Because they have fewer components than a traditional furnace or heat pump, a professionally installed and maintained boiler can last upwards of 20 years. There are a number of factors that can decrease the life expectancy of your boiler, including corrosion and inadequate maintenance techniques. If your boiler is over 10 years old and there is visible corrosion or water leakage, or you find yourself spending a fortune on repairs, consider replacing it with a newer, more energy efficient model.