The age of your boiler does make a difference when it comes to taking out boiler cover. This is because most insurance providers will have a limit on how old your boiler can be for you to automatically qualify for boiler insurance, and this limit tends to be around seven years.
Should you have an older boiler in your rental home, it may be worth looking into getting a new boiler installed. They are better for the environment and more energy efficient. Plus, they are much less likely to fail to Gas Safe tests that are required each year.
Furthermore, as green energy solutions have become an important part of modern life, you may find it much easier to get tenants in if your home has a higher green rating.