If you’re a UK homeowner or landlord delving into Glow-Worm boiler reviews to find an affordable yet dependable heating upgrade, this detailed guide explores key aspects like model ranges, efficiency ratings, and user experiences to support your decision-making.
Glow-Worm Boiler Reviews: At a Glance
Glow-Worm boilers are known for cost-effective reliability for everyday UK home heating needs. Below is a concise table outlining essential details to quickly evaluate Glow-Worm’s offerings.
| Aspect | Details |
| Founded | 1934 |
| Location | Belper, Derbyshire, UK (part of Vaillant Group) |
| Awards | HVR recognition for Energy range energy efficiency, Energy Saving Trust praise for low-emission contributions, Which? Best Buy Award (2018) |
| Efficiency | Up to 94% (ErP A-rated), utilising condensing technology for reduced fuel consumption |
| Types of Boilers | Combi, system, regular (conventional/heat only) |
| Estimated Prices (Supply Only) | £550–£900 for combi; £730–£900 for system; £750–£900 for conventional |
| Warranty | Standard 2–7 years, extendable up to 10 years with approved installer and filter |
| Pros | Budget-friendly pricing, compact and installer-friendly designs, solid energy efficiency, quiet operation |
| Cons | Mixed reliability reports with occasional leaks, mid-range build quality compared to premiums, potential for higher fault rates in older models |
| Maintenance and Servicing | Annual servicing required for guarantee validity; easy access parts, nationwide engineer network via Vaillant Group |
| Ratings | 4.4/5 on Trustpilot (7,227 reviews); Which? 3-star customer score with 80% owner satisfaction |
Who Are Glow-Worm: A Brief Background
Glow-Worm has been a staple in UK home heating since its founding in 1934 in Belper, Derbyshire, initially focusing on innovative gas appliances. The brand gained prominence with reliable, affordable boilers and joined the Vaillant Group in 2001, enhancing its engineering with German precision while maintaining UK-based production and support for sustainable heating solutions.
Are Glow-Worm Boilers Worth It?
Glow-Worm boilers are worth considering for budget-conscious UK homeowners and landlords who prioritise value and straightforward performance over premium features. They deliver reliable heating at a lower entry cost, backed by decent efficiency and guarantees.
Pros of Glow-Worm Boilers
- Competitive pricing, making them accessible for cost-effective replacements or upgrades.
- High efficiency ratings up to 94%, helping lower energy bills and meet UK eco-standards.
- Compact designs suitable for space-limited properties like flats or smaller homes.
- Extended guarantees up to 10 years when installed by approved professionals.
- Quiet operation, often praised for minimal noise in daily use.
Cons of Glow-Worm Boilers
- Some users report occasional issues like leaks or malfunctions in certain models.
- Mid-tier build quality may not match the durability of higher-end brands.
- Mixed engineer feedback on long-term reliability compared to competitors.
Glow-Worm boilers achieve impressive efficiency through advanced condensing mechanisms that recover heat from exhaust, ensuring ErP A compliance and potential savings on gas usage for typical UK households.
Thinking about a heating refresh? Explore options with a free quote from Boilers 2 Go to find the best fit for your property.
Glow-Worm Boiler Range
The Glow-Worm boiler range provides versatile choices for various UK home setups, emphasising affordability and efficiency across combi, system, and regular models. Designed with user-friendly features, these boilers cater to everything from compact urban dwellings to larger family residences.
Glow-Worm Combi Boilers
Glow-Worm combi boilers offer on-demand hot water and heating without a separate cylinder, ideal for properties with limited space. The lineup includes the Easicom3 series (24-28kW for small to medium homes), Ultimate3 (30-35kW for higher demands), Energy (25-35kW with eco-friendly focus), Compact (space-saving 24kW entry-level), and Micracom (basic 24kW for budget needs).
Glow-Worm System Boilers
Glow-Worm system boilers integrate with a hot water cylinder for homes requiring simultaneous supply to multiple outlets. Key ranges feature the Energy System (25kW for efficient performance), Ultimate3 System (25-30kW for robust output), and Easicom3 System (versatile 18-24kW options suited to medium-sized properties).
Glow-Worm Regular (Conventional) Boilers
Glow-Worm regular boilers, or heat-only units, complement traditional systems with existing tanks, common in older UK homes. Offerings include the Energy Regular (12-30kW for flexible heating), Ultimate3 Regular (25kW durable models), and Compact Regular (compact 12-18kW for vented setups).
