A gas boiler replacement costs around £3,500 including VAT, according to a 2026 government estimate for England and Wales. The median cost of a grant-supported air-to-water heat pump was £12,826 before the grant in England and Wales from July to September 2026. Boiler Upgrade Scheme statistics, Table Q1.1A
A first-time central heating installation also involves fitting the pipework and radiators that distribute heat around your home. GOV.UK central heating guidance This guide compares the three jobs, explains how grants affect heat pump costs and shows what to check in an installer’s quote.
Disclaimer and How We Sourced the Costs
The figures in this guide come from government cost modelling, recorded Boiler Upgrade Scheme costs and Energy Saving Trust estimates. Each figure covers a specific job, area or reporting period. For a price for your home, ask for an itemised installer quote showing what’s included and whether VAT applies.
The Three Jobs People Mean by “Central Heating Installation”
Boiler replacement. You swap the boiler in an existing system. A direct swap can keep the existing radiators and pipework. Government heating installation study, Table 2
First-time central heating. You fit a heat source and the equipment that distributes heat, such as new radiators and pipework. GOV.UK guidance, section 3.1
Heat pump installation. The job can include fitting larger radiators or adding a hot-water cylinder to an existing system. Energy Saving Trust installation guide
What Official Data Shows About Central Heating Installation Costs
Boiler Replacement Costs
The Department for Energy Security and Net Zero (DESNZ) estimated about £3,500 including VAT for a gas boiler in its 2026 business case, using housing stock data for England and Wales. Use it as a boiler replacement benchmark when comparing quotes for the same work. DESNZ Boiler Upgrade Scheme business case, footnote 8
First-Time Central Heating Installation Costs
A 2026 government impact assessment for England and Wales used £6,200 in 2020 prices to model a first-time gas central heating installation with a 24 kW boiler. Treat this as a historical modelling figure. The assessment accounts for extra work such as new radiators, piping and labour.
Central Heating Installation Costs by Fuel Type
Gas Central Heating
If your home needs a new mains gas connection, get a separate price for that work. Ask your local gas network operator for a connection quote.
How Much Does a New Oil Boiler Cost?
Energy Saving Trust estimates £3,200 in Northern Ireland to replace a G-rated oil boiler with an A-rated model and fit thermostatic radiator valves. Energy Saving Trust boiler replacement figures
Ask your installer to check whether your existing oil tank can stay, as its condition can affect the work needed. Ofgem oil tank guidance
Electric Heating
DESNZ modelled an electric combi boiler installation at £5,000 in 2024 prices for a semi-detached home on the gas grid in Great Britain. The estimate includes the appliance, fitting and any applicable ancillary costs. DESNZ clean heating consultation, Table 1
How Much Does a Heat Pump Cost?
Energy Saving Trust puts a typical air-to-water heat pump installation at around £12,000. The price depends on factors such as the size of the system and whether your radiators need upgrading. Energy Saving Trust installation costs
Air-to-Water Heat Pump Installation Costs
The middle half of grant-supported installations in England and Wales cost £10,717 to £15,461 before the grant from July to September 2026. The median was £12,826. DESNZ Boiler Upgrade Scheme statistics, Table Q1.1A
Ground Source Heat Pump Installation Costs
The median cost before the grant for grant-supported ground source installations was £34,630 in England and Wales from July to September 2026. The median across the previous financial year, 2025–26, was £26,500. DESNZ Boiler Upgrade Scheme statistics, Tables Q1.1A and A1.3A
The work can involve digging trenches or drilling boreholes for the ground pipes. Energy Saving Trust ground source heat pump guidance
Heat Pump Grants and Costs After Funding
The Boiler Upgrade Scheme covers eligible properties in England and Wales. GOV.UK scheme overview An installer certified by the Microgeneration Certification Scheme (MCS) applies on your behalf and shows the grant as an upfront discount. Ofgem guidance for property owners
Standard Boiler Upgrade Scheme Grants
The standard grant is £7,500 for an eligible air-to-water or ground source heat pump and £2,500 for an eligible air-to-air heat pump. GOV.UK grant amounts
For example, a quote matching the £12,826 air-to-water median would leave £5,326 to pay after the standard £7,500 grant.
Additional Support for Eligible Oil and LPG Homes
Until 31 March 2027, eligible homes heated by oil or LPG without a mains gas connection can receive an extra £1,500 for an air-to-water or ground source heat pump. GOV.UK uplift criteria That brings the total grant to £9,000. Ofgem grant amount and deadline
On the same £12,826 example quote, the £9,000 grant would leave £3,826 to pay.
What Affects Central Heating Installation Costs?
