Boiler Installation & Replacement — UK-Wide, Qualified & Priced Up Front
A new boiler is a considered purchase, not a distress one — even when the old boiler forces the timing. Our your area installers quote fixed, itemised prices after a proper survey, and the cost table below gives you honest national bands before anyone visits.
What a new boiler costs
National bands, installed: a like-for-like combi swap typically £1,800–£2,800; converting a cylinder system to a combi £2,500–£4,000; a system boiler with unvented cylinder £2,800–£4,500 depending on cylinder size. Within each band, the boiler's brand tier, the warranty length, flue complexity and any pipework upgrades move the number. Every your area quote itemises those elements so you can see exactly what you're paying for — and what you could trim.
Expect £1,800–£2,800 for a straightforward combi replacement in the same location, more for conversions and relocations. The quote should always include: the boiler and flue, a magnetic filter, updated controls to current regulation, a chemical cleanse (or powerflush where sludge demands it), condensate connection, commissioning with benchmark record, and building-control notification. If a your area quote is dramatically cheaper than the band, check which of those it quietly omits.
Combi, system or heat-only — the honest steer
Combi boilers heat water on demand — no cylinder, no tank, ideal for homes with one bathroom and decent mains flow. System boilers feed an unvented cylinder: better for two-plus bathrooms running simultaneously, at the cost of cylinder space. Heat-only (conventional) boilers with tanks suit some older systems where wholesale conversion isn't worth it. The deciding facts are your bathroom count, mains flow rate and airing-cupboard real estate — not fashion.
The rule of thumb that survives contact with reality: one bathroom and reasonable mains pressure, choose a combi; family house where two showers run at 7.30am, choose a system boiler and cylinder; ageing gravity system in a house you're not renovating, a modern heat-only swap can be the pragmatic move. A good installer measures your mains flow before recommending — if nobody's run a tap into a jug, the recommendation is a guess.
What happens on installation day
A straight combi swap is typically a one-day job: old boiler drained and removed, new boiler mounted, flue fitted, condensate run, system cleansed and inhibitor added, magnetic filter fitted, controls connected, then commissioning — gas-rate and combustion checks, benchmark record completed, and a walkthrough of the controls. Conversions run two to three days. Water is off for part of the day; heating is live and tested before the installer leaves your your area home.
Day one, the outgoing boiler comes off and the new one goes up: flue, condensate, gas and water connections made, the system flushed and dosed, filter and controls fitted. Commissioning is the part that separates professionals — combustion analysed, gas rate verified, the benchmark log completed and building control notified. You end the day with a working system, a registered warranty and paperwork that will matter when you sell the house.
Warranties, paperwork and aftercare
Manufacturer warranties on new boilers run 5–12 years depending on brand and installer accreditation — but they're conditional: annual servicing by a Gas Safe engineer, recorded. Your installer should register the warranty, notify building control (you'll receive the certificate), and complete the benchmark section. Keep all three documents with the house papers; missing paperwork is a genuine friction point in your area conveyancing.
The boxes that must be ticked: warranty registered with the manufacturer within the deadline, building-control notification lodged (the Gas Safe notification handles this for gas installs), benchmark commissioning record completed in the boiler's log, and your first annual service booked eleven-ish months out to keep the warranty alive. Network installers do all four as standard — it's a condition of taking installation work through us.
| Item | Guide |
|---|---|
| Typical price band | £1,800–£4,500 |
| Pricing basis | fixed installed price after survey; band reflects boiler class and system changes |
| Typical timescale | 1 day |
| Funnel | Fixed quote after survey |
| Credentials | Gas Safe registered |
Carbon monoxide: what to watch for and how to respond — the warning signs on appliances, and why annual servicing is the main defence.
Frequently asked questions
How much is a new boiler in your area?
Most your area combi replacements land between £1,800 and £2,800 installed; conversions and system-boiler installs range higher, typically £2,500–£4,500. Your fixed quote follows a survey — the quote form on this page captures what the surveyor needs to price accurately.
How long does a boiler installation take?
A like-for-like combi swap: usually one day. A conversion from cylinder system to combi, or a relocation: two to three days. You'll be told the expected duration with the quote, and the heating is commissioned and working before the installer leaves.
Which boiler brand should I choose?
The honest answer: any of the major brands at the right size, installed well, will serve you. Differences lie in warranty length, parts availability and price tier. Our brand hub compares them factually — and a good installation matters more than the badge.
What size boiler do I need?
Size follows demand, not house pride: bedroom and bathroom count, radiator count and mains flow rate determine it. Oversizing wastes money and cycles the boiler; undersizing disappoints at the shower. The quote survey calculates it — our sizing guide explains the logic.
Is the quote really fixed?
Yes — after survey, the price is fixed and itemised. The only changes are ones you approve in advance (for example, if opening up reveals pipework that must be brought to standard). Doorstep additions are a breach of network standards, not a negotiating tactic.
Do I need a powerflush with a new boiler?
Not always. Every install includes at minimum a chemical cleanse and inhibitor; a full powerflush is quoted where sludge contamination demands it — old systems, cold radiator bottoms, previous sludge symptoms. Fitting a new boiler to a dirty system shortens its life, so the honest answer depends on your system's state.
Will you take away my old boiler?
Yes — removal and responsible disposal of the old appliance and any redundant tanks or cylinders is included in network quotes. Cylinder and tank removal in conversions is itemised so you can see its share of the price.
Can I get a new boiler on finance?
Many network installers offer finance options; terms vary by installer and are always stated in writing with the quote. Compare the total repayable against paying outright — we'd rather you saw the arithmetic than signed in a cold-house hurry.
Do new boilers come with smart controls?
Current regulations require time and temperature control as a minimum, and most quotes include a modern programmable or smart thermostat. Smart controls with weather compensation genuinely improve efficiency on compatible boilers — our controls guide covers what's worth paying for.