Glow-Worm cost between £550 and £1789, excluding the cost of installation.
Glow-worm is amongst the leading boiler manufacturers in the UK and its boilers are highly energy efficient resulting in reduced carbon emissions and heating costs. With a strong British heritage spanning 75 years, Glow-worm also invests in renewable technologies, hot water cylinders and domestic controls. Glow-worm also received the ‘Best Buy’ award from the highly prestigious Which? consumer organisation, which demonstrates the brand’s commitment to quality, performance and value for money.
Glow-Worm Combi Boilers Range – Compact, Neat & Value For Money
Combi boilers are by far the most common type of boilers in the UK. A whopping 70% of homeowners lean towards a combination boiler over other options. It makes sense. They’re highly compact, easy to install and deliver on-demand hot water and heating from a single unit (i.e. no additional water cylinders necessary).
Combination boilers, to give them their full title, work by taking cold water straight from the mains supply and heating it as required. This removes the need for separate water storage tanks, but can take a short while for the water to warm. Glow Worm deliver warm water in as little as five seconds which is very impressive.
Glow Worm combi boilers also boast a +90 ErP efficiency rating which is ideally what you should be looking for in boilers to deliver a reliable heating performance.
All new Glow Worm boilers have extensive flue options which give qualified gas-safe installers more flexibility when fitting. Glow Worm combi boiler prices range from £550 to £1,555 determined by the size, Kw output and flow rate.
We’ve put together a simple table that enables you to compare each Glow Worm combi boiler series. Please note the prices listed below do not include installation costs:
| Combi Gas Boiler Series | Sizes | Size Of Home | Price |
|---|---|---|---|
| Glow-worm Betacom4 Combi | 24 – 30kW | Small to medium-sized homes with one bathroom | £550 – £612 |
| Glow-worm Essential Combi | 24 – 28kW | Small to medium-sized homes with one bathroom | £620 – £660 |
| Glow-worm Easicom Combi | 24 – 28kW | Small to medium-sized homes with one bathroom | £627 – £660 |
| Glow-worm Betacom2 Combi | 24 – 28kW | Small to medium-sized homes with one bathroom | £642.41 – £680.06 |
| Glow-worm Flexicom Combi | 24 – 35kW | Small, medium and large-sized homes | £650 – £880 |
| Glow-worm Ultimate3 Combi | 30 – 35kW | Medium to large-sized homes with one bathroom | £695 – £770 |
| Glow-worm Ultracom2 Combi | 24 – 35kW | Small, medium and large-sized homes | £738 – £975 |
| Glow-worm Energy Combi | 25 – 35kW | Small, medium and large-sized homes | £790 – £920 |
| Glow-worm Energy 35 Store Combi | 35kW | Large homes with more than one bathroom | £1,555 |
Glow-Worm Regular Heat Only Boilers Range – Traditional & Practical
Regular heat-only boilers (often referred to as conventional or open-vented boilers) tend to be used in traditional central heating systems and are ideal replacements if this type of system is already installed in your home.
Working based on ‘heating only’, a heat-only boiler requires additional storage tanks for hot and cold water. This makes them more reliable to deliver hot water than combi boilers, which have a limited amount of stored hot water and you usually have to wait five minutes or so for another load to be prepared.
Heat-only boilers, on the other hand, store pre-heated hot water in a built-in cylinder which is fed by a cold water tank. This gives you a consistent and reliable flow of hot water so you can use multiple taps at the same time without the risk of stealing hot water from the family member in the shower whilst you fill the kettle.
A few pointers to consider here: heat-only boilers are slightly more expensive than combi boilers with prices starting from £623 to £1,004. You also need space to fit two water cylinders, the sizes of which vary depending on the size boiler you need. Water cylinders are typically stored in the loft — so not much use for apartments in a high-rise.