The price depends on what needs removing, what you can reuse and how much work it takes to fit the new system. A boiler swap and a job that includes new radiators, pipes and controls have different costs. Government heating installation cost study, Table 2
Removing the Old Heating System
Ask the installer to list what they’ll disconnect, remove and take away. If you’re switching to a heat pump, that could include an old gas or oil boiler or electric storage heaters. Confirm whether removal and disposal are included in the price. Newcastle City Council’s heat pump installation guide · GOV.UK guidance on checking what your quote covers
Equipment, Radiators and Pipework
Check the appliance model and output, how many radiators are included and which pipes can stay. A heat pump may need larger radiators or replacement pipework if the existing pipes are too narrow to carry enough water. Energy Saving Trust’s heat pump installation guide
If you’re unsure which parts the installer is referring to, see how your home heating system works.
Labour, Access and Location
Moving a boiler can add pipework and fitting time. A full installation may also involve lifting floorboards or drilling holes for new pipes. Ask who will put the flooring back and repair any holes after the work. British Gas boiler installation guide · Oxford City Council’s installation guide
What Should a Central Heating Installation Quote Include?
Get an itemised written quote after a home survey. Ask three installers to price the same work so you can compare what’s included and what you’ll pay. GOV.UK guidance on comparing quotes
Appliance — make, model, output in kW and proposed location. British Gas fitting guide
Radiators and pipework — what stays, what needs replacing and where new pipes will run. Energy Saving Trust installation guide
Heating controls — the thermostat, programmer or smart heating controls included. Worcester Bosch quote guidance
Removal and disposal — what the installer will disconnect and take away. GOV.UK guidance on agreeing the scope
Additional work — any electrical work and repairs to walls or flooring. Energy Saving Trust on plumbing and wiring · Oxford City Council on making good
System cleaning and testing — any central heating flush and the checks before handover. Energy Saving Trust on testing the system
Price breakdown — equipment and labour priced separately, VAT where applicable and any grant deduction shown clearly. GOV.UK quote guidance
Payment terms — the deposit, balance and due dates. GOV.UK deposit guidance
Dates — when work can start and how long the installer expects it to take. GOV.UK guidance on comparing installation timescales
For a walkthrough, watch British Gas’s guide to getting a new boiler.
How Long Does Central Heating Installation Take and When Should You Book?
Like-for-like boiler swap: A straightforward replacement can take one working day. British Gas boiler installation guide
Full central heating installation: Allow for several working days. Renfrewshire Council allows about two days for its full-system replacements, while Oxford City Council says its installations usually take around five. Ask your installer for a schedule after the survey. Renfrewshire Council timings · Oxford City Council timings
Air-to-water heat pump: The fitting itself typically takes around three days. Extensive pipework, radiator changes or underfloor heating can take longer. Energy Saving Trust installation timings
Track Your Heating Costs With EnergieBee
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If your boiler still works and you’re planning a replacement, consider booking for summer, when you’re less likely to need the heating during the work. For a heat pump, start gathering quotes early and ask how long you’ll be without heating or hot water. British Gas on when to replace a boiler · Energy Saving Trust on preparing for installation
Track Your Heating Costs With EnergieBee
Once your new heating is running, use EnergieBee’s energy dashboard to see your home’s electricity use and costs over time. If you’ve installed a heat pump, compare weeks with similar outdoor temperatures and check whether your electricity tariff changed. Both can affect what you pay. Energy Saving Trust’s guide to heat pump running costs
For practical tips on heating schedules and radiator settings, read our guide to saving money on heating.
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Frequently Asked Questions
How Much Does a Boiler Repair Cost?
The price depends on the fault, the parts needed and what the repair quote covers. Before paying for a repair, check whether your boiler is still under warranty and contact the manufacturer if it is. If you need a paid repair, ask whether the quote is fixed and whether it includes the call-out, parts and labour. Ideal Heating warranty guidance · Worcester Bosch repair terms · British Gas fixed-price repair terms
Can I Install Central Heating Myself?
If the job involves a gas boiler, a Gas Safe registered engineer qualified for the work must fit it and make the final connections. A plumber who isn’t Gas Safe registered can fit water pipes and radiators, but the registered engineer must connect them to the gas boiler. HSE guidance on who can do gas work · HSENI guidance on gas appliances
If you’re applying for a heat pump grant under the Boiler Upgrade Scheme, use an MCS-certified installer. They apply on your behalf. GOV.UK grant application guidance
What Documents Should I Receive After a Gas Boiler Installation?
Ask for the boiler manual, the completed Benchmark commissioning checklist and confirmation of who is registering the manufacturer’s warranty. Benchmark commissioning guidance · Ideal Heating warranty registration guidance
In England and Wales, you should also receive a Building Regulations Compliance Certificate after the installation is notified through Gas Safe Register. If it doesn’t arrive, ask your installer to confirm they’ve notified the work. Gas Safe Register guidance on notification and certificates
How Do Central Air, AC and Steam Boilers Differ From UK Central Heating?
In US home listings, central air usually means central air conditioning. It cools rooms by sending air through ducts. A steam boiler sends steam through pipes to radiators. UK wet central heating circulates hot water from a boiler or heat pump through radiators or underfloor pipes. US Department of Energy on central air conditioning · US Department of Energy on steam heating · Energy Saving Trust on UK heating systems
David Price