Choosing a new boiler is a crucial decision for any homeowner. It's an investment in your home's comfort and efficiency for years to come. Glow Worm has emerged as a strong contender in the UK market, offering a compelling balance of performance and value.
We provide a comprehensive review of the Glow Worm boiler, drawing on expert opinions and customer feedback. By examining key features, pricing, efficiency, and after-sales support, you'll gain the clarity needed to decide if a Glow Worm boiler is the right fit for your home and budget.
- Content Guide
- » What is a Glow Worm Boiler?
- » Types of Glow Worm Boilers
- - Glow Worm Combi Boilers
- - Glow Worm System Boilers
- - Glow Worm Regular Boilers
- » Popular Glow Worm Combi Boiler Reviews
- - Glow Worm 24kW Combi Boiler Reviews
- - Glow Worm Energy 30kW Combi Boiler Review
- - Glow Worm 35kW Combi Boiler Reviews
- » Key Features and Technology
- » Boiler Installation and Fitting
- » Pricing and Value for Money
- » Boiler Warranty and After-Sales Service
- » Upgrade Your Home Heating Today
- » Frequently Asked Questions
What is a Glow Worm Boiler?
Glow Worm is a well-established Derbyshire-based boiler manufacturer with a strong presence in the UK heating market. As a part of the esteemed Vaillant Group, Glow Worm benefits from the engineering prowess of a larger, high-quality heating products company while maintaining its focus on affordability and efficiency.
Their reputation comes from producing dependable heating systems designed to suit the needs of many UK households.
Customer reviews frequently highlight the intuitive controls and straightforward operation of their boilers, making them a user-friendly option. With the backing of experienced engineers and positive feedback on their after-sales support, Glow Worm has solidified its position as a trustworthy and competitive choice. Our certified engineers can carry out a professional boiler installation as early as the next day.
Types of Glow Worm Boilers
Glow Worm offers a diverse product range to meet various household requirements, focusing on three primary boiler types: combi, system, and regular (heat-only) boilers. Each is designed with energy efficiency and reliability at its core.
Glow Worm Combi Boilers
Combi boilers are a great choice for their compact, all-in-one design.
They provide both central heating and instant hot water from a single unit, eliminating the need for a separate hot water cylinder. This makes them ideal for smaller homes where space is at a premium.
Glow Worm System Boilers
System boilers are suited for homes with higher hot water demands, as they work with a separate cylinder to store hot water. Key components like the pump are built into the boiler, which simplifies the installation process. Glow Worm offers system boilers in various capacities to cater to different property sizes, all boasting high ErP ratings to help reduce energy consumption.
Glow Worm Regular Boilers
Also known as heat-only or conventional boilers, they are typically found in older properties with traditional heating systems. They operate with a separate hot water cylinder and a cold water storage tank, making them suitable for properties that already have this style of system in place.
Popular Glow Worm Combi Boiler Reviews
Let's look at some of the most popular Glow Worm combi boilers to see how they stack up.
Glow Worm 24kW Combi Boiler Reviews
A 24kW combi boiler is an excellent choice for smaller homes, apartments, or flats with one bathroom. It provides sufficient heating and hot water for properties with up to 10 radiators without being overpowered. Users appreciate the compact size of Glow Worm's 24kW models, which often allows for installation within a standard kitchen cupboard. Reviews frequently praise its quiet operation and energy efficiency, leading to noticeable savings on utility bills.
Glow Worm Energy 30kW Combi Boiler Review
The 30kW models, such as the popular Glow Worm Energy 30kW combi boiler, are versatile workhorses suitable for medium-sized homes, typically with 3-4 bedrooms and one main bathroom, plus an en-suite. These boilers offer a higher hot water flow rate, ensuring strong performance even under high demand. The Glow Worm Energy range is known for its reliability and straightforward controls. Customer feedback often highlights its value for money, providing performance comparable to more premium brands at a more accessible price point.
Glow Worm 35kW Combi Boiler Reviews
For larger properties with higher heating and hot water demands, such as homes with more than four bedrooms or multiple bathrooms, a 35kW combi boiler is a powerful solution. The Glow Worm 35kW models deliver excellent flow rates and a robust heating output to keep larger homes comfortable.
Homeowners with big families often praise the consistent hot water supply, even when multiple taps are in use simultaneously. While more powerful, these boilers still maintain high efficiency, ensuring running costs remain manageable.
Have a look at our blog “Glow-worm Energy 30c Review” for more insight.
Key Features and Technology
The 2025 Glow Worm boiler range integrates advanced technology to improve efficiency and user experience.
| Boiler Feature | Details |
|---|---|
| Energy Efficiency | Glow Worm boilers are designed to meet the high standards of the ErP (Energy-related Products Directive). A key component is the high-efficiency Grundfos pump, which adapts to the heating system's demands to optimise energy use. This saves a significant amount on energy bills. |
| Heat Exchanger | The heat exchanger is important for transferring heat to your water. Glow Worm utilises a robust, automotive-grade aluminium heat exchanger designed for long-lasting performance and excellent heat transfer. |
| Controls and Accessories | Modern controls make managing your heating simple. Glow Worm offers smart thermostats, like the MiGo, which allow you to control your heating remotely from a smartphone app. This provides greater convenience and helps further reduce energy consumption. |
Boiler Installation and Fitting
A professional installation is critical to ensure your new boiler operates safely and efficiently.
