The UK remains one of Europe’s biggest boiler markets, but the industry is changing rapidly. Most British homes are still heated by a gas boiler and wet‑based central‑heating system, yet a combination of net‑zero policies, rising fuel prices and alternative technologies such as heat pumps is starting to reshape the market. This article brings together the latest official data and credible industry reports (updated to mid‑2025) to help homeowners and professionals understand how boilers are used in Britain today, what they cost and where the market is heading.

How many boilers are in use?

  • Gas grid dominance – The Committee on Climate Change (CCC) estimates that about 85 % of UK homes – roughly 23 million properties – are connected to the gas grid and use a boiler and wet‑based central‑heating system theccc.org.uk. Around 4 million homes lie off the grid and use oil, LPG or electric heating theccc.org.uk.

     

  • Homes heated with boilers – A recent industry review from GreenMatch notes that around 90 % of UK homes still rely on a boiler system for heating and hot water greenmatch.co.uk, emphasising the continued dominance of boilers despite strong policy support for heat pumps.

     

  • Dominant boiler type – Combination (combi) boilers are by far the most popular design; they deliver hot water on demand and remove the need for separate cylinders or tanks. The Heating and Hot Water Industry Council (HHIC) reported that more than 80 % of domestic boilers sold in 2021 were combi models hhic.org.uk. GreenMatch quotes similar figures and notes that combi boilers account for roughly 80 % of all domestic boiler sales greenmatch.co.uk.

     

  • Number of boilers sold – The post‑pandemic bounce in home renovation drove a surge in boiler sales. HHIC reported that from January–April 2021 there were 674,063 domestic gas boilers sold compared with 476,847 over the same period in 2020 – a 41 % increase hhic.org.uk. Sales fell back in 2023; the European Heating Industry (EHI) Heating Market Report 2024 recorded 1,359,300 gas condensing boilers sold in the UK in 2023, contributing to over 1.5 million heating units sold in that year ehi.eu. GreenMatch cites Statista data suggesting that about 1.8 million domestic boilers were sold in 2022 greenmatch.co.uk, illustrating how 2022 was a high‑water mark.

     

  • Gas‑safe workforce – HHIC estimates that around 130,000 Gas Safe registered installers operate in the UK hhic.org.uk. The CITB Construction Skills Network forecasts only a small change in trades numbers between 2022 and 2027 (plumbing & HVAC trades: 118,600 → 118,800; electrical trades: 198,300 → 202,600) citb.co.uk, highlighting the challenge of training enough engineers for the heat‑pump transition.

     

Boiler efficiency, emissions and regulation

  • Energy use and bills – Heating and hot water account for over half of an average household’s annual energy bill, so the efficiency of a boiler has a big impact energysavingtrust.org.uk. Modern condensing boilers capture more heat from flue gases and are more efficient than older models energysavingtrust.org.uk.

     

  • Carbon footprint – Domestic heating makes up roughly 14 % of UK greenhouse‑gas emissions nesta.org.uk. Fossil‑fuel boilers are the main source; the Ofgem Boiler Upgrade Scheme (BUS) report notes that more than 78 % of homes in England and Wales are heated by fossil‑fuel systems ofgem.gov.uk.

     

  • Minimum efficiency standards – From 2025, all newly installed boilers in the UK must have a Seasonal Efficiency (ErP) rating of at least 92 % greenmatch.co.uk. Building Regulations Part L already require modern boilers to be condensing types, and hydrogen‑ready boilers are being trialled with a view to wider rollout from 2030 greenmatch.co.uk.

     

  • Heat‑pump transition and grants – The UK government aims to phase out fossil‑fuel heating in new homes by 2025 and reach 600,000 heat‑pump installations per year by 2028. The BUS provides grants up to £7,500 for air‑source and ground‑source heat‑pump installations. The 2023‑24 BUS annual report shows that by March 2024, nearly 24,000 applicants had received support and that 47.2 % of grants replaced gas boilers while 20.1 % replaced oil boilers ofgem.gov.uk.

     

How much does a new boiler cost?

Boiler costs vary according to type, size and installation complexity. Specialist suppliers such as Heatable and independent consumer guides provide the following ranges:

  • Typical installation cost range – Heatable’s 2025 price guide says a typical new boiler installation costs between £1,500 and £5,500 depending on the type and complexity heatable.co.uk. Their quick summary estimates £2,500–£3,500 as a common range for a straightforward installation heatable.co.uk.

