New Boiler Installation Cost in South Wales
If you’re looking for clear, honest information on new boiler installation cost (2025)
If you’re comparing new boiler installation costs in 2025, this guide gives you the full picture — real installation costs, brand comparisons, upgrade options, conversion prices, and expert insights from Gas Safe engineers with over a decade of hands-on experience.
We’ve installed thousands of boilers across South Wales, and this guide brings together everything we’ve learned into one clear, honest breakdown — designed to help you choose the right boiler at the right price.
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Key takeaways
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Typical new boiler installation cost in South Wales: £2,000–£4,500, depending on boiler type, installation complexity, and home layout.
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Combi, system, and regular boilers each have different price bands — with conversion work costing slightly more.
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Additional costs can include flue upgrades, thermostats, pipework changes, filters, and relocation work, depending on survey findings.
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Most installations are completed in 1 day by our in-house Gas Safe engineers.
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All quotes include fixed pricing, full safety checks, documentation, and 12 months of FREE Silver Cover.
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Free expert surveys and home assessments available across all South Wales areas.
**All installations include the Blue Flame Warranty™ — we handle all callouts directly**
Why Homeowners Choose Blue Flame for Boiler Installations
Award-winning boiler installers trusted across South Wales. Fixed-price quotes, expert engineers, and full aftercare with every installation.
Fast Installation Turnaround
Most boilers installed within 24–48 hours. Same-day surveys available in many South Wales areas.
Fixed-Price Boiler Quotes
Transparent, all-inclusive prices with no hidden extras. Fully guaranteed fixed installation price.
Gas Safe Registered Engineers
Fully qualified, insured, and legally certified. Safe, compliant installations every time with trusted engineers.
Guaranteed Aftercare & Support
Includes warranty registration, service reminders, and fast support — plus FREE Silver Cover for 12 months.
FREE Boiler Cover Included (Worth £143)
12 Months of Silver Cover with Every New Installation.
Your installation price already includes your first-year service, safety checks, reminders, and full aftercare — at no extra cost.
✔ Annual Boiler Service Included
Your full boiler service completed automatically within the first 12 months.
✔ Priority Breakdown Callouts
If you need us, you jump the queue — priority engineer response.
✔ Safety Checks & Service Reminders
Never miss a service. Automatic reminders by email and text.
✔ Full Aftercare & Support
Warranty registration, documentation, advice — all handled by us.
Switch to Silver Cover after Year 1
Continue your protection from just £6.99 per month after the free first year.
What Affects the Cost of a New Boiler Installation?
The price of a new boiler installation in South Wales varies based on a few key factors. These don’t just affect the upfront cost — they also influence how long the job takes and what materials are required.
1. Boiler Type & Model
Different boiler types require different labour, parts, and installation time:
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Combi boilers – quickest installs, ideal for small–medium homes
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System boilers – suited to homes with higher hot-water demand
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Regular (heat-only) boilers – best for older systems with tanks
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Back boiler conversions – more complex, higher labour time
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Premium models – Worcester, Vaillant, Viessmann, Ideal Logic Max etc.
2. Installation Complexity
Some homes need extra work to ensure the system runs safely and efficiently:
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Flue upgrades or extended flue runs
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Gas pipe upgrades (e.g., 15mm → 22mm)
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Relocation of boiler to a different room
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Additional pipework or rerouting
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Tight or awkward installation spaces
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Removal of old boiler, tanks, or pipework.
3. Flue Setup (Horizontal / Vertical)
The flue is a key safety component and can affect labour time.
Typical ranges:
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Horizontal flue: £150 – £450
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Vertical flue: £350 – £850
Vertical flues require more labour and often need roof access — which increases cost.
4. Plume Kit (if required)
Required when a flue terminal is too close to windows, doors, or boundaries.
Average cost: £80 – £150
Not every home needs one — but many terrace and semi-detached homes do.
5. Gas Pipe Upgrade (15mm → 22mm)
To meet Gas Safe and boiler manufacturer requirements, most modern boilers require a 22mm gas supply.
Typical cost: £200 – £800
Blue Flame upgrade cost: Included where required (no additional labour cost)
This is a major hidden cost most companies don’t explain upfront.
6. Boiler Relocation
Moving a boiler is one of the biggest cost changers.
Typical ranges:
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Same room: £400 – £800
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Different room: £700 – £1,000
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Different floor: £800 – £1,200
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Loft/attic: £800 – £1,200
More copper, more labour, more materials → higher cost.