The cost and process can vary depending on the complexity of the job.
- Combi-to-Combi Swap: A straightforward replacement of an old combi boiler with a new one is the simplest installation, typically costing around £1,595.
- System-to-Combi Conversion: Converting from a system boiler to a combi is more involved as it requires removing the old cylinder and adjusting pipework. This usually costs about £2,390.
- New Installation: Installing a boiler in a property with no existing system is the most complex, with costs ranging from around £2,795.
It is essential to use a Gas Safe-registered engineer for any boiler installation. We recommend getting quotes from multiple certified installers to make sure you receive competitive pricing and quality service. Be sure to read our blog “Things to Consider Before a Boiler Installation” for helpful guidance.
Pricing and Value for Money
Glow Worm is well-regarded for offering excellent value. Boiler-only prices for their combi range typically fall between £550 and £1,555, depending on the model's output and features.
While not the cheapest brand on the market, Glow Worm's pricing is highly competitive, often undercutting premium brands like Worcester Bosch while delivering reliable performance. This makes them an attractive option for homeowners seeking a balance between cost and quality.
Boiler Warranty and After-Sales Service
Glow Worm provides a reassuring warranty on its products.
Many boilers come with a 7-year warranty as standard, which can often be extended when installed by a professional. This warranty covers the repair or replacement of faulty boiler components, offering valuable peace of mind.
Their after-sales support is handled by a dedicated customer service team.
Common Issues and Maintenance
While Glow Worm boilers are reliable, some common issues can arise, such as loss of pressure or thermostat problems. Most of these can be prevented with annual servicing. If something goes wrong, the boiler will show an error code to help identify what the issue might be.
A simple boiler reset can sometimes resolve the issue, but persistent faults require attention from a Gas Safe engineer.
Upgrade Your Home Heating Today
Glow Worm boilers offer a fantastic blend of efficiency, reliability, and value, making them a solid choice for many UK homeowners. From compact combi models perfect for flats to powerful systems for large family homes, there is likely a Glow Worm boiler that fits your needs.
If you're ready to upgrade your heating system, getting a professional quote is the next step. At Serviceteam, we can provide a fixed-price quote in just 60 seconds.
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If you’re planning to upgrade your boiler, take a look at our Boiler Review blog section. You’ll find helpful insights to guide you toward the best choice for your needs.
Frequently Asked Questions
Are Glow-worm boilers any good as a combi boiler?Glow-worm combi boilers are reliable, efficient, and easy to use. The 24kW and 28kW models offer 92–93% ErP efficiency, and each Compact unit includes a 5-year warranty for added peace of mind.
Which is better, Worcester Bosch or Glow-worm?Worcester Bosch and Glow-worm both make reliable boilers, but they suit different needs. Worcester Bosch generally delivers higher build quality, premium brass components, and efficiency levels that can reach around 98%. Glow-worm boilers, on the other hand, use more plastic parts, which keeps their price lower. They're usually £200–£300 cheaper than Worcester Bosch, making Glow-worm a good choice for homeowners looking for a budget-friendly option without compromising basic performance.
How long does a Glow-worm combi boiler last?Around 10 to 15 years, depending on how well it's maintained. With regular annual servicing and quick attention to small faults, many Glow-worm boilers can operate efficiently for even longer. Keeping up with routine care is the key to a longer, trouble-free lifespan.
What are the common problems with the Glow-worm boilers?If your Glow-worm boiler has stopped heating or isn't providing hot water, several issues could be responsible. The most common problems include a frozen condensate pipe, a failing pump, a stuck or faulty diverter valve, or an electrical fault within the system. A proper diagnosis from a qualified engineer will help identify the exact cause and get your boiler running again.
Frequently Asked Questions
Q. What are the dirty dishes in dishwasher signs?If your dishes coming out dirty from dishwasher, you'll spot food bits still clinging on, glasses looking cloudy, or a greasy film on plates. A dodgy smell when you open it up is often a dead giveaway too.
Q. How long can I keep dirty dishes in dishwasher?Ideally, you should run your dishwasher daily or every other day. Why? To stop food from drying on and attracting unwanted guests. Leaving dirty dishes too long, especially in those warm London flats, can lead to some really nasty smells and a bacterial party you definitely don't want.
Q. Why are my dishes still dirty after running the dishwasher?A few common culprits here! Maybe you've overloaded it, blocked the spray arms, didn't use enough detergent, or your filter is clogged. Plus, in London, our hard water can really mess with the cleaning process. Check these usual suspects first to get your crockery sparkling clean.
Q. Can hard water affect how clean my dishes get?Yes! London's water is pretty hard, packed with minerals like calcium and magnesium. This can leave annoying white spots, streaks, and that cloudy film on your dishes. It also makes your detergent less effective. To get those sparkling results, you really need to use a rinse aid or a descaler regularly.
Q. How often should I clean my dishwasher?Once a month. This gets rid of all that food debris, grease, and limescale buildup. And a quick wipe of the door seals every week helps a lot too! Keeping it clean ensures it smells fresh and runs efficiently- important for busy London households!
