The answer to 'when to replace boiler' is that you should typically replace your boiler every 15-20 years, or sooner if it's no longer operating efficiently or reliably. Boilers are major home appliances that wear down over time, and older models tend to become less energy-efficient, more prone to breakdowns, and more expensive to maintain.
Some key signs it may be time to replace your boiler include frequent repairs, inconsistent heating, strange noises, and higher energy bills. Upgrading to a newer, high-efficiency boiler can save you money on utilities and provide more reliable comfort in your home.