If your boiler is on its way out and you are starting to think about replacement costs, you have probably already noticed that prices vary wildly depending on who you ask. One quote says £1,800, another says £4,500, and you have no idea what is actually included in either.
The truth is, boiler installation cost depends on several factors — the type of boiler, the brand, the size of your home, and how complex the installation is. In this guide, the team at Gorilla Heat gives you a clear, honest breakdown of what to expect to pay in 2026, what affects the price, and how to make sure you are getting value for money — not just the cheapest quote on the market.
Boiler Installation Cost at a Glance — 2026
Here is a straightforward overview of typical new boiler costs in the UK for 2026, including supply and installation:
| Boiler Type | Budget Range | Mid to Premium Range |
| Combi boiler | £1,800 – £2,500 | £2,500 – £3,500 |
| System boiler + cylinder | £2,500 – £3,200 | £3,200 – £4,500 |
| Regular / heat-only boiler | £2,200 – £3,000 | £3,000 – £4,200 |
| Combi conversion (from regular) | £2,500 – £3,500 | £3,500 – £4,500+ |
All figures above include the cost of the boiler unit itself, labour, and standard installation materials. They do not include extras such as a magnetic filter, flue extensions, or upgrades to the heating system.
What Affects the Cost of a New Boiler?
Understanding what drives the price up or down helps you compare quotes properly and avoid paying for things you do not need — or being caught out by things that were never included.
1. The Boiler Brand and Model
Brand is one of the biggest variables in boiler pricing. Budget-tier brands such as Ideal and Baxi come in at the lower end of the cost scale, while premium brands — Worcester Bosch, Viessmann, and Vaillant — cost more upfront but tend to offer better long-term reliability, longer warranties, and more comprehensive after-sales support.
As Worcester Bosch approved installers, Gorilla Heat fits the Greenstar range regularly. When installed by an approved installer, a Worcester Bosch boiler qualifies for an extended warranty of up to 12 years — which adds genuine long-term value that a budget boiler simply cannot match.
2. The Type of Boiler
A like-for-like combi replacement is the quickest and most affordable installation. Converting from a regular boiler to a combi — which involves removing the cylinder and loft tank and reconfiguring pipework — takes considerably longer and costs more in labour. A system boiler installation that includes a new hot water cylinder adds both materials and time to the job.
3. The Size of Your Home
Larger properties need a higher output boiler to heat more radiators and deliver adequate hot water across multiple bathrooms. Higher output models cost more to purchase and may require additional work to connect correctly into an older system. A flat needing a 24 kW combi is a very different job to a five-bedroom house needing a 35 kW system boiler and a new cylinder.
4. Where the Boiler Is Being Installed
A straight swap where the new boiler goes in exactly the same location as the old one is the most cost-effective scenario. Relocating the boiler to a different room — or moving it from inside the property to an external wall — involves additional pipework, flue work, and labour, which will push the cost up. Some installations also require the flue to be extended or repositioned to meet current regulations.
5. Additional Work Required
Some boiler installations require supplementary work that adds to the overall cost. Common extras include:
• Magnetic system filter: £100 to £200 — protects the new boiler from sludge damage. Most reputable installers fit one as standard
• Power flush: £300 to £600 — often recommended before fitting a new boiler into an older, contaminated system
• New thermostat or smart controls: £150 to £300 — modern controls improve efficiency and can pay for themselves over time
• Flue extensions or repositioning: £100 to £400 depending on complexity
• Removal of old cylinder or loft tank: £100 to £200 for a conversion job
A good installer will flag these upfront in a detailed quote rather than presenting them as surprise additions once work has started.
Boiler Cost by Brand — What You Can Expect to Pay
Here is how the main boiler brands compare on cost for a combi boiler including standard installation in 2026:
| Boiler Model | Supply & Install Cost | Warranty | Best For |
| Worcester Bosch Greenstar 4000 | £2,400 – £3,200 | Up to 12 years | Standard homes |
| Worcester Bosch Greenstar 8000 Style | £2,800 – £3,700 | Up to 12 years | Premium option |
| Worcester Bosch Greenstar System (+ Cylinder) | £2,900 – £4,600 | Up to 12 years | Higher-demand households |
All Worcester Bosch boilers fitted by Gorilla Heat carry the full extended manufacturer’s warranty of up to 12 years, since we’re an approved installer — a level of cover you don’t get from standard installers, regardless of brand.
