5 Signs You Need a New Boiler

Your boiler is the hardest-working appliance in your home, especially during winter. But how do you know when it's time to replace it rather than repair it? Here are five clear warning signs.

1. It's Over 10-15 Years Old

Modern boilers are built to last around 10-15 years. If yours is older, it's likely running inefficiently and costing you more in energy bills. Even if it still works, a new A-rated condensing boiler could cut your heating costs by up to 30%.

Check the manufacturer's label — if the model is discontinued and parts are hard to find, replacement makes more sense than repeated repairs.

2. Your Energy Bills Are Climbing

If your bills are rising but your usage hasn't changed, your boiler is likely losing efficiency. Older boilers waste energy, and the cost of running an inefficient boiler often exceeds the cost of installing a new one over a few years.

3. Frequent Breakdowns and Repairs

If you're calling out a Gas Safe engineer multiple times a year, those repair bills add up fast. As a rule of thumb: if the cost of repairs exceeds 50% of a new boiler's price, replacement is the smarter choice.

4. Strange Noises (Banging, Whistling, Gurgling)

Some noise is normal, but loud banging (kettling), persistent whistling, or gurgling sounds indicate serious issues like limescale buildup, air in the system, or a failing pump. While these can sometimes be fixed, they're often symptoms of a boiler nearing the end of its life.

5. Inconsistent Heating or Hot Water

If radiators are cold, hot water runs out quickly, or some rooms never warm up properly, your boiler may be struggling to meet demand. This is common in older systems that weren't sized correctly or are simply worn out.

What to Do Next

If two or more of these signs apply, get a Gas Safe registered engineer to assess your boiler. They can advise whether a repair will suffice or if replacement is the better long-term investment.

Need a boiler repair or replacement? Find qualified Gas Safe engineers in your area through TradeHub — all vetted, reviewed, and ready to help.