Looking to replace your boiler and do you want to know if a Baxi boiler is the right choice for you and your home? As a general rule, you should replace your boiler every 10-15 years. When you have an older boiler, you’ll find that your utility bills go up, you have to call a serviceperson out more often, your radiators aren’t quite as warm as you’d like them to be, and the hot water that comes out of your tap just isn’t as hot anymore.