You need a new boiler. You have ruled out the premium price tags of Worcester Bosch and Vaillant. You want solid quality without paying over the odds. Now you are staring at three names that keep coming up: Ideal, Baxi, and Glow-worm.
These are the three biggest names in the British mid-market boiler space. They dominate new-build installations, landlord properties, and sensible homeowner replacements across the UK. But which one actually deserves your money?
At Boiler Installer London, we fit hundreds of these units every year across the capital. We see how they perform after six months, two years, and five years. We know which ones come back with warranty claims, which ones our engineers prefer to service, and which ones save our customers the most headaches. This guide gives you the straight answer, with real data, real prices, and no sales pitch.
The Short Answer: Ideal vs Baxi vs Glow-worm
Choose Ideal when you want the longest warranty, the most features, and a boiler that feels premium without the premium price. The Ideal Logic Max and Vogue Max ranges are the standout options.
Choose Baxi when you want proven reliability, excellent parts availability, and a brand that tradespeople genuinely respect. The Baxi 600 and 800 ranges hit the sweet spot for most three and four-bedroom homes.
Choose Glow-worm when budget is tight and you still want a decent warranty, quiet operation, and the backing of the Vaillant Group. The Glow-worm Energy range is hard to beat on value.
Still unsure? Read on. The right choice depends on your property size, your budget, and how long you plan to stay in your home.
Why These Three Brands Dominate the UK Market
Walk into any merchant yard in London and you will see these three brands stacked floor to ceiling. There is a reason for that.
Ideal, Baxi, and Glow-worm are all British-heritage brands with manufacturing and R&D rooted in the UK. They understand British plumbing systems, British water pressure, and British weather. They price their boilers competitively because they are not importing them from Germany with inflated exchange-rate costs.
More importantly, they all offer hydrogen-ready boilers as standard. That matters in 2026. The UK government is pushing hydrogen blending into the gas grid, and these brands have future-proofed their ranges for a 20% hydrogen mix. You will not need to replace your boiler again in five years because of fuel changes.
They also sit in that crucial £1,700 to £3,200 installed-price bracket. That is the range most UK homeowners actually shop in. Worcester Bosch and Vaillant start higher and climb fast. These three brands give you 90% of the performance at 70% of the cost.
Head-to-Head Comparison Table
| Feature | Ideal | Baxi | Glow-worm |
|---|---|---|---|
| Best-known range | Logic Max / Vogue Max | 600 / 800 | Energy / Ultimate 3 |
| Typical installed price | £2,000 – £3,200 | £1,800 – £2,800 | £1,725 – £2,400 |
| Maximum warranty | 10 years (parts & labour) | 10 years (parts & labour) | 10 years (parts & labour) |
| Heat exchanger material | Aluminium (with brass filter) | Stainless steel | Aluminium |
| Hydrogen ready | Yes (20% blend) | Yes (20% blend) | Yes (20% blend) |
| Quiet Mark accredited | No | No (800 range is ultra-quiet) | Yes (Energy range) |
| Trustpilot score | ~4.5 / 5 | ~4.6 / 5 | ~3.0 / 5 (Which? Best Buy) |
| Parts availability | Excellent | Excellent | Good (Vaillant network) |
| Best for | Features & warranty | Reliability & value | Budget & quiet operation |
Ideal Boilers: The Feature-Rich Choice
Ideal Heating has transformed its reputation over the past decade. The old perception of Ideal as a budget-only brand is gone. Today, the Ideal Logic Max and Ideal Vogue Max ranges compete directly with mid-tier Worcester models.
What Ideal Does Well
The Logic Max combi starts at around £2,000 installed and comes with a 10-year warranty when fitted by an accredited installer. That warranty is not just marketing fluff. It covers parts and labour with no hidden service-plan subscriptions. You register it online within 30 days and you are covered.
The Vogue Max sits above the Logic Max and adds a stainless steel heat exchanger, a more advanced display, and a higher build quality. We fit the Vogue Max in properties where the homeowner wants premium touches without crossing the £3,000 threshold.
Ideal boilers come with a built-in brass filter and scale reducer. In London’s hard water areas, that matters. Limescale kills boilers, and that filter extends the life of the heat exchanger significantly.
Where Ideal Falls Short
The aluminium heat exchanger in the Logic Max range is a talking point among engineers. Aluminium is efficient and lightweight, but it is less forgiving than stainless steel if the system is dirty. You must have a system flush and a magnetic filter fitted. Skip this step and you risk early failure. We always pair Ideal installations with a proper powerflush and a Magnaclean or Fernox filter.
