Boiler prices vary based on brand, size and type (combi, system or conventional). As the cold weather hits the country, many are cranking up the. Q how do i know how old my boiler is? Here are a few questions to think about before you have a conversation with your installer. Great tips, recipes & projects delivered to your inbox. Did you find this review helpful? If you're currently without hot water or heating, you can also find out. Our handy calculator makes calculating system.