How to insert an obstacle (e.g. a boiler).
Step 1: Chose Insert obstacle.
Step 2: In the floor plan, select the corner of the wall from which you are measuring the obstacle.
Step 3: Measure the distance d1,
Top height (Upper edge of the obstacle to the ground),
Bottom height (Lower edge of the obstacle to the ground)
and the Distance to wall.
Step 4: End the command with OK.