NK Gas Service & Repairs
How many UK homes run on gas, how long boilers last, how much old boilers waste, and the human cost of faulty appliances — the key numbers, with their sources.
The gas boiler is at the heart of the typical British home, yet most people know very little about the appliance heating their house. We have pulled together the key UK boiler statistics for 2026 — sourced from bodies including the Climate Change Committee, the English Housing Survey and UK health data — so homeowners, journalists and landlords have the headline numbers in one place. Feel free to cite any of these figures with a link back to this page.
Gas is by far the dominant way Britain heats its homes. According to figures from the Climate Change Committee, around 85% of UK homes — roughly 23 million properties — are connected to the gas grid and heated by a gas boiler and wet central heating system.
That makes the humble gas boiler one of the most widespread pieces of equipment in the country, and it is why boiler breakdowns spike into a genuine national issue every winter.
Around eight in ten UK homes with gas heating use a combi (combination) boiler, which provides heating and hot water on demand without a separate hot water cylinder. Their compact size and efficiency have made them the default choice in new installations and replacements across the West Midlands and the rest of the country.
The average gas boiler lasts around 10 to 15 years. The single biggest factor in reaching — or beating — that range is maintenance. A boiler that is serviced every year and kept at the right pressure will typically outlast one that is ignored until it breaks.
That is the practical case for an annual boiler service: it catches small faults early, keeps the manufacturer's warranty valid, and protects the several-thousand-pound investment a boiler represents.
Efficiency has improved dramatically. An old non-condensing boiler may be only around 60-70% efficient, meaning up to a third of the gas it burns is effectively wasted. A modern A-rated condensing boiler is typically over 90% efficient.
For a household still running a 15-year-old boiler, that gap shows up directly on the energy bill — one reason many homeowners choose to replace an ageing unit rather than keep repairing it. Our boiler service cost guide and boiler installation service can help you weigh up repair versus replacement.
Boiler statistics are not just about money — they are about safety. Faulty gas appliances can leak carbon monoxide, an odourless gas. UK government and health estimates put accidental carbon monoxide poisoning at around 40 deaths and roughly 4,000 A&E visits in England every year, with cases rising in the colder months.
Almost all of this is preventable through annual servicing by a Gas Safe registered engineer and a working CO alarm. Our carbon monoxide safety guide explains how to protect your home.
With most West Midlands homes on gas, and a large share of the local housing stock built decades ago, this region has plenty of older boilers working hard through the winter. The takeaways are simple: service your boiler yearly, fit a carbon monoxide alarm, and don't ignore early warning signs like a boiler losing pressure or one that keeps cutting out. A little maintenance goes a long way.
Sources: Gas grid connection and boiler numbers — Climate Change Committee; home heating and boiler types — English Housing Survey; carbon monoxide figures — UK government and NHS estimates. Figures are rounded and intended as a general reference.
A yearly service keeps your boiler safe, efficient and under warranty. Covering Wolverhampton, Walsall, Cannock and the West Midlands, 7 days a week. Gas Safe #568305.