What About the Cheapest Boiler Installation?
It is natural to look for the best price — but the cheapest boiler installation is rarely the best value. Here is what low-cost quotes often hide:
• No system filter included — sludge from your old system damages the new boiler within months
• Budget boiler brand — shorter warranties and higher failure rates mean more money spent on repairs
• Unregistered installers — Gas Safe registration is a legal requirement, not a bonus. An uncertified installation voids your warranty and home insurance
• Hidden extras — a headline price that excludes flue, disposal of old boiler, controls, or commissioning quickly becomes much more expensive once everything is added
A transparent, detailed quote from a Gas Safe registered installer is always worth more than a bargain price that raises questions.
Spread the Cost with 0% Finance
One of the most common reasons homeowners put off a boiler replacement is the upfront cost. At Gorilla Heat, we offer 0% finance on all new boiler installations. That means you can get a quality boiler installed today and spread the cost of new boiler and installation into comfortable monthly payments — with no interest added on top.
For example, a Worcester Bosch Greenstar 4000 installation at £2,800 spread over 24 months at 0% works out at just over £116 per month — while you start benefiting from lower energy bills straight away.
Is a New Boiler Worth the Cost?
For most homeowners with a boiler over 10 years old, the answer is yes — and the numbers bear that out. An old boiler running at 70% efficiency compared to a modern A-rated boiler running at 92% efficiency represents a significant difference in gas consumption every single month.
According to the Energy Saving Trust, replacing an old inefficient boiler with a modern condensing boiler and upgrading to a smart thermostat can save the average household between £200 and £350 per year in energy costs. At that rate, a mid-range boiler installation pays for itself within 8 to 10 years — while also reducing the risk of costly emergency callouts.
Get a Transparent Boiler Installation Quote from Gorilla Heat
We believe every homeowner deserves a clear, honest price before any work starts — no vague estimates, no surprise extras added on the day. At Gorilla Heat, every quote we provide is fully itemised, so you know exactly what you are paying for.
We are a veteran-owned, family-run business with over 20 years of experience, Gas Safe certified, and Worcester Bosch approved installers. We serve homeowners across Brigg, Scunthorpe, Barton-upon-Humber, Immingham, Grimsby, and the wider North Lincolnshire and East Yorkshire area.
Contact our team today for a free, no-obligation quote. We will assess your home, recommend the right boiler, and give you a fixed price with 0% finance available.
Frequently Asked Questions (Boiler Installation Cost)
How much does boiler installation cost in the UK in 2026?
A standard combi boiler installation in 2026 typically costs between £1,800 and £3,500 depending on the brand and model. System boiler installations including a new cylinder range from £2,500 to £4,500. Prices vary based on boiler type, property size, and whether additional work such as a power flush or system filter is required.
How much does a new combi boiler cost to install?
Combi boiler installation cost in the UK ranges from approximately £1,800 for a budget model to £3,500 for a premium brand such as Worcester Bosch. A like-for-like replacement where the boiler goes in the same location as the old one is the most affordable scenario. Conversions or relocations cost more due to additional pipework and labour.
What is included in a boiler installation quote?
A good boiler installation quote should include the cost of the boiler unit, all standard installation materials, labour, flue installation, commissioning, and Gas Safe registration of the new appliance. It should clearly state whether a magnetic filter, thermostat, power flush, or removal of the old boiler is included or quoted separately.
Is there a cheap boiler installation option that is still reliable?
Mid-range brands such as Baxi and Ideal offer reliable performance at a lower price point than premium brands, with installation costs typically between £1,800 and £2,800. These are a sensible choice for homeowners on a tighter budget. However, very cheap quotes should always be questioned — they may exclude essential items or come from engineers without proper Gas Safe registration.
Does Gorilla Heat offer finance on boiler installations?
Yes. Gorilla Heat offers 0% finance on all new boiler installations, allowing you to spread the cost into manageable monthly payments with no interest charges. Contact our team for a quote and to discuss the finance options available for your installation.