Flue Height and Draught Checker
Enter your appliance output, flue diameter and total flue height to get a quick summary of your figures before your HETAS surveyor visit. This tool checks that your entries are sensible and lists the specific questions you should ask your installer or surveyor.
Data notice: The specific numeric draught and height tables set out in BS EN 15287
are not yet loaded into this tool, so it cannot give you a pass or fail verdict against those
thresholds. What it will do is check your entries for sensible ranges, summarise them clearly,
and tell you which points to raise with your HETAS surveyor so that check can be done properly
on site.