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Gas Safe engineers, every install
Gas Safe registered, personally certified for the gas work they do. Gas Safe registration 921521, verifiable on the Gas Safe Register.
Boilers & central heating
A-rated, correctly sized, fittedclean.
A fixed price in minutes, and no email needed to see it. Worcester Bosch and Vaillant, fitted tidily in a day, warranty registered for you.
Why this matters
A reliable new boiler, a fixed price, and a clean install you don't have to chase
Your boiler is either failing, ageing, or missing entirely. You want the right unit for your home, a fixed price, clean fitting, and the warranty sorted. That is what we do.
What you get
Reliable heat, good controls, and running costs you understand
The right unit for your home, fitted cleanly, with the warranty and controls sorted before we leave.
Our approach
Survey-first boiler replacement and full central heating design
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Correct sizing every time
Oversized boilers cycle constantly, wearing out faster and wasting gas. We size based on actual room-by-room heat loss, not square-footage rules of thumb.
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Smart thermostats included
Hive, Nest, or Tado as standard, properly configured at install so you actually use the features you paid for.
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Power-flush when it is warranted
We magnetic-check every existing system before we replace a boiler. Power-flush where it will make a real difference, not as a default upsell.
The process
How it works
No surprises, no jargon. A clear, documented path from your first call through to handover and the follow-up visit, so you always know what happens next and why.
01
Phone triage
A five-minute call to understand your current setup, what is going wrong, and whether a survey is worth booking. Sometimes the answer is a repair or a service, not a replacement.
02
Home survey
A Gas Safe engineer visits, checks the existing system, tests pressure and flow, reviews flue options, and asks what controls you actually want. Typically an hour on site.
03
Fixed quote, itemised
Within two working days: boiler model, flue kit, thermostat, any system upgrades (magnetic filter, power-flush, radiator valves), and the total fixed price. Warranty terms explained in plain English.
04
Installation
One to two days for a straight swap, three to five days for first-time central heating. Dust sheets throughout, Gas Safe certificate issued on completion, manufacturer warranty registered before we leave.
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Handover and aftercare
Walk-through of every control, first-year service included as standard, and a named contact for any question afterwards. Servicing reminders sent annually.
Our signature honesty
Where we won’t fit it
Your home is a strong heat pump candidate and you’re planning to stay 5+ years. A new combi now locks you into another decade of gas. Our Instant Quote tool will flag this automatically, or talk to us on the phone.
Your existing boiler is under 10 years old and just needs a power-flush. Roughly 30% of “replace my boiler” enquiries we see are actually “replace the controls and clean the system” jobs in disguise. We’d rather save you three grand.
The property can’t accommodate the flue routing safely. Very rare, but we won’t cut corners on regulations to fit a boiler.
You’re planning to convert a loft or extend in the next 12 months. A new boiler might end up needing to be moved. Worth a conversation about timing.
In every case, if we say no to your first ask, we’ll say yes to the right alternative.
The figures we stand behind.
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Up to 10-year manufacturer warranty
Worcester Bosch, Vaillant, and Viessmann partners, giving you access to extended warranties not available through online-quote installers.
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A-rated efficiency, properly commissioned
Modern condensing boilers recover heat from flue gases. But efficiency depends on flow temperature and controls. We commission yours to actually achieve its rated figures.
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Smart controls that work from day one
Thermostat paired, zones configured, schedules set up with you, not just left for you to figure out from the app.
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Honest repair-vs-replace advice
If your boiler has another five good years in it, we will tell you. We do not earn commission from selling boilers you do not need.
Independently audited
The certifications behind this work
03 registers held · verifiable with each issuing body
- 02Worcester Bosch AccreditedVerify entry
- 03Vaillant AdvanceVerify entry
Straight answers
Frequently asked questions
06 questions · asked on real surveys
Q01 / 06
How do I know if I need a replacement or a repair?
Age (over fifteen years), reliability (more than one breakdown per winter), efficiency (SEDBUK below 85%), parts availability, and safety (any amber or red flags on service) are the key factors. We will never recommend replacement over repair when repair is the better long-term value.
Q01How do I know if I need a replacement or a repair?
Age (over fifteen years), reliability (more than one breakdown per winter), efficiency (SEDBUK below 85%), parts availability, and safety (any amber or red flags on service) are the key factors. We will never recommend replacement over repair when repair is the better long-term value.
Q02Combi, system, or regular: which is right for me?
Combi boilers suit smaller homes with one bathroom. System boilers with a cylinder suit larger homes or properties with high simultaneous hot water demand (two showers running, for example). Regular (heat-only) boilers suit older properties with existing cold water tanks and gravity-fed systems. We design around your actual hot water demand, not a default.
Q03What does first-time central heating cost?
For a typical three-bed house with no existing pipework, a full first-time central heating installation (boiler, pipework, radiators, thermostat, flue) is usually in the £5,500–£8,500 range depending on property size and complexity. We provide a fixed price at survey. No subsequent surprises.
Q04Do I need a power-flush?
Only if your system is actually contaminated, which we check with a magnetic filter during survey. Power-flushing a clean system is a waste of your money. We flush where it is warranted and fit a magnetic filter as standard on every install to protect the new boiler going forward.
Q05Is 0% finance available?
Yes. We offer 24 or 36 month 0% finance on installations over £1,500, subject to credit check. The finance provider is a regulated UK lender and the process is entirely online. No early repayment penalties.
