How long has it been mandatory to install a fire valve in the fuel line when installing a new boiler to comply with Part J? Now could someone hazard a guess as to roughly how long to do the following. 1 Remove an old oil fired boiler. 2 Replace with a new oil fired boiler 3 Install a 3m remote fire valve 4. Tidy up afterwards. I am asking this as have received a quote for the above work. Now 2 yrs ago I received a quote from the same firm for the exact same job, minus the fire valve, when I was told would be completed in a day. Now it is going to take 3 days!