7. Additional Upgrades (Optional / Recommended)
Many installations require or benefit from additional components:
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Magnetic filter: £80 – £120
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Chemical flush: £20 – £60
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Smart thermostat (Nest/Hive/Tado): £40 – £80
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New radiators (per radiator): £200 – £400
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TRVs: £15 – £30 each
Blue Flame includes a magnetic filter as part of most installs.
8. Property Size & Layout
Larger or more complex homes can require:
✔ More pipework
✔ More radiators
✔ More labour time
✔ Larger boiler outputs
Typical home ranges:
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Flat / apartment: £1,800 – £3,000
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Mid-terrace: £2,200 – £3,600
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Semi-detached: £2,400 – £4,000
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Detached: £3,000 – £5,000+
9. Radiator Condition & System Health
Older or heavily-sludged heating systems can affect boiler performance and installation requirements.
Typical checks include:
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Radiator cold spots or slow heat-up
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Poor circulation caused by sludge build-up
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Old TRVs that no longer work efficiently
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Blocked pipework restricting flow
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System pressure dropping regularly
Why it matters:
A new boiler works best with a clean, free-flowing system. In some cases, a power flush or chemical clean is recommended to protect the new boiler and improve whole-home performance.
10. Boiler Controls & Thermostats
Modern controls help your system run more efficiently — and are now recommended by most manufacturers.
Common control types:
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Basic on/off digital thermostats
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Wireless programmable thermostats
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Smart controls (Hive, Nest, Tado)
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Weather-compensating controls
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Load-compensating controls (mandatory on new installs)
Installation impact:
Smart controls may require additional wiring, receivers, or setup time during installation — slightly increasing labour.
11. Smart Thermostat Upgrades (Optional)
Upgrading to a smart heating system is one of the easiest ways to improve comfort and reduce bills.
Benefits include:
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Control heating from your phone
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More accurate temperature management
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Energy-usage insights
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Eco modes & scheduling
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Long-term cost savings
Typical price range (2025):
£120 – £250 for supply & setup, depending on brand.
Blue Flame installs Nest, Hive, Tado and other leading smart systems.
12. Chemical Flush & Water Treatment
Every new installation requires proper system protection — and this is where water treatment comes in.
Your installation includes:
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Full chemical cleanse
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Inhibitor added after installation
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Magnetic filter (included at no extra cost)
Why this matters:
Good water quality prevents corrosion, sludge build-up, and premature boiler failures. It also helps maintain efficiency and protects your manufacturer warranty.
Blue Flame Promise — No Hidden Extras
The Blue Flame Warranty™ means no back-and-forth between manufacturers — all support is handled by our engineers, directly.
Every Blue Flame installation includes:
✔ Fixed-price quote — the price you see is the price you pay
✔ Gas Safe installation by local, award-winning engineers
✔ All required materials & components included upfront
✔ Magnetic filter (where required) installed at no extra cost
✔ System cleaning and full safety checks
✔ Digital documentation for your records and warranty
✔ Warranty registration handled directly by our team
✔ FREE 12 months of Silver Cover (aftercare, reminders & fast support)
No upsells. No surprises. No call centres.
Typical Price Ranges in South Wales (2025 Guide)
Body content (use exactly as below):
Every home is different — but these ranges give you a realistic idea of what homeowners typically pay for a new gas boiler installation in South Wales.
Combi Boilers (Most Popular)
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Small flat/home: £1,800 – £2,300
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2–3 bedroom home: £2,200 – £3,000
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Larger home: £3,000+
System Boilers
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Typical range: £1,900 – £3,000
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Ideal for properties with a hot-water cylinder
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Often chosen for bigger or busier homes
Conventional Boilers (Regular / Heat-Only)
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Typical range: £2,000 – £3,500
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Includes removal of tanks & pipework (if upgrading)
Electric Boilers
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Typical range: £1,800 – £3,500
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Suitable for smaller homes, flats, or areas without gas
Oil Boilers
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Typical range: £2,200 – £5,000
Quick note:
Blue Flame quotes always include all materials, Gas Safe installation, documentation, and 12 months of Silver Cover.
Estimated Costs by Property Type (2025)
Every home is different — but these ranges show what homeowners in South Wales typically pay for a gas boiler installation based on property size and layout.
| Property Type | Typical Cost (Inc Installation) |
|---|---|
| Small Flat / 1–2 Bedroom Home | £1,800 – £2,300 |
| Medium 2–3 Bedroom Home | £2,200 – £3,000 |
| Large 3–4 Bedroom Home | £3,000 – £5,000 |
| Homes with multiple bathrooms or commercial | £4,000 – £8,500+ |
Note: Property size affects the boiler output needed, the amount of labour, and the heating system requirements — all of which influence the total installation cost.
