New Boilers UK 2026: Fixed Quotes & Installation
Need a new boiler? This guide explains new boiler costs, combi/system/regular boiler types, installation options, finance, warranties, discount codes, price match guarantees and how providers such as BOXT, Heatable, British Gas, WarmZilla and local Gas Safe engineers compare.
New boiler costs explained
Before comparing installers, it helps to understand what actually affects the price: boiler type, installation complexity, location, controls, filters, flue work, system cleaning, warranty length and whether the quote is genuinely like-for-like.
New boilers: what you need to know first
A new boiler is not just the appliance
The final price depends on the boiler model, warranty, controls, filters, flue work, pipework, system cleaning and installation complexity.
Combi boilers are common, not universal
Combis suit many smaller homes, but larger properties or homes with multiple bathrooms may need a system boiler and cylinder.
Online quotes suit simple swaps
BOXT, Heatable, WarmZilla and Boiler Central are often strongest where the job can be priced clearly online.
Complex installs need more scrutiny
Conversions, relocations, old pipework, unusual flues and cylinder changes can change both cost and installer choice.
Deals change constantly
Always check live discount codes, finance terms, price match rules, package inclusions and warranty conditions before ordering.
How much does a new boiler cost in the UK?
New boiler costs vary because the boiler itself is only part of the job. The final price depends on boiler type, model, warranty, installation complexity, controls, filters, flue work, pipework and whether the heating system needs cleaning or extra upgrades.
| New boiler job type | Typical complexity | What affects the price? |
|---|---|---|
| Like-for-like combi replacement | Lower | Boiler model, warranty, flue, controls, filter, system cleaning and installer pricing. |
| System boiler replacement | Medium | Boiler output, cylinder condition, controls, pipework and hot water setup. |
| Regular boiler replacement | Medium | Existing tanks/cylinder, heating controls, flue route and system condition. |
| Combi conversion | Higher | Removing tanks/cylinder, new pipework, water pressure, condensate route and making good. |
| Boiler relocation | Higher | New flue position, gas pipework, condensate pipe, electrics, access and wall repairs. |
Do not compare boiler quotes by headline price alone. Check boiler model, output, warranty, controls, filter, flush, flue work, condensate pipework, registration and workmanship cover.
What type of new boiler do you need?
The right boiler depends on your hot water demand, property size, current system, mains water pressure and whether you already have a hot water cylinder.
Best for many flats and smaller homes
A combi boiler provides heating and hot water from one compact unit, with no separate hot water cylinder.
Better for higher hot water demand
A system boiler works with a hot water cylinder and can suit homes with more bathrooms or heavier hot water use.
Common in older heating systems
A regular or heat-only boiler works with tanks and a cylinder. It may suit some larger or older properties.
Oil, LPG and electric options
Homes off the gas grid may need to compare oil, LPG, electric boilers and low-carbon heating alternatives.
What happens during a new boiler installation?
A new boiler installation usually starts with a quote or survey, followed by confirmation of boiler type, location, flue route, controls, warranty and any extra work required.
Online quote or survey
Online companies usually ask questions about your current boiler, home, bathrooms, fuel type and installation location. Complex jobs may need photos or a home survey.
Boiler recommendation
The installer should recommend a boiler type and output suitable for your home. Avoid choosing only by brand or discount.
Installation day
A simple like-for-like swap may be completed in a day. Conversions, relocations and more complex work can take longer.
Registration and handover
The engineer should test the boiler, explain how to use it and make sure the installation is correctly registered where required.
Best new boiler deals, discount codes and price match guarantees
Boiler deals change frequently. Use this section as a comparison framework, then check each provider’s live terms before ordering.
BOXT
BOXT publicly says it will beat identical fixed-price boiler installation quotes by £50.
Check: like-for-like terms, model, warranty, extras and exclusions.WarmZilla
WarmZilla publicly says it will beat a cheaper like-for-like boiler quote by £50.
Check: quote comparability, package inclusions and warranty terms.Heatable
Heatable’s terms say it may run discount codes and promotional campaigns from time to time.
Check: only one promotion or discount code may apply per order.British Gas
British Gas often uses seasonal boiler offers and national-brand positioning.