Bottom Line on Ideal
Ideal is the best boiler brand in this trio for homeowners who want maximum warranty protection, modern controls, and a boiler that looks and feels current. The 10-year parts and labour cover is genuinely market-leading at this price point.
Baxi Boilers: The Installer’s Favourite
Ask ten heating engineers which boiler they would fit in their own home, and six will say Baxi. That is not an accident. Baxi has earned its reputation through decades of solid engineering and straightforward servicing.
What Baxi Does Well
The Baxi 600 and Baxi 800 ranges are the standouts. The 600 is the workhorse: compact, reliable, and priced around £1,800 to £2,200 installed. The 800 adds more power, a stainless steel heat exchanger, and compatibility with Baxi’s smart thermostat.
Here is why engineers love Baxi: the parts are cheap, widely stocked, and the boiler is designed to be serviced quickly. The front panel comes off in seconds. The combustion seals are accessible. The fault codes are clear. When a Baxi breaks, it is usually cheap to fix. That keeps long-term ownership costs down.
The stainless steel heat exchanger in the 800 range is a major selling point. Stainless steel resists corrosion and thermal shock better than aluminium. In older systems with slightly dirty water, it is more forgiving.
Where Baxi Falls Short
Baxi does not have the same showroom appeal as Ideal. The control interface is functional rather than flashy. The warranty on the 600 range is typically 7 years unless you use an accredited installer who can push it to 10. You need to check this carefully when getting quotes.
Bottom Line on Baxi
Baxi is the best boiler for homeowners who value long-term reliability and low maintenance costs over flashy features. It is the sensible choice, and there is nothing wrong with sensible.
Glow-worm Boilers: The Quiet Budget Winner
Glow-worm is the budget arm of the Vaillant Group. That is important. You are getting Vaillant engineering and Vaillant parts availability at a lower price point. The Glow-worm Energy range is the one to watch.
What Glow-worm Does Well
The Energy combi boiler is one of the quietest boilers on the market. It carries the Quiet Mark accreditation, which is not just marketing. We have fitted these in flats where the boiler sits in a kitchen cupboard, and the homeowner barely knows it is running.
Pricing is aggressive. A Glow-worm Energy installation typically costs between £1,725 and £2,100. That makes it the cheapest boiler to install in this comparison while still offering a 10-year warranty through approved installers.
The Ultimate 3 range steps up the build quality and adds a more robust heat exchanger. It is still priced below equivalent Ideal and Baxi models.
Because Glow-worm is part of the Vaillant Group, parts are stocked through the same merchant network. You will not struggle to find a Gas Safe engineer who can service or repair it.
Where Glow-worm Falls Short
Glow-worm does not have the brand prestige of Baxi or the feature set of Ideal. The controls are basic. The display is small. Some homeowners feel it looks cheap next to a Logic Max or Baxi 800.
The Trustpilot score is lower than Baxi and Ideal, though it still holds a Which? Best Buy award for the Energy range. The gap in customer satisfaction often comes down to installation quality rather than the boiler itself. Glow-worm is popular with national installation firms who rush jobs. A poorly installed Glow-worm will fail just like any other boiler.
Bottom Line on Glow-worm
Glow-worm is the best budget boiler UK buyers can choose in 2026. It is perfect for landlords, first-time buyers, and anyone who wants a quiet, efficient, hydrogen-ready boiler without stretching their finances.
Model-Level Showdown: Ideal Logic Max vs Baxi 800 vs Glow-worm Energy
Let us get specific. These three models are the ones most homeowners compare when they want a mid-range combi boiler for a typical three-bedroom house.
| Specification | Ideal Logic Max 30 | Baxi 830 | Glow-worm Energy 30 |
|---|---|---|---|
| Output (kW) | 30kW | 30kW | 30kW |
| Flow rate (l/min) | 12.4 | 12.2 | 12.2 |
| Efficiency | 94% | 93% | 94% |
| Heat exchanger | Aluminium | Stainless steel | Aluminium |
| Warranty (max) | 10 years | 10 years | 10 years |
| Typical fitted price | £2,200 – £2,600 | £2,100 – £2,500 | £1,900 – £2,300 |
| Weight | 38.5kg | 29.5kg | 38.5kg |
| Compact cupboard fit | Yes | Yes (lighter) | Yes |
| Smart thermostat ready | Yes | Yes | Yes |
The specs are remarkably close. All three will heat a three-bedroom semi-detached house with one bathroom comfortably. The Baxi 830 is noticeably lighter, which makes installation easier in tight loft spaces. The Ideal Logic Max has the edge on display quality and control logic. The Glow-worm Energy wins on price and noise level.
For a 2 bedroom flat, any of these 30kW models is overkill. You would drop to the 24kW versions and save around £150 to £200 on the installation.