Suitable for a variety of lifestyles and properties, the Glow Worm regular heat-only boiler range includes the following options. Please note the prices listed below do not include installation costs:
| Heat Only Gas Boiler Series | Sizes | Size Of Home | Pice |
|---|---|---|---|
| Glow-worm Flexicom hx Regular | 24 – 35kW | Small, medium and large-sized homes with more than one bathroom | £622.80 – £1,003.64 |
| Glow-worm Energy Regular | 12 – 30kW | Small, medium and large-sized homes with more than one bathroom | £780 – £900 |
| Glow-worm Ultimate3 Regular | 25kW | Small and medium-sized homes with more than one bathroom | £830 |
| Glow-worm Easicom3 Regular | 25kW | Small and medium-sized homes with more than one bathroom | £890 |
Glow-Worm System Boiler Range – Reliable, Neat & Quick To Install
System boilers are similar to regular heat only boilers in the sense that they require an additional hot water storage tank. The key difference is they feed directly into the mains water supply and are completely sealed. A “sealed” system means that water is consistently fed into the pipes from the water mains via a filling loop which connects the boiler’s pipework to the mains water pipework.
All the components of Glow-worm system boilers, system boilers are pre-wired, pre-plumbed and pre-tested for easier instalment and greater reliability. Glow-worm system boilers are highly efficient and come in a range of sizes with varying flow rates and outputs. Prices range from £625 to £1,789.
Designed with most property sizes in mind, the Glow Worm system boiler range includes. Please note the prices listed below do not include installation costs:
Designed with most property sizes in mind, the Glow-worm system boiler range includes:
| System Gas Boiler Series | Sizes | Size Of Home | Price |
|---|---|---|---|
| Glow-worm Easicom3 System | 25kW | Small and medium-sized homes with multiple bathrooms | £625 |
| Glow-worm Energy System | 12 – 30kW | Small, medium and large-sized homes with multiple bathrooms | £710 – £840 |
| Glow-worm Ultracom2 sxi System | 12 – 30kW | Small, medium and large-sized homes with multiple bathrooms | £716.84 – £857.24 |
| Glow-worm Flexicom System | 18 – 30kW | Small, medium and large-sized homes with multiple bathrooms | £615.60 – £703.20 |
| Glow-worm Ultimate3 System | 25kW | Small and medium-sized homes with multiple bathrooms | £810 |
| Ultrapower sxi Store System | 10 – 17kW | Small and medium-sized homes with multiple bathrooms | £1,635.41 – £1,788.78 |
Why Choose Glow-Worm?
Glow Worm has been installing user-friendly boilers for UK homeowners since 1934. With such an impressive heritage, it’s safe to say this is a brand that knows a thing or three about boilers. And given the manufacturing plant is based in Derbyshire, you can be assured that British manufacturing standards are on point. The company has also invested heavily in renewable energies and most of their boilers are fitted with all the mod cons such as hot water cylinders, user-friendly LCD and domestic controls.
Glow Worm is so well regarded in the renewable energy space that the company was acquired by the Vaillant Group in 2001 — and they are the second-largest heating company in Europe. You could say they were concerned about leaving Glow Worm as a competitor.
Glow Worm also offer three, five or seven-year out-the-box guarantees and 10 years on some of the top range models.
But what do customer and engineer reviews say? To help you choose the most reliable brand of boiler, we’re going to take a look at what the nation has said about Glow-worm.
Great Customer Reviews
Nearly 7000 customer reviews can be found on Trustpilot, one of the world’s most popular review platforms. Glow-worm has achieved 4.6 out of 5 stars overall, with 74% of reviewers rating the brand and its boilers as excellent. This is a pretty good score and should leave you feeling confident about the quality and reliability of Glow-worm boilers. Negative feedback is very low, with only 4% of people leaving a bad or average review and just 2% rating their experience as poor. Having taken a closer look at the feedback from verified orders, it seems as though most people are more than satisfied with their products and the brand’s level of service.
Average Which? Score
Glow Worm’s Which? gas boiler scores have also increased in the last three years, receiving a 74% customer satisfaction rating, up from 54% in 2018.
As you can see from the table below, Glow Worm warranted four out of five stars from both customers and engineers but hit the heady heights of a maximum of 5 out of 5 for reliability.
