does oil boilers need a chimney or can i vent it?
A chimney is a vent, do you mean a metal vent pipe?
Many modern oil boilers can be installed in the balanced flue type design, however the position of the flue must be in a position as not to cause a nuisance to your neighbours or the public if near to an open area. A terminal guard will be required if at low level ( less than 2 mts. from the ground ) Look at the manufactures literature for more information.