Boiler Warranty Comparison UK: Who Protects You Best?
Warranty is where this comparison gets interesting. All three brands advertise up to 10 years, but the small print differs.
Ideal offers a straightforward 10-year parts and labour warranty on Logic Max and Vogue Max models, provided you use an accredited installer and register within 30 days. There is no mandatory annual service plan, though annual servicing is obviously recommended.
Baxi offers 10 years on the 800 range and 7 years on the 600 range through accredited installers. The warranty is parts and labour. One catch: some merchants sell Baxi with a 2-year base warranty that the installer must extend. Always confirm your quote includes the full 10-year registration.
Glow-worm offers up to 10 years through its Club Energy accredited installers. The warranty is backed by Vaillant, so the payout process is reliable. Like Ideal, you need registration within 30 days.
Our advice? Do not buy based on headline warranty length alone. Buy based on who is installing it. A 10-year warranty from a boiler that was powerflushed properly, fitted with a magnetic filter, and commissioned correctly is worth more than a 10-year warranty on a rushed installation.
Price Comparison: Supply and Installation Costs 2026
These are the real-world prices we quote at Boiler Installer London for a straight swap combi-to-combi installation in 2026. Prices include the boiler, standard flue, horizontal termination, magnetic filter, system flush, Gas Safe certification, and building control notification.
| Boiler Model | Supply Only | Installed Price |
|---|---|---|
| Glow-worm Energy 30 | £850 | £1,900 – £2,100 |
| Baxi 600 30kW | £900 | £2,000 – £2,300 |
| Baxi 830 | £1,050 | £2,200 – £2,500 |
| Ideal Logic Max 30 | £1,100 | £2,300 – £2,600 |
| Ideal Vogue Max 32 | £1,400 | £2,700 – £3,200 |
| Glow-worm Ultimate 3 30 | £1,050 | £2,100 – £2,400 |
Prices rise in cases where you need a vertical flue, a plume management kit, a system conversion (from regular to combi), or relocation of the boiler. A system conversion from a regular boiler with tanks to a combi typically adds £400 to £600.
Best Boiler for Your Home: Property-Specific Recommendations
Best Combi Boiler for Small House Budget
A 1-bedroom flat or 2-bedroom terraced house with one bathroom does not need 30kW. The Glow-worm Energy 25 or Baxi 624 is perfect. Both are compact, quiet, and priced under £2,000 installed.
Best Boiler for 3 Bed House
The Ideal Logic Max 30, Baxi 830, or Glow-worm Energy 30 are the correct choices. Any of these will run a three-bedroom house with one bathroom. If you have two bathrooms and want to run two showers simultaneously, step up to a 35kW model or consider a system boiler with a cylinder.
Baxi or Ideal for 2 Bedroom Flat?
We lean toward Baxi in flats. The lighter weight makes loft installations easier, and the stainless steel heat exchanger is more forgiving in older buildings with questionable water quality. The Baxi 824 is a superb flat boiler.
Best for Landlords
Glow-worm and Baxi are the landlord favourites. Glow-worm wins on upfront cost. Baxi wins on long-term serviceability. Ideal is less popular with landlords because the extra features go unused in rental properties.
Best for Large Homes (4+ Beds, 2+ Baths)
You need more power or a system boiler setup. The Ideal Vogue Max 40 system boiler paired with a cylinder is a strong setup. The Baxi 800 35kW combi can handle larger homes if you do not want a cylinder.
Efficiency, Running Costs and Hydrogen-Ready Status
All three brands offer ErP A-rated efficiency, typically between 93% and 94%. In real terms, that means for every £1 you spend on gas, around 93p heats your home and water. The other 7p is lost.
The difference between 93% and 94% efficiency will not show up on your bill in any meaningful way. What matters more is the quality of the installation, the insulation in your home, and whether your heating controls are set correctly.
All three are hydrogen-ready for a 20% blend. None are currently 100% hydrogen-ready, because the UK grid is not there yet. Do not let a salesperson tell you otherwise.
Reliability and Customer Satisfaction
Baxi scores highest on Trustpilot at around 4.6 out of 5. Engineers respect the brand, and parts are stocked everywhere.
Ideal sits around 4.5 out of 5. The brand has climbed steadily as build quality improved. The Logic Max range rarely comes back to us with faults within the first five years.
Glow-worm scores lower on Trustpilot at around 3.0, but holds a Which? Best Buy award for the Energy range. The Trustpilot score is often dragged down by national installation companies with poor aftercare, not the boiler itself.
In our experience, all three brands are reliable when installed correctly. The biggest cause of early failure across all three is a dirty system. A proper powerflush and a magnetic filter are non-negotiable.
