Regular boilers were the original design before technology allowed for direct mains connections, which typically offer stronger water pressure. Despite this, regular boilers can still be a reliable Glow-worm heating solution in modern homes, particularly in areas with low mains water pressure.

Glow-worm’s range of gas regular boilers includes boilers for small, medium and large homes including:

• Energy Regular Boiler (12kW, 15kW, 18kW, 25kW, 30kW)
• Ultimate3 Regular Boiler (25kW)
• Easicom3 Regular Boiler (25kW)

Glow-worm boiler models and price guide

The price of a Glow-worm boiler model will depend on the model that you choose and by the size of the boiler you need based on your hot water usage. Here are some approximate Glow-worm combi boiler prices, excluding installation.

Glow-worm combi boiler prices

Model	Average Price
Compact Combi Boiler 24kW	£650
Compact Combi Boiler 28kW	£750
Energy Combi Boiler 25kW	£1,050
Energy Combi Boiler 30kW	£1,100
Energy Combi Boiler 35kW	£1,150
Ultimate3 Combi Boiler 30kW	£950
Ultimate3 Combi Boiler 35kW	£1,000
Easicom3 Combi Boiler 24kW	£750
Easicom3 Combi Boiler 28kW	£800
MicraCom Combi Boiler 24kW	£550
MicraCom Combi Boiler 28kW	£600

Glow-worm system boiler prices

Model	Average Price
Energy System Boiler 12kW	£1,050
Energy System Boiler 15kW	£1,100
Energy System Boiler 18kW	£1,150
Energy System Boiler 25kW	£1,200
Energy System Boiler 30kW	£1,250
Ultimate3 System Boiler 25kW	£950
Easicom3 System Boiler 25kW	£800

Glow-worm regular boiler prices

Model	Average Price
Energy Regular Boiler 12kW	£950
Energy Regular Boiler 15kW	£1,000
Energy Regular Boiler 18kW	£1,050
Energy Regular Boiler 25kW	£1,100
Energy Regular Boiler 30kW	£1,150
Ultimate3 Regular Boiler 25kW	£1,100
Easicom3 Regular Boiler 25kW	£900

Comparison of prices across models

From this research, Glow-worm’s cheapest boiler models are combi boilers, followed by regular boilers, with system boilers being the most expensive.

However, it’s important to remember that these prices do not include the cost of installation which will be impacted by the complexity of the work involved.

Best Glow-worm boilers for different homes

You now have a good idea of how much a Glow-worm boiler is going to cost, but which of the boilers on offer is right for your home and lifestyle?

To ensure you are making a smart choice, it’s worth consulting with a few installers who will assess your home’s size and your hot water usage. Gas boilers should always be installed by Gas Safe engineers.

Here is a summary of Glow-worm boiler models and where they are best suited.

Best combi boiler for small homes and apartments

The Compact or MicraCom Combi boilers by Glow-worm is often recommended for small homes and apartments as it is very compact in its design. Combi boilers provide heating and hot water on demand, so there is no need for a storage cylinder which is ideal for homes where space is limited.

Best system boiler for family homes

Family homes with a higher demand for hot water might consider the Glow-worm Energy System boiler 35kW or the Ultimate3 System boiler 25kW. The boiler provides hot water for your central heating while a separate hot water cylinder (usually stored in an airing cupboard) stores hot water so you have access to a higher volume of hot water for baths and showers without losing pressure.

Best regular boiler for large homes

The Glow-worm Ultimate3 Regular 25kW or the Easicom3 Regular 25kW could be a suitable choice for larger homes with a feed tank of water in the attic and a hot water cylinder.

Key features of Glow-worm boilers

While each Glow-worm boiler model offers its own benefits, there are some features that are found across their product range.

Energy efficiency and savings

All Glow-worm combi, system and regular boilers are A rated for ErP efficiency. This is the highest level of efficiency a boiler can be given, as it means for every £1 spent on fuel for your boiler, less than 10p is wasted.