Glow-Worm Boiler Most Popular Models
Glow-Worm’s most popular models are favoured for their blend of affordability, efficiency, and ease of installation, appealing to UK installers and property owners alike. The following table showcases standout options based on market preferences and reviews.
| Model | Type | Output (kW) | Key Features | Typical Use |
| Energy 25C | Combi | 25 | A-rated efficiency, quiet operation, 7-year guarantee | Small to medium homes with 1-2 bathrooms |
| Ultimate3 30C | Combi | 30 | High flow rates, app compatibility, up to 10-year guarantee | Family properties with moderate hot water needs |
| Easicom3 24C | Combi | 24 | Compact design, easy controls, 3-year standard guarantee | Flats or starter homes |
| Energy 25S | System | 25 | Cylinder-compatible, energy-saving pump, ErP A | Larger homes with multiple taps |
| Ultimate3 25R | Regular | 25 | Reliable for traditional systems, durable heat exchanger | Older properties with existing storage |
Glow-Worm Boiler Costs
Glow-Worm boiler costs provide excellent value for UK budgets, with supply-only prices reflecting their mid-range positioning. Remember to budget for installation (£1,000–£2,000) and extras like flues or filters for a complete setup around £1,750–£3,000.
| Boiler Type | Model/Range | Output (kW) | Estimated Supply Cost (£) |
| Combi | Easicom3 Series | 24-28 | 550–620 |
| Combi | Energy Series | 25-35 | 550–900 |
| Combi | Ultimate3 Series | 30-35 | 705–775 |
| System | Energy System | 25 | 790 |
| System | Ultimate3 System | 25-30 | 730–900 |
| Conventional | Energy Regular | 12-30 | 900 |
| Conventional | Ultimate3 Regular | 25 | 750 |
Glow-Worm Boilers: Accolades and Achievements
Glow-Worm boilers boast notable accolades and achievements, underscoring their focus on efficient, user-centric heating in the UK. The brand has secured HVR recognition for the Energy range’s energy efficiency and installer-friendly innovations, alongside praise from the Energy Saving Trust for low-emission designs.
In Which? assessments, Glow-Worm earns a dependable mid-range status with an 80% owner satisfaction rate and a 3-star customer score as of 2025.
What Do Customers Say? Glow-Worm Boiler Trustpilot Reviews
Glow-Worm boiler Trustpilot reviews reflect real UK user experiences, highlighting strengths in heating reliability. With a 4.4/5 rating from 7,227 reviews, many commend efficient performance, quiet running, and value for money, though some mention mixed quality with occasional malfunctions or leaks.
Overall, the consensus positions Glow-Worm as a solid mid-range choice for dependable home warmth.
Glow-Worm Boiler Guarantee: What You Can Expect
A Glow-Worm boiler guarantee ensures protection against manufacturing defects. Standard periods range from 2–7 years (e.g., 7 years for Energy, 5 for Ultimate, 3 for Easicom), extendable to 10 years via a myREWARDS installer, filter, and registration within 30 days, plus annual servicing.
Are Glow-Worm Boilers Right for You?
Glow-Worm boilers are right for you if affordability and reliability are key in your UK property’s heating system.
Choose Glow-Worm boilers if… you’re on a budget seeking ErP A efficiency (up to 94%) for lower bills, need compact units for smaller spaces, or value extendable guarantees up to 10 years in homes with standard demands.
Don’t choose Glow-Worm boilers if… you prefer premium durability with fewer reported issues, require ultra-high outputs for very large properties, or prioritise top-tier Which? scores over cost savings.
Looking for a New Boiler Quote?
Looking for a new boiler quote? Boilers 2 Go delivers expert consultations and affordable solutions for UK homeowners and landlords—secure your customised quote now to optimise your home’s heating and efficiency.
FAQs
How do Glow-Worm’s app controls influence operational costs?
Glow-Worm’s app-compatible models allow remote adjustments, potentially cutting unnecessary heating by 10-15% through precise scheduling, benefiting UK users with variable routines.
What underrated advantages do Glow-Worm boilers offer landlords?
Glow-Worm boilers aid landlords in achieving better EPC ratings cost-effectively, with straightforward diagnostics reducing downtime and compliance hassles in rental properties.
Are there subtle drawbacks of Glow-Worm boilers in new-builds?
In modern UK new-builds with advanced insulation, Glow-Worm’s mid-range modulation might lead to slight over-cycling, marginally increasing wear compared to adaptive premiums.
How do Glow-Worm prices factor into grant eligibility?
Glow-Worm’s accessible pricing often aligns with UK schemes like ECO4, enabling grants up to £1,500 for qualifying households, enhancing affordability for efficiency upgrades.
What specialised achievements has Glow-Worm gained for innovation?
Glow-Worm’s accolades include installer-focused honours for easy-fit designs, appealing to UK professionals seeking time-saving features without sacrificing performance.
I’m Penny North, a home energy heating expert. My mission is to demystify new boilers and complex heating systems to help you achieve a warm, cosy home with lower energy bills and a smaller environmental footprint.