     

  • Detailed breakdown by type – The Eco Experts’ 2025 guide places the average cost of installing a new boiler at about £4,000, but notes that prices vary from £3,800 for a gas combi boiler to £16,000 for a biomass boiler theecoexperts.co.uk. For a typical three‑bedroom house (costs include installation):

     

  • Running costs – Although not directly measured here, switching from an old G‑rated boiler to a new A‑rated condensing boiler can save around £385 per year in energy costs according to Heatable’s estimates heatable.co.uk.

     

Boiler reliability and breakdown statistics

  • Breakdown frequency – Research by boiler‑service firm Fair Fix analysed breakdown data between 2009 and 2019 and found that 5.1 % of boilers failed each decade, equating to about 107,108 breakdowns per year londonlovesproperty.com. England has around 20.8 million households reliant on boilers londonlovesproperty.com.

     

  • Financial impact – With the average repair costing about £300 per boiler, Fair Fix calculates that boiler failures cost households roughly £32.1 million per year londonlovesproperty.com. London has the highest failure rate at 6.1 % (about 18,661 breakdowns a decade), followed closely by the West Midlands (6 %) and the North East (5.6 %) londonlovesproperty.com. Fair Fix notes that modern boilers are generally reliable; breakdowns are often due to poor maintenance londonlovesproperty.com.

     

Policy context and future trends

  • Phase‑out of fossil‑fuel boilers – The UK’s Future Homes Standard will prohibit the installation of gas and oil boilers in new‑build houses from 2025, and the Heat and Buildings Strategy targets the phase‑out of fossil‑fuel boilers in existing homes by the mid‑2030s nesta.org.uk.

     

  • Shift towards heat pumps – Heat‑pump sales are rising quickly; the EHI report records 96,100 hydronic heat pumps sold in 2024, up 31.1 % on 2023 ehi.eu. However, they still account for a small fraction of the heating market; gas boilers are installed at roughly 1.7 million units per year, around 45 times the number of heat pumps greenmatch.co.uk. The BUS report shows that 71.6 % of low‑carbon heating grants replaced fossil‑fuel systems, indicating a gradual shift rather than a sudden switch ofgem.gov.uk.

     

  • Hydrogen‑ready boilers – The UK government is exploring hydrogen as a low‑carbon replacement for natural gas. GreenMatch notes that hydrogen‑ready boilers may be available for mass rollout by 2030 greenmatch.co.uk, though trials are still ongoing.

     

  • Economic considerations – Rising gas and oil prices are expected to encourage homeowners to replace older boilers with more efficient models or switch to heat pumps. Government schemes (BUS, ECO 4) provide grants and obligations to support low‑carbon heating installations theecoexperts.co.uk. However, high installation costs remain a barrier; for example, Ofgem’s BUS report shows that the average quoted cost for an air‑source heat pump including grant value was around £13,811 ofgem.gov.uk, well above the cost of a typical gas boiler.

     

What this means for homeowners and local businesses in Sudbury and Suffolk

For a plumbing, heating and electrics company operating in Sudbury, Suffolk, these statistics offer several insights:

  1. Large installed base but uncertain future – With around 23 million gas boilers in the UK and 20.8 million households still relying on them, demand for boiler servicing and replacement will remain strong in the short‑term. High failure costs (around £32 million per year nationally) underscore the importance of annual servicing londonlovesproperty.com.

     

  2. Demand shifting towards efficiency upgrades – The requirement for 92 % ErP efficiency in new boilers and rising fuel costs mean that customers increasingly seek high‑efficiency models or early replacements. Offering condensing boiler upgrades can help households cut their energy use and emissions.

     

  3. Transition opportunities – Government incentives such as the Boiler Upgrade Scheme provide grants for heat pumps and biomass boilers ofgem.gov.uk. Developing expertise in low‑carbon heating installations will position local firms for future growth as the 2025 new‑build ban on fossil‑fuel boilers approaches.

     

  4. Ongoing training needs – The gradual electrification of heating will require additional skills. The CITB forecasts only modest growth in the workforce citb.co.uk, so investing in staff training (e.g., heat‑pump and hydrogen boiler courses) will be crucial.

     

Conclusion

Boilers remain at the heart of the UK’s heating landscape. Around 90 % of homes still use a boiler greenmatch.co.uk, 23 million systems are connected to the gas grid theccc.org.uk, and combi boilers account for more than 80 % of new sales hhic.org.uk. However, policy measures such as the Future Homes Standard and rising energy prices are accelerating the shift towards heat pumps and other low‑carbon alternatives. For households, choosing a modern A‑rated boiler or adopting a heat pump can deliver significant energy savings. For plumbing and heating businesses, there is an immediate opportunity to service and replace the ageing boiler stock while preparing for a future dominated by high‑efficiency and renewable heating technologies.