LPG Boiler Installation Costs in South Wales (2025 Guide)
If you’re looking for clear, honest information about lpg boiler installation costs.
If your home isn’t connected to mains gas, LPG boilers are a popular and efficient option. This guide explains real 2025 installation costs, what affects the price, tank requirements, and expert insights for off-grid homes across South Wales.
This page is part of our 2025 heating knowledge hub designed to help South Wales homeowners make confident decisions.
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Key takeaways
- Typical LPG boiler installation cost in South Wales: £2,00–£4,500
- Prices vary based on boiler type, installation complexity, and property size
- Additional costs can include flues, gas pipe upgrades, thermostats, filters, and relocation
- Most installations completed in 1 day by Blue Flame engineers
- All quotes include fixed pricing, LPG-certified installation, and guaranteed aftercare
- Free expert surveys available across South Wales
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.
LPG-certified Engineers
Fully qualified, insured, and legally certified. Safe, compliant installations every time with trusted engineers.
Guaranteed Aftercare & Support
Includes warranty registration, service reminders, fast support — plus FREE Silver Cover for 12 months.
Complimentary Silver Cover Included with Every Boiler Installation
Why this is included:
Included because we selectively install only the most reliable boilers and models. We back our work with in-house parts & labour warranty, we’re confident enough to include complimentary cover.
Continue Your Cover After Year One
Continue your protection from just £6.99 per month after the free first year.
- In-house parts & labour warranty
- 12 months complimentary Silver Cover
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Ongoing servicing continuity with the same local team
“It’s a benefit we can offer because we control the quality from installation to aftercare.”
What Affects the Cost?
The price of a LPG boiler installation in South Wales varies depending on a few key factors. These don’t just affect the upfront price — they also influence how long the job takes and what materials are required.
1. Boiler Type & Model
Different boiler systems come with different material and labour requirements.
Typical ranges (2025):
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Combi boilers: £1,800 – £3,500
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System boilers: £1,800 – £5,000
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Conventional (heat-only): £1,800 – £5,000
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Electric boilers: £1,800 – £5,500
- Higher-end boilers cost more but offer better efficiency, quieter operation, and longer warranties.
2. Installation Complexity
Some installs are simple like-for-like swaps. Others require more engineering time.
Costs increase when any of the following apply:
✔ Switching from a system/regular boiler to a combi
✔ Moving tanks or removing old cylinders
✔ Adding or upgrading pipework
✔ Installing additional safety or regulatory components
✔ Limited access (tight cupboard, attic, etc.)
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: £350 – £450
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Vertical flue: £350 – £550
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
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: £1,600 – £3,000
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Mid-terrace: £2,000 – £3,500
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Semi-detached: £2,500 – £4,000
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Detached: £3,000 – £5,500+
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
All quotes from Blue Flame include:
✔ Fixed pricing
✔ Gas Safe installation
✔ All required materials
✔ Full documentation
✔ Free Silver Cover (12 months)
✔ Warranty registration
Everything you need. No unexpected add-ons.
Typical Price Ranges in South Wales (2026 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 LPG 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)
| Property Type | Typical Cost (Inc Installation) |
|---|---|
| Small Flat / 1–2 Bedroom Home | £1,800 – £3,000 |
| Medium 2–3 Bedroom Home | £2,200 – £3,800 |
| Large 3–4 Bedroom Home | £2,800 – £4,500 |
| Large Detached / High-Demand Homes | £3,200 – £5,000+ |
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 LPG Boiler | £245 – £840 |
| Old F-rated LPG Boiler | £180 – £550 |
| Old E-rated LPG Boiler | £100 – £300 |
| Old D-rated LPG Boiler | £60 – £160 |
Quick Summary
Choosing the right boiler depends on your home size, heating demand, budget, and whether you want the simplest install or the most efficient long-term option. Here’s a quick breakdown:
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Combi boilers are ideal for small to large homes with upto 2 bathrooms.
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System boilers suit larger homes with higher hot-water demand. 2 bathrooms or more.
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Regular (heat-only) boilers are best when upgrading older systems with existing tanks. Ideal for all homes.
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Electric boilers work for homes without gas or with low heating demand.
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Oil and LPG boilers remain common in rural areas without mains gas.
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Installation costs vary based on boiler type, complexity, and home layout.
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A new A-rated boiler can reduce heating bills by £60–£840 per year.
All Blue Flame installations include:
✔ Fixed pricing
✔ LPG-certified installation
✔ All required materials
✔ Full documentation
✔ 12 months of Silver Cover (FREE)
Frequently Asked Questions
What is the Blue Flame In-House Warranty™?
The Blue Flame Warranty™ is your local, engineer-backed boiler warranty — designed to give you better protection than national companies.
It includes:
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12 months of free aftercare
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Priority breakdown response
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No call centres — you speak directly with our South Wales team
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All callouts handled by Blue Flame engineers
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Manufacturer parts supplied where needed
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Warranty stays valid with annual Blue Flame servicing
This is one of the strongest local warranties available and a major reason homeowners choose Blue Flame over national brands.
Do I need to service my boiler yearly to keep my warranty?
Yes. All manufacturers require annual servicing to keep the warranty valid. The same applies to the Blue Flame Warranty™. Annual services maintain boiler efficiency, safety, and long-term reliability.
