TL;DR – Boiler Warranties: What You Need to KnowBoiler warranties aren’t all the same—coverage varies and often excludes common issues like sludge or poor installation. To keep your warranty valid, your boiler must be: Installed by a Gas Safe registered and ideally manufacturer-accredited engineer Registered with the manufacturer within 30 days Serviced annually, with proof kept on file Warranties can be voided by missed servicing, DIY repairs, or lack of system protection. Many homeowners ...