Measuring Your Floor Area
Simply measure the wall lengths of your room.
Nothing elaborate is required, but our preference is for the dimensions to be metric. Show the position of any heavy permanently sited wall units, bookcases chests etc. that are not on legs.
These would prevent the heat from dispersing and make the system less economical.
Make sure that you mark on the sketch the position of the electric supply point so we can ensure the wiring will terminate at this point.