New Boiler Installation in Lambeth
A new boiler is a considered purchase, not a distress one — even when the old boiler forces the timing. Our Lambeth 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 Lambeth quote itemises those elements so you can see exactly what you're paying for — and what you could trim.
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 Lambeth home.
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 Lambeth conveyancing.
Water quality quietly decides how long heating components last around Lambeth. Lambeth's supply is hard, so limescale quietly shortens the life of elements and mixers from Streatham to Waterloo — worth factoring into every cylinder and shower decision. Where scale is a factor, protection on the boiler's cold supply and properly inhibited system water do more for the appliance's lifespan than any brand choice on the quote — and our engineers will say so.
Frequently asked questions
How much is a new boiler in Lambeth?
Most Lambeth 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.
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.
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.
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.