Reliability is based on breakdowns within the 7-year warranty period, customer score takes into account how likely people are to recommend Glow Worm boilers to others, and engineer scores are determined by a series of repair and replacement factors.
Yes, there is a cost saving buying a Glow Worm vs. buying an Ideal boiler but only maybe a 10% cost saving. But Ideal do have a 7-year warranty [& an extra 5 years more on their heat exchangers] vs Glow Worms’ pretty basic 5-year warranty.
Below, you can find the brand data results for Glow-worm boilers, which we sourced from the Which? website.
Glow Worm Overall Score
Based on responses from a May 2023 survey of 11,571 Which? members about their boilers.
Glow-worm Boiler Problems and Repairs
There’s never a good time to learn that your boiler is having issues and it’s likely that your Glow-worm boiler will develop a problem and need repairs from time to time. Some faults are more common than others and different action is required depending on the boiler model you own. You might be able to fix simple problems, like thawing a frozen condensate pipe, but the majority of Glow-worm boiler troubles will need to be fixed by a qualified Gas Safe registered engineer. If you would like to learn more about the most common boiler faults and what you need to do when something goes wrong with your Glow-worm boiler, you can read our guide to Common Glow-worm Problems and Repairs.
Glow-worm Boiler Fault Codes
When a Glow-worm boiler develops a fault, it might show a fault code to inform you that there is a problem with your boiler. The fault codes help to make it easier for your engineer to find and resolve all types of boiler problems, so it’s always a good idea to make a note of any fault codes that appear as this will help your engineer to get to the bottom of the issue quickly and efficiently. Your boiler manual usually contains all of the fault codes that relate to your boiler or you might be able to find a list of codes on Glow-worm’s website. Alternatively, you can check out our guide to Glow-worm Boiler Fault Codes to help you diagnose any problems and find solutions.
Glow Worm Boiler Cover
Glow Worm boilers are a great investment but to get the best results you will need to arrange boiler cover. Glow Worm’s Care and Repair plan is offered in conjunction with Domestic and General, providing you with support whenever you need it. You can look forward to repairs up to £1500, a replacement up to £750 when needed and the option to upgrade to include your heating too. If you are keen to learn more about Glow Worm boiler cover then head over to boiler cover information here
Glow-worm Boiler Warranty
If you purchase a Glow-worm boiler, you’ll get a manufacturer-backed boiler warranty that covers the costs of parts and labour should your boiler need repairs during the warranty period. The length of your Glow-worm boiler warranty will depend on which boiler model you choose and whether you get a Club Energy Installer to install your new boiler. But to qualify for the standard warranty, you’ll need to register the warranty and comply with strict terms and conditions, all of which can be found on Glow-worm’s website. It’s also worth taking a look at our Glow-worm Boiler Warranty guide as it explains what is covered by the warranty, some of the terms and conditions and how you can register your warranty.
Glow-worm Boiler Controls