Expert Tips: What Installers Know That You Don’t
1. Always check the installer accreditation. A 10-year warranty only applies when fitted by an approved installer. At Boiler Installer London, we are accredited for all three brands, so we can offer the maximum warranty on whichever boiler you choose.
2. Do not skip the filter. A magnetic filter costs around £150 to £200 fitted. It will save you thousands over the boiler’s life. We refuse to install any aluminium heat exchanger boiler without one.
3. Size the boiler properly. Bigger is not better. An oversized boiler cycles on and off, wastes gas, and wears out faster. A heat loss calculation takes 20 minutes and tells you exactly what you need.
4. Ask about the flue. Vertical flues through roofs cost more than horizontal wall flues. If you are replacing an old floor-standing boiler in a kitchen cupboard, the flue route might add £200 to £400.
5. Check your gas pipe. Modern boilers need a 22mm gas supply. Older 15mm pipes might need upgrading. This is a common hidden cost that catches homeowners out.
Common Mistakes When Buying a Boiler
Mistake 1: Choosing based on brand alone. The installer matters more than the badge on the front. A top-tier boiler fitted badly will fail before a budget boiler fitted well.
Mistake 2: Ignoring the warranty terms. Some warranties require annual servicing by an accredited engineer. Miss a year and you void the cover. Read the terms before you sign.
Mistake 3: Not flushing the system. We still see installers fitting new boilers onto sludge-filled systems. It is like putting a new engine into a car with dirty oil. Demand a system flush.
Mistake 4: Forgetting controls. A smart thermostat can save 10% to 15% on heating bills. Factor this into your budget. All three brands work with Hive, Nest, and their own branded smart stats.
Frequently Asked Questions
Which is better: Ideal, Baxi or Glow-worm?
Baxi wins on reliability and parts availability. Ideal wins on features and warranty length. Glow-worm wins on price and quiet operation. For most homeowners, Baxi offers the best balance of cost and dependability.
Are Glow-worm boilers as good as Baxi?
Glow-worm boilers are good, but they serve a different market. Baxi is positioned as a solid mid-range brand with stainless steel options. Glow-worm is the budget choice within the Vaillant Group. Both are reliable when installed correctly.
Which boiler has the longest warranty under £2,000?
The Glow-worm Energy range offers a 10-year warranty with approved installers and typically costs under £2,100 installed. The Baxi 600 can also reach 10 years through certain accredited installers at a similar price point.
What is the cheapest boiler to install in 2026?
The Glow-worm Energy 25 combi is the cheapest quality boiler to install in 2026, with fitted prices starting around £1,725. Avoid ultra-cheap unknown brands that sacrifice safety and efficiency.
Is the Ideal Logic Max better than the Baxi 800?
The Ideal Logic Max has a better display, a longer standard warranty, and more features. The Baxi 800 has a stainless steel heat exchanger and is lighter to install. For features, choose Ideal. For long-term durability in older systems, choose Baxi.
Which boiler is best for a 3 bedroom house?
Any 30kW combi from Ideal, Baxi, or Glow-worm will handle a 3-bedroom house with one bathroom. The Baxi 830, Ideal Logic Max 30, and Glow-worm Energy 30 are the correct choices.
Are these boilers hydrogen ready?
Yes. All Ideal, Baxi, and Glow-worm combi boilers sold in 2026 are ready for a 20% hydrogen blend. They are not yet 100% hydrogen-ready, as the UK grid has not transitioned.
How much does a boiler replacement cost UK in 2026?
A combi-to-combi replacement costs between £1,800 and £3,200 depending on the brand, model, and installation complexity. A system conversion from regular to combi adds £400 to £600.
Final Verdict: Ideal vs Baxi vs Glow-worm
You have three excellent options. None of these are boiler brands to avoid UK homeowners should fear. They are all safe, efficient, and hydrogen-ready.
Pick Ideal when you want the longest warranty, the best controls, and a boiler that feels modern. The Logic Max 30 is the standout model.
Pick Baxi when you want the engineer’s choice. Reliable, easy to fix, and built with a stainless steel heat exchanger in the 800 range. The Baxi 830 is our most-requested model for family homes.
Pick Glow-worm when you want the best value. Quiet, efficient, and backed by Vaillant. The Energy 30 is unbeatable on price.
Still not sure which boiler fits your home? At Boiler Installer London, we carry out free, no-obligation home surveys across London. We assess your property size, your water pressure, your existing system, and your budget. Then we recommend the right boiler, not the most expensive one.
Get your fixed-price quote today at boilerinstallerlondon.uk and find out whether Ideal, Baxi, or Glow-worm is the right choice for your home.