Grants & ECO4 Funding (Are You Eligible?)
If you meet certain criteria, you may qualify for a new A-rated boiler fully funded through the Government’s ECO4 scheme. This programme helps households improve energy efficiency and reduce heating costs.
You may qualify if your home has:
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A low EPC rating (E, F or G)
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An old, inefficient boiler
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Poor insulation or high heating bills
And you receive one of the following:
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Universal Credit
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Child Benefit (income-based criteria)
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Income Support
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Jobseeker’s Allowance
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Working Tax Credit
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Housing Benefit
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Pension Credit
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Income-related ESA
If you’re not sure, we can check eligibility for you in less than 60 seconds.
Call us or click Contact Us — we’ll run a free ECO4 eligibility check for your home.
How Much Could You Save With a New A-Rated Boiler?
A new, energy-efficient boiler can reduce your heating bills immediately — especially if your current boiler is older, oversized, or losing heat through poor efficiency.
Below is a simple guide showing typical savings for homes in South Wales after upgrading to a new A-rated boiler.
Annual Savings (Based on Energy Savings Trust Data)
| Current Boiler Type | Estimated Annual Saving |
|---|---|
| Old G-rated Boiler | £245 – £840 |
| Old F-rated Boiler | £180 – £550 |
| Old E-rated Boiler | £100 – £300 |
| Old D-rated Boiler | £60 – £160 |
Quick Summary
A new boiler installation in South Wales typically ranges from £2,000–£4,500, depending on your home size, boiler type, installation complexity, and any upgrades required (such as moving the boiler, adding filters, or upgrading gas pipework).
You can also compare detailed installation costs by boiler type and fuel source in our cost guides →
Here’s a quick breakdown of what homeowners can expect:
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Combi boilers suit small to medium homes and offer the lowest installation cost
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System boilers suit larger homes with higher hot-water demand
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Regular / heat-only boilers are best when replacing older traditional systems
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Installation costs vary based on flue setup, access, relocation, and extras
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A new A-rated boiler can reduce heating bills by £60–£840 per year
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Most installations are completed in 1 day by Blue Flame engineers
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Older boilers (G/F/E rated) waste far more energy — replacing them can significantly reduce bills
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Blue Flame quotes are always fixed-price — no call centres, no upsells, no hidden extras
All Blue Flame installations include:
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Fixed-price quote
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Gas Safe installation
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All required materials
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Full documentation
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FREE 12 months of Silver Cover (aftercare, reminders, fast support)
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The Blue Flame Warranty™ — we handle all callouts directly
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Warranty registration handled by our team
The Blue Flame Warranty™ gives homeowners faster, clearer, and more reliable support — with all callouts managed by trusted local engineers, not national call centres.
Local experts. No surprises. No national-company pricing. Just safe, honest, expert installations.
Frequently Asked Questions
What is the Blue Flame In-House Warranty™?
Blue Flame’s In-House Warranty™ is a unique, engineer-backed protection system where all callouts, diagnosis, and aftercare are handled directly by our own local Gas Safe team — not a manufacturer helpline or national call centre.
You get:
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Fast local response, usually same or next day
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Clear diagnosis without blame-shifting between installer and manufacturer
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Free Silver Cover for 12 months, including breakdown response, safety checks, reminders & documentation
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Direct communication with the engineers who installed your boiler
This warranty removes the frustration homeowners often experience with big-brand installations, where manufacturers and installers dispute responsibility.
With Blue Flame, you deal with one expert team — start to finish.
Do I need to service my boiler yearly to keep my warranty?
Yes — all manufacturers require annual servicing, and it’s also required to keep your Blue Flame In-House Warranty™ active.
Your annual service includes:
✔ Combustion analysis
✔ Safety checks
✔ Inspection of key components
✔ Digital service documentation (ideal for warranty proof and home resale)
If you service elsewhere, you simply need to provide a full PDF report to keep your warranty validated.
What affects the cost of a gas boiler installation?
Installation cost depends on several core factors:
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Boiler type (combi, system, regular)
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Property size & hot-water demand
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Installation complexity — moving boilers, tight access, flue changes
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Gas pipe upgrades (many homes need a 15mm → 22mm upgrade to meet Gas Safe requirements)
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Optional extras such as filters, smart thermostats, or system cleans
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Relocation work (loft, garage, or new room)
Because every home is different, Blue Flame provides fixed, all-inclusive quotes with no hidden extras — something many national installers do not offer upfront.
How long does a new boiler installation usually take?
Most Blue Flame boiler installations are completed within 24–48 hours, depending on complexity.