Q06Should I consider a heat pump instead?
For most homes with a reasonable EPC and some insulation, yes. A heat pump is the lower-cost, lower-carbon choice in the medium term, and the £7,500 BUS grant makes the upfront gap smaller than you might expect. We will tell you honestly whether your property suits one before taking a boiler order. See our heat pump page for details.
Take the next step
Ready to talk about boilers & first time central heating?
Book a free survey. A qualified engineer will visit, assess your property honestly, and send a written recommendation within five working days. No obligation.
The honest range.
Typical installed price · 3-bed semi · combi replacement
£2,485–£3,570
for a typical 3-bed family home. Includes the boiler, magnetic filter, smart thermostat (Hive/Nest/Honeywell, your choice), first year's service, up to 10-year manufacturer warranty registered in your name, old-boiler removal, and a standard flue up to 2 metres.
A free survey is how we turn this range into a fixed price. We'll never ask you to commit before the written plan is in your hands.
What moves this price for your home
What moves the price upWhat holds it at baseWhat brings it down
Driver 01 · tap what matches
Driver 02 · tap what matches
Driver 03 · tap what matches
Driver 04 · tap what matches
OutlookAnswer the rows and we'll sketch where in the range your home is likely to land.
There is no government grant for a gas boiler, and 0% VAT does not apply to it. We are upfront about that. The value is the fixed price plus a long, properly registered warranty, with finance to spread the cost.
See what competitors charge separately →
Updated 25 April 2026 · quarterly
The full picture
10-year total cost: typical 3-bed combi swap.
| Cost component | Smart Energie | Online Installer A | Online Installer B | National Provider |
|---|---|---|---|---|
| Boiler install (headline) | £2,485 | £3,100 | £2,800 | £4,800 |
| Magnetic filter (industry standard, often charged extra) | Included | £180 | £150 | £200 |
| Smart thermostat (Hive/Nest/Honeywell) | Included | £200 | £180 | Included |
| First annual service (Year 1) | Included | £95 | £90 | £115 |
| Old boiler removal and disposal | Included | £80 | £60 | Included |
| Flue complexity: up to 2m standard wall | Included | £120 | £90 | Included |
| Warranty years included (manufacturer) | 10 years | 7–10 | 5–10 | 10 years |
| Years 2–10 annual service (9 × £95 avg) | £855 | £855 | £810 | £1,035 |
| 10-year TCO (install + consumables + service) | £3,340 | £4,630 | £4,090 | £6,150 |
| Probability of costly mid-term rework1 | Low (own engineer on call) | Medium (subcontractor network) | Medium (online-first model) | Low |
1 Anonymised survey of 200 post-install repair cases UK-wide, 2024–2025. Not exhaustive. Indicative only.
Smart Energie
- Boiler install (headline)
- £2,485
- Magnetic filter (industry standard, often charged extra)
- Included
- Smart thermostat (Hive/Nest/Honeywell)
- Included
- First annual service (Year 1)
- Included
- Old boiler removal and disposal
- Included
- Flue complexity: up to 2m standard wall
- Included
- Warranty years included (manufacturer)
- 10 years
- Years 2–10 annual service (9 × £95 avg)
- £855
- 10-year TCO
- £3,340
- Mid-term rework probability1
- Low (own engineer on call)
Online Installer A
- Boiler install (headline)
- £3,100
- Magnetic filter (industry standard, often charged extra)
- £180
- Smart thermostat (Hive/Nest/Honeywell)
- £200
- First annual service (Year 1)
- £95
- Old boiler removal and disposal
- £80
- Flue complexity: up to 2m standard wall
- £120
- Warranty years included (manufacturer)
- 7–10
- Years 2–10 annual service (9 × £95 avg)
- £855
- 10-year TCO
- £4,630
- Mid-term rework probability1
- Medium (subcontractor network)
Online Installer B
- Boiler install (headline)
- £2,800
- Magnetic filter (industry standard, often charged extra)
- £150
- Smart thermostat (Hive/Nest/Honeywell)
- £180
- First annual service (Year 1)
- £90
- Old boiler removal and disposal
- £60
- Flue complexity: up to 2m standard wall
- £90
- Warranty years included (manufacturer)
- 5–10
- Years 2–10 annual service (9 × £95 avg)
- £810
- 10-year TCO
- £4,090
- Mid-term rework probability1
- Medium (online-first model)
National Provider
- Boiler install (headline)
- £4,800
- Magnetic filter (industry standard, often charged extra)
- £200
- Smart thermostat (Hive/Nest/Honeywell)
- Included
- First annual service (Year 1)
- £115
- Old boiler removal and disposal
- Included
- Flue complexity: up to 2m standard wall
- Included
- Warranty years included (manufacturer)
- 10 years
- Years 2–10 annual service (9 × £95 avg)
- £1,035
- 10-year TCO
- £6,150
- Mid-term rework probability1
- Low
1 Anonymised survey of 200 post-install repair cases UK-wide, 2024–2025. Not exhaustive. Indicative only.
If you're optimising for the lowest possible 10-year cost on a gas combi and your property is simple, an online-first installer may be the right choice. What they won't give you is the same-engineer accountability if something goes wrong in year three, or a written survey before install, or any meaningful advice if a heat pump would have been a better decision. If those things don't matter to you, we're not your best choice. If they do, we are.