Warranty

With 10- year warranties available on the Glow-worm boiler range you can enjoy peace of mind that you are purchasing a reliable, high-quality heating system that will heat your home effectively while keeping bills as low as possible.

Glow-worm boiler installation

If you choose to buy a Glow-worm boiler for your home, you will need to find a Gas Safe engineer to install it, but how much will they charge to fit the boiler?

Installation costs for a Glow-worm boiler

The cost of installing a Glow-worm boiler could cost between £500 and £1,500 (on average). However, this is just an estimate, as the cost will be influenced by how complicated the installation is.

Finding the right installer

Before hiring an installer, remember to check that they are Gas Safe registered, and you should always ask to see their Gas Safe ID. Only a Gas Safe heating professional is legally allowed to install, maintain, and repair gas appliances. Hiring someone who is unqualified installer can be both illegal and dangerous.

Comparing quotes and installation costs

To ensure you’re getting a reasonable price for your Glow-worm boiler installation, it’s important to compare multiple quotes from Gas Safe engineers. This will give you the chance to ensure you are being charged a fair price, and you can also ask for testimonials from their previous customers.

Glow-worm boiler warranties

New boiler installations are a significant expense, and not one that you would want to repeat in a hurry. It’s important to make sure you are choosing a boiler you will be able to rely on for years to come. A good indicator of a boiler manufacturer’s confidence in their product’s durability is the warranty on offer.

Warranty coverage and duration

Glow-worm boilers include a 5 or 7-year warranty as standard, but it will only be valid if you register your new boiler with Glow-worm’s Club Energy and ensure it is serviced annually.

It’s important to get the boiler serviced by a professional heating engineer on an annual basis keep it running safely and efficiently for as long as possible. Servicing also prevents wear and tear that can lead to costly breakdowns, keeps heating bills to a minimum and catch small faults before they become a safety hazard.

How to extend your boiler warranty

Glow-worm boilers can be protected by an extended warranty of up to 10 years when the installation is carried out by a Glow-worm’s Club Energy installer. In some cases, the installation also needs to include a Glow-worm Power Filter to activate the lengthier warranty.

Glow-worm boiler reviews & customer feedback

Customer satisfaction and reliability

Glow-worm boilers are widely praised for their reliability, energy efficiency, and knowledgeable engineers. Customers highlight quick and hassle-free installations, fast response times for repairs, and user-friendly controls, including app connectivity for remote operation.

Common pros and cons from real users

Many homeowners appreciate the consistent heating and hot water, with some noting reduced energy costs compared to previous boilers. Glow-worm’s engineers are commended for their professionalism and ability to resolve issues quickly. Customers also value the company’s strong warranties, often up to 10 years, providing peace of mind.

However, some Glow-worm customers report issues with reliability, poor customer service, and repair delays. Common problems include frequent breakdowns, long wait times for repairs, missed engineer visits, and difficulties with warranty claims. Customers also complain about noisy operation, poor build quality, and engineers failing to diagnose issues correctly.

Decision making tips for potential buyers

Key considerations before buying a Glow-worm boiler

Before installing a Glow-worm boiler in your home, remember to seek the advice of at least 3 Gas Safe heating engineers. By comparing multiple quotes, you can ensure you find the right boiler for your home and lifestyle at a fair price.

Comparing Glow-worm with other brands

Here we compare the leading Glow-worm combi boiler with comparable models from the other leading boiler brands.

Brand	Average price excluding installation	ErP efficiency rating	Warranty
Worcester Bosch Greenstar 4000	£1,200	A – 94%	Up to 10 years
Vaillant EcoTec Plus 832	£1,400	A – 89.4%	Up to 10 years
Alpha E-Tec NX Plus	£800	A	Up to 13 years
Viessmann Vitodens 100-W	£1,500	A – 94%	7-year parts & labour warranty
Baxi 600	£950	A	7-year parts & labour warranty
Glow-worm Energy	£1,100	A	Up to 10 years

The key point of difference when comparing Glow-worm boilers to other brands is that they offer the same high-efficiency and long warranties as the leading brands, but they usually cost less to install.

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