What document is required as a service record for a combination boiler?

The Benchmark Log is the correct choice because it serves as an important document that officially records details about the installation and servicing of combination boilers. This log is particularly significant for the safe and effective operation of a boiler, as it provides clear evidence that the appliance has been properly installed and maintained according to the manufacturer's guidelines.

The Benchmark Log includes information such as the installer’s details, the installation date, and a checklist confirming that the boiler was installed in compliance with relevant regulations and best practices. It also includes periodic service entries, which are vital for tracking the ongoing maintenance and safety checks of the appliance throughout its lifecycle.

This document is often required by insurance companies and safety inspectors to ensure that the boiler has been adequately serviced, which is crucial for maintaining its efficiency and safety standards over time. This necessity for documented evidence makes the Benchmark Log an essential part of servicing boiler systems, ensuring compliance with legal and safety obligations.