Typical timelines:
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Straight combi swap: same day
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System → combi conversion: 1–2 days
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Full relocation or upgrades: 2 days
All work includes full cleanup, benchmarking, digital documentation, and FREE 12-month Silver Cover.
What’s included in a Blue Flame boiler installation?
Every installation includes:
✔ Fixed-price quote
✔ Gas Safe installation by our own engineers (no subcontractors)
✔ All required materials
✔ Magnetic filter (where appropriate)
✔ System clean & safety checks
✔ Full digital documentation
✔ Warranty registration handled directly by our team
✔ FREE 12 months of Silver Cover
✔ Our In-House Warranty™ — all callouts managed by Blue Flame
You don’t get this full package from the big national installers — we purposely built it to be better.
Should I repair my old boiler or replace it?
Replacement is usually recommended if:
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The boiler is 10–15 years old
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Repairs are becoming frequent or expensive
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Parts are discontinued or limited
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Your hot water performance is inconsistent
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Efficiency is poor (high gas bills or cold radiators)
A new A-rated boiler can reduce heating bills by £60–£840 per year depending on your current boiler grade (based on Energy Saving Trust data).
What are the benefits of having an in-house warranty instead of relying only on manufacturers?
Manufacturer warranties sound great — until something goes wrong.
Homeowners often face:
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Long call centre wait times
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Slow engineer availability
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Disputes between installer vs manufacturer about fault responsibility
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Third-party subcontractors who have never seen your installation
The Blue Flame In-House Warranty™ eliminates all of this:
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We diagnose and repair directly
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No passing the blame
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One team responsible for everything
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Faster, local aftercare
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Clear accountability
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Zero-stress warranty process
This is one of your strongest USPs. Keep pushing it.
Frequently Asked Questions
Do I need a plume kit for my new boiler?
A plume kit is required when the flue exhaust is too close to windows, doors, paths, or neighbour boundaries.
Survey will confirm, but typical reasons include:
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Low-set flues
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Conservatories or extensions
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Terraced or semi-detached homes with tight spacing
Blue Flame checks all distances during the home survey and includes plume kits in quotes if needed — no surprise add-ons.
Will my gas pipe need upgrading to 22mm?
Often — yes.
Modern boilers require a 22mm gas supply to meet Gas Safe & manufacturer flow-rate standards.
Many homes still have 15mm pipework which can:
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Cause poor boiler performance
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Cause gas pressure drop
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Void manufacturer warranty if left unchanged
Blue Flame assesses this during your survey and includes upgrades in your fixed-price quote where required.
Can a new boiler reduce my energy bills?
Yes — significantly.
Upgrading to an A-rated boiler can reduce annual heating bills by £60–£840 depending on your current boiler’s efficiency rating and property size.
Modern boilers also:
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Condense more efficiently
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Recover heat better
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Allow for smart thermostat control
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Lower carbon emissions
What is the difference between a combi, system, and regular boiler?
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Combi boilers – Heat water on demand. Ideal for most 1–3 bedroom homes. No tanks or cylinders required.
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System boilers – Work with a hot-water cylinder. Best for larger homes with higher hot-water demand.
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Regular (heat-only) boilers – Use both tanks and cylinders. Ideal for older properties with existing system layouts.
Blue Flame provides independent guidance on which system is best for your home layout.
Do boiler quotes vary between companies?
Yes — dramatically.
Prices differ due to:
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Labour approach (in-house engineers vs subcontractors)
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Materials quality
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Gas pipe upgrades
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Flue configurations
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Warranty type
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Aftercare support
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Hidden extras
Blue Flame provides transparent, fixed-price quotes with full inclusions published upfront — no upsells, no call-centre surprises.
How does the installation process work with Blue Flame?
Your installation runs on a simple 3-step process:
1️⃣ Quick Quote or Home Survey
We confirm boiler size, location, and any upgrades.
2️⃣ Installation Day
Our own Gas Safe engineers complete the install, clean down, benchmark the boiler, and handle documentation.
3️⃣ Aftercare & Warranty
You get 12 months FREE Silver Cover + the Blue Flame In-House Warranty™.
Everything stays in-house.
Does the Blue Flame Warranty™ prevent blame-shifting between manufacturers and installers?
Yes — that’s the entire point.
Most national companies rely on manufacturer warranties, which often leads to this cycle:
Manufacturer: “It’s an installation fault.”
Installer: “It’s a manufacturing issue.”
Homeowner: Stuck in the middle.
With Blue Flame:
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We diagnose. We repair. We take responsibility.
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No finger pointing
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No call centre loops
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No delays