Your first service is included free of charge in your Silver Cover aftercare. After year one, you can continue your protection from £6.99/month.
What affects the cost of a LPG boiler installation?
The final cost depends on factors such as boiler type (combi, system, regular), property size, installation complexity, and the condition of your existing system.
A like-for-like combi swap is the cheapest option. Conversions from system/regular to combi cost more due to tank removal and additional pipework.
Costs can also increase if flue upgrades are needed, if the boiler is being relocated, or if the PLG supply needs to be upgraded to 22mm to meet modern standards.
Blue Flame quotes include all materials, LPG-cerified installation, documentation, and free 12-month aftercare through the Blue Flame Warranty™.
How long does a new boiler installation usually take?
Most installations take a full day, depending on complexity. A simple combi-to-combi swap is typically finished in a single day. Conversions, flue upgrades, boiler relocations, or system cleanse can extend the work.
Regardless of the job type, Blue Flame engineers provide clear updates throughout the day and always complete full safety checks, commissioning, and registration before leaving your home.
What’s included in a Blue Flame boiler installation?
You receive a fully inclusive service:
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Fixed-price quote
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Gas Safe installation
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Magnetic filter (where required)
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System cleaning
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Wireless controls setup
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Full commissioning
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Digital documentation
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Warranty registration
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Free 12 months of Silver Cover aftercare
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Blue Flame Warranty™ — we handle all callouts in year one
No hidden extras. No upsells. No surprises.
Should I repair my old boiler or replace it?
Replacement is normally the best option if your boiler is over 12–15 years old, breaking down frequently, or inefficient compared to modern A-rated units.
Repairs make sense when the issue is minor and the boiler is still within its expected lifespan. Many homeowners now choose replacement for reliability, efficiency, and lower long-term running costs.
During your survey, a Blue Flame provides a clear, honest recommendation with no sales pressure.
What are the benefits of having an in-house warranty instead of relying only on manufacturers?
An in-house warranty gives homeowners faster, clearer and more reliable support. With most manufacturers, you’re routed through call centres, scheduled into national queues, and often left waiting days for an engineer.
With the Blue Flame Warranty™, all aftercare is handled directly by our local engineers, meaning quicker response times, one point of contact, and much less hassle. We diagnose faults, attend breakdowns, and only involve the manufacturer when a replacement part is required.
This gives you the reliability of a manufacturer warranty, but with the speed and service of a trusted local company.
Frequently Asked Questions
Do I need a plume kit for my new boiler?
A plume kit is required if the flue is too close to windows, doors, boundaries, or neighbouring properties. Many South Wales terrace homes need plume management due to tight spacing.
Costs typically range from £80–£150 and are included in your fixed-price quote if required. Not all homes need one, but Blue Flame assess this during your survey.
Will my LPG gas pipe need upgrading?
LPG boilers often require a larger gas pipe than older installations to ensure the correct gas flow and safe operation. Many existing LPG systems were originally installed with undersized pipework that no longer meets modern boiler requirements.
If your current LPG pipework is undersized, Blue Flame will upgrade it as part of the installation to meet manufacturer specifications and Gas Safe standards.
This is particularly common in older rural and off-grid properties. Any required pipe upgrades will be clearly identified during survey and included in your fixed-price quote, so there are no surprises.
Can a new boiler reduce my energy bills?
Yes. Replacing an old non-condensing boiler with a new A-rated model can reduce household energy usage significantly. Savings vary by home size, radiators, and usage habits, but many households save £200–£330 per year.
Optional upgrades such as smart controls, TRVs, filters, and system balancing can improve efficiency further. As part of your installation, Blue Flame recommends the best efficiency setup for your home.
What is the difference between a combi, system, and regular boiler?
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Combi boilers heat water on demand and suit small to medium homes with 1 bathroom.
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System boilers use a cylinder and work well for homes with higher hot-water demand.
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Regular (heat-only) boilers are best for older heating systems with tanks already installed.
Blue Flame engineers help you choose the most suitable option during your survey.
Do boiler quotes vary between companies?
Yes. Some national brands add extra charges for filters, flue components, or safety upgrades. Blue Flame pricing is fully transparent and includes all required materials, labour, and safety components.
Our quotes also include 12 months of free aftercare, so homeowners get far more value compared to national companies with higher overheads.
Plus the In-House The Blue Flame Warranty™
How does the installation process work with Blue Flame?
Our process is simple:
- Free quote or survey
- Fixed-price agreement
- Gas Safe installation
- System cleaning & testing
- Commissioning & documentation
- Warranty registration
- Your Blue Flame Warranty™ begins automatically
- You receive aftercare and reminders throughout the year
This system ensures full transparency and a stress-free installation.
Does the Blue Flame Warranty™ prevent blame-shifting between manufacturers and installers?
Yes — and this is one of its biggest advantages. With national installers, it’s common for manufacturers to blame the installer, and installers to blame the manufacturer, leaving homeowners stuck in the middle.
This removes that problem completely. We handle everything internally: diagnostics, callouts, communication, and arranging parts. If it’s an installation issue, we fix it. If it’s a boiler issue, we fix it.
There’s no finger-pointing, no confusion, and no delays — just a clear, accountable team that takes full responsibility for your boiler’s performance.