Check: selected models, offer dates, servicing terms and optional extras.BOXT vs Heatable vs British Gas vs WarmZilla vs local installers
Several companies can supply and install a new boiler, but they do not all work in the same way. Online boiler companies tend to focus on speed, fixed pricing and digital quotes, while traditional national installers and local engineers may be better suited to complex jobs.
| Option | Best for | Potential advantages | Things to check |
|---|---|---|---|
| BOXT | Fast online boiler quotes and straightforward replacements | Online quote journey, fixed-price positioning, next-day availability on some installs, finance options, national installer network, price match promise. | Whether your job is genuinely straightforward, what is included, photo/survey requirements, warranty terms and exclusions. |
| Heatable | Online boiler quotes with a simplified quote journey | Fast pricing, package-style comparison, online quote flow, finance options depending on eligibility, occasional promo codes. | Installer availability, exact package inclusions, warranty length, controls, filters and aftercare. |
| British Gas | Homeowners who want a large national brand and support network | Established brand, servicing options, care plans, broad national coverage, seasonal offers. | Price competitiveness, quote detail, optional extras, installation timeline and ongoing cover costs. |
| WarmZilla | Online quote comparison and price-conscious buyers | Online quote journey, best-price positioning, beat-by-£50 style guarantee. | Like-for-like quote terms, installer availability, warranty details and what is included. |
| Boiler Central | Online boiler quote shoppers comparing packages | Online pricing, package comparisons, finance options depending on eligibility. | Final installed price, extras, survey requirements, warranty and aftercare. |
| Local Gas Safe engineer | Complex jobs, bespoke work or homeowners who prefer a local relationship | Potentially flexible, useful for non-standard systems, direct relationship with installer. | Gas Safe registration, insurance, reviews, written quote, workmanship warranty and aftercare. |
How to compare new boiler quotes properly
New boiler quotes can look similar while including very different things. Use this checklist before deciding.
- Boiler model: compare equivalent models, not just brands.
- Output: check the recommended kW suits your home.
- Warranty: compare manufacturer warranty and workmanship cover.
- Controls: check whether thermostat, programmer or smart controls are included.
- Magnetic filter: check system protection is included.
- System cleaning: check whether a flush or cleanse is included.
- Flue work: check flue, plume kit and access requirements.
- Condensate pipework: check drainage route and freezing risk.
- Making good: check whether wall repairs or cupboard changes are included.
- Finance: compare total repayable amount, not just monthly cost.
Best new boiler brands and warranty checks
Popular UK boiler brands include Worcester Bosch, Vaillant, Ideal, Baxi, Viessmann and Alpha. The best choice depends on budget, installer recommendation, warranty expectations and your heating system.
Do not choose by brand alone
A strong brand still needs the right model, output, controls, installation quality and warranty registration.
Check the conditions
Warranty length may depend on correct installation, annual servicing, accessories and installer accreditation.
Separate from manufacturer warranty
Manufacturer warranty covers the appliance. Workmanship guarantee covers installation labour and varies by provider.
New boiler finance and grants
Many boiler companies offer finance, but monthly payments can hide the real total cost. Always compare the cash price, APR, deposit, monthly payment and total repayable amount.
Should you pay monthly?
Finance can help if your boiler fails unexpectedly, but the total repayable amount is the real price. Check APR, early repayment terms and whether servicing or care plans are bundled in.
Can you get a grant for a gas boiler?
There are not usually mainstream grants for standard new gas boiler replacements. The Boiler Upgrade Scheme is designed for low-carbon heating systems such as heat pumps and biomass boilers.
New boiler FAQs
Who offers a new boiler price match guarantee?
BOXT and WarmZilla both publicly advertise beat-by-£50 style guarantees on like-for-like boiler installation quotes. Check the current terms before relying on either.
Does Heatable offer discount codes?
Heatable’s terms say it may run discount codes and promotional campaigns. Its terms also say only one promotion or discount code can apply per order.
Is BOXT cheaper than British Gas?
It depends on your home, boiler model, installation type, finance terms and live offers. Compare like-for-like quotes before deciding.
How long does new boiler installation take?
A straightforward like-for-like replacement may be completed in one day. Conversions, relocations and complex heating system work can take longer.
Do I need a Gas Safe engineer?
Yes. Gas boiler work must be carried out by a suitably qualified Gas Safe registered engineer.
Should I repair or replace my boiler?
If the boiler is relatively new and the repair is minor, repair may be sensible. If it is old, unreliable or facing a large repair bill, replacement may be better value.
The best new boiler deal is the right boiler, fitted properly, at a fair total price
For a straightforward replacement, online providers such as BOXT, Heatable, Boiler Central and WarmZilla can be convenient. For complex jobs, a detailed survey from a national installer or trusted local Gas Safe engineer may be more appropriate.
Before ordering, compare like-for-like quotes, check live discount codes, confirm what is included and make sure the installer is properly qualified.
