The boiler must be serviced each year in line with the manufacturer's instructions the service must be carried out by an engineer registered with gas safe the service can be done up to 60 days before or after the original anniversary of the boiler being installed without invalidating the warranty. Dont just take our word for it click to see our tesimonials. If you’re still interested, check out our. Our broadband unbundled tool finds the cheapest broadband, phone and tv. H any other costs.