Work a gas boiler engineer can help with
Boiler servicing
Describe what is there now, what you want changed and any photos, so quotes cover the same scope.
Fault diagnosis
Mention the size, access and any deadlines so tradespeople can price the job accurately.
Boiler repairs
Say what finish or standard you expect and whether materials are included.
New boilers
Add anything that could affect the work, such as parking, pets or working hours.