The present invention relates to a plastic cover, preferably made of CPVC plastic, for traditional baseboard heaters. The plastic cover contains a front piece with bulges and a connected perforated top piece with back flanges. The plastic cover is supported by preferably two support brackets which are attached to the wall. The support brackets have top and bottom slots in the back and protruding arms which fit into the bulges of the front piece. The slots of the support brackets hold top and bottom angled slats that direct hot air into a room. The plastic cover is easily attached to the support brackets as the bulges snap into place over the protruding arms of the support bracket and the back flanges of the top cover piece locks onto the top slat held in place by the supporting brackets. Side pieces prevent hot air from escaping and might further include straight or corner connectors to longitudinally extend the plastic cover.