As above.
Part of the procedure when firing a bolier is to do a water column/gauge check to verify if both the water and the steam port is clear. If one is blocked you will get false water level readings. You cannot do this if there is no drain cock at the bottom. But I have seen that some of the very small boilers do not have one but not reccommended. Also depends on where you are going to operate it. At home or in public. If public you may need to check with a club boiler inspector.
Paul
Edited By Paul Lousick on 07/02/2019 07:46:58