Boiler controls can make your life easier and your boiler more efficient, which is why we recommend you explore Glow-worm’s range of optional boiler controls. The selection of Glow-worm boiler controls on offer includes simple room thermostats and wireless outdoor sensors, along with clever personal heating assistants that let you control and customise your heating and hot water from a smartphone or tablet. As correct use of optional boiler controls can help you minimise energy consumption, improve indoor comfort levels and save more money on your energy bills, it’s important to learn about all of the options available. Our Glow-worm Boiler Controls guide looks at the different types of controls you can purchase, how they work and what they can do for you and your home
| Model | Type | Dimensions | Maximum Flow Rate | Output | Efficiency Rating | Typical Price |
|---|---|---|---|---|---|---|
| Betacom4 Combi-24 | Combi | H - 740 mm W - 418 mm D - 300 mm | 10 l/min | 24 kW | A | £550 |
| Betacom4 Combi 30 | Combi | H - 740 mm W - 418 mm D - 300 mm | 12.4 l/min | 30 kW | A | £612 |
| Flexicom 18sx | System | H - 700 mm W - 390 mm D - 280 mm | N/A | 18 kW | A | £615.6 |
| Essential Combi 24 | Combi | H - 740 mm W - 418 mm D - 300 mm | 10 l/min | 24 kW | A | £620 |
| Flexicom 24hx | Heat Only | H - 600 mm W - 375 mm D - 280 mm | N/A | 24 kW | A | £622.8 |
| Easicom 24 | Combi | H - 740 mm W - 480 mm D - 338 mm | 9.8 l/min | 24 kW | B | £624 |
| Easicom3 System 25 | System | H - 740 mm W - 418 mm D - 300 mm | N/A | 25 kW | A | £625 |
| Betacom2 24 | Combi | H - 900 mm W - 500 mm D - 390 mm | 9.8 l/min | 24 kW | A | £642.41 |
| Ultracom 12hxi | Heat Only | H - 600 mm W - 375 mm D - 280 mm | N/A | 12 kW | A | £649.1 |
| Flexicom 24cx | Combi | H - 700 mm W - 390 mm D - 280 mm | 9.85 l/min | 24 kW | A | £650 |
| Easicom 28 | Combi | H - 740 mm W - 480 mm D - 338 mm | 11.5 l/min | 28 kW | B | £660 |
| Essential Combi 28 | Combi | H - 740 mm W - 418 mm D - 300 mm | 11.7 l/min | 28 kW | A | £660 |
| Betacom2 28 | Combi | H - 900 mm W - 500 mm D - 390 mm | 11.2 l/min | 28 kW | A | £680.06 |
| Ultracom 15hxi | Heat Only | H - 600 mm W - 375 mm D - 280 mm | N/A | 15 kW | A | £687.48 |
| Ultimate3 Combi 30 | Regular | H - 740 mm W - 418 mm D - 300 mm | 12.4 l/min | 30 kW | A | £695 |
| Flexicom 30cx | Combi | H - 700 mm W - 390 mm D - 280 mm | 12.3 l/min | 30 kW | A | £696 |
| Flexicom 30sx | System | H - 700 mm W - 390 mm D - 280 mm | N/A | 30 kW | A | £703.2 |
| Energy System 12 | System | H - 700 mm W - 390 mm D - 280 mm | N/A | 12 kW | A | £710 |
| Ultracom 18hxi | Heat Only | H - 600 mm W - 375 mm D - 280 mm | N/A | 18 kW | A | £716.78 |
| Ultracom2 12sxi | System | H - 726 mm W - 450 mm D - 334 mm | N/A | 12 kW | A | £716.84 |
| Flexicom 30hx | Heat Only | H - 600 mm W - 375 mm D - 280 mm | N/A | 30 kW | A | £719.84 |
| Ultracom2 24cxi | Combi | H - 726 mm W - 418 mm D - 346 mm | 10.4 l/min | 24 kW | A | £738 |
| Energy System 15 | System | H - 700 mm W - 390 mm D - 280 mm | N/A | 15 kW | A | £740 |
| Ultracom 24hxi | Heat Only | H - 600 mm W - 375 mm D - 280 mm | N/A | 24 kW | A | £745.82 |
| Ultimate 30c | Combi | H - 740 mm W - 418 mm D - 338 mm | 12.5 l/min | 30 kW | B | £750 |
| Energy System 18 | System | H - 700 mm W - 390 mm D - 280 mm | N/A | 18 kW | A | £770 |
| Ultimate3 Combi 35 | Regular | H - 740 mm W - 418 mm D - 300 mm | 14.4 l/min | 35 kW | A | £770 |
