Short answer
A modern gas boiler typically lasts around 10 to 15 years, and a well-installed, yearly serviced boiler on a clean system can last longer. Lifespan is shortened by missed services, sludge in the system, hard water scale and poor installation. Once parts become hard to get or faults keep recurring, replacement usually becomes the sensible option.
What helps a boiler last
- A yearly service. Catches worn parts early and keeps most manufacturer warranties valid. See boiler servicing, from £90 + VAT.
- A clean system. A magnetic filter and inhibitor protect the heat exchanger from sludge.
- Correct set-up. Sensible flow temperatures and controls reduce wear from short cycling.
- Prompt repairs. Small leaks and pressure loss cause bigger damage if ignored. See boiler repairs.
Repair or replace?
We test before we replace parts and tell you the repair cost first. If the boiler is old, parts are scarce or the same fault keeps returning, we will say so and quote for both options. Our boiler repair FAQs and new boiler page explain the choices. New boilers start from £1,750 inc VAT, subject to a site inspection.
Related questions
How long does a boiler last?
A modern gas boiler typically lasts around 10 to 15 years, and a well-installed, yearly serviced boiler on a clean system can last longer. Lifespan is shortened by missed services, sludge in the system, hard water scale and poor installation. Once parts become hard to get or faults keep recurring, replacement usually becomes the sensible option.
What are the signs a boiler needs replacing?
Common signs are repeat breakdowns, parts that are discontinued or slow to source, rising repair bills, persistent pressure loss or leaks from the boiler itself, and a heat exchanger damaged by sludge or scale. Age alone is not a reason. A Gas Safe engineer can tell you whether a repair is still sensible.
Does an annual service make a boiler last longer?
Yes, in most cases. A yearly service checks combustion, cleans key parts, checks the flue and spots wear before it causes a breakdown. It also keeps most manufacturer warranties valid. CombiCert boiler services start from £90 + VAT, and we record the readings so you have a history for the boiler.
Is it worth repairing an old boiler?
It can be, if the fault is a single part that is still available at a fair price and the boiler is otherwise sound. It is less worthwhile when faults keep returning or the heat exchanger is failing. We give you the repair price first, from £90 + VAT for the visit and diagnosis.
Want an engineer to look at it?
Call or WhatsApp 07393 220694, Monday to Saturday, 08:00 to 19:45. CombiCert Ltd is Gas Safe registered (621146) and based in Telford, Shropshire.