| Energy Regular 12 | Regular | H - 600 mm W - 375 mm D - 280 mm | N/A | 12 kW | A | £780 |
| Ultracom2 18sxi | System | H - 726 mm W - 450 mm D - 334 mm | N/A | 18 kW | A | £788.84 |
| Energy Combi 25 | Combi | H - 700 mm W - 390 mm D - 280 mm | 12.1 l/min | 25 kW | A | £790 |
| Ultracom 30hxi | Heat Only | H - 600 mm W - 375 mm D - 280 mm | N/A | 30 kW | A | £795.36 |
| Ultimate 35c | Combi | H - 740 mm W - 418 mm D - 338 mm | 14.6 l/min | 35 kW | B | £800 |
| Energy Regular 15 | Regular | H - 600 mm W - 375 mm D - 280 mm | N/A | 15 kW | A | £810 |
| Energy System 25 | System | H - 700 mm W - 390 mm D - 280 mm | N/A | 25 kW | A | £810 |
| Ultimate3 System 25 | System | H - 740 mm W - 418 mm D - 300 mm | N/A | 25 kW | A | £810 |
| Ultimate3 Regular 25 | Regular | H - 600 mm W - 375 mm D - 280 mm | N/A | 25 kW | A | £830 |
| Energy Regular 18 | Regular | H - 600 mm W - 375 mm D - 280 mm | N/A | 18 kW | A | £840 |
| Energy System 30 | System | H - 700 mm W - 390 mm D - 280 mm | N/A | 30 kW | A | £840 |
| Energy Combi 30 | Combi | H - 700 mm W - 390 mm D - 280 mm | 14.2 l/min | 30 kW | A | £850 |
| Ultracom2 30sxi | System | H - 726 mm W - 450 mm D - 334 mm | N/A | 30 kW | A | £857.24 |
| Energy Regular 25 | Regular | H - 600 mm W - 375 mm D - 280 mm | N/A | 25 kW | A | £870 |
| Ultracom2 30cxi | Combi | H - 726 mm W - 418 mm D - 346 mm | 12.5 l/min | 30 kW | A | £874.7 |
| Flexicom 35cx | Combi | H - 700 mm W - 390 mm D - 280 mm | 14.4 l/min | 35 kW | A | £880 |
| Easicom3 Regular 25 | Regular | H - 600 mm W - 375 mm D - 280 mm | N/A | 25 kW | A | £890 |
| Energy Regular 30 | Regular | H - 600 mm W - 375 mm D - 280 mm | N/A | 30 kW | A | £900 |
| Energy Combi 35 | Combi | H - 700 mm W - 390 mm D - 280 mm | 16.5 l/min | 35 kW | A | £920 |
| Ultracom2 35cxi | Combi | H - 726 mm W - 418 mm D - 346 mm | 14.6 l/min | 35 kW | A | £975 |
| Flexicom 35hx | Heat Only | H - 600 mm W - 375 mm D - 280 mm | N/A | 35 kW | A | £1003.64 |
| Ultracom 38hxi | Heat Only | H - 600 mm W - 375 mm D - 280 mm | N/A | 38 kW | A | £1213.06 |
| Ultracom2 35 store | Combi | H - 890 mm W - 470 mm D - 561 mm | 19.1 l/min | 35 kW | A | £1309.2 |
| Energy 35 Store Combi 35 | Combi | H - 890 mm W - 470 mm D - 561 mm | 19.7 l/min | 35 kW | A | £1555 |
| Ultrapower 100sxi Store | System | H - 1260 mm W - 575 mm D - 600 mm | 12.5 l/min | 10 kW | A | £1635.41 |
| Ultrapower 170sxi Store | System | H - 1520 mm W - 575 mm D - 600 mm | 12.5 l/min | 17 kW | A | £1788.78 |
Glow Worm Boiler Comparison: Which other boilers stack up?
Glow Worm is one of the top performers in the UK boiler market. Glow Worm boilers are comparable to Ideal, Baxi and Viessmann for reliability and ratings, and boast a similar price point to Baxi and Ideal. All 3 brands are significantly less expensive
Compare Glow Worm Boiler Quotes
As for getting the best competitive boiler installation price and service, you will need to shop around. We recommend getting a quote from a national installer and a local boiler installer. Compare them on the cost of the boiler and the cost of installation. Average installation costs are between £1,500 – £1,800. Comparing Glow Worm gas boilers prices could save you hundreds of pounds.
Other factors to consider include the flexibility of when your installer can install your new boiler and their safety record. Today all boiler installations are done by Gas Safe Registered engineers. This ensures it’s done safely and legally.
Get a Free Baxi Boiler QuoteSources Used