Author: steveng Heater dimensions are 6″ x 4″ x 5 1/8″ (L x W x H) for the small model, and 8″ x 4″ x 5 1/8″ for our medium and large size heaters. Was this answer helpful ? Yes (1) / No (0) How do I install the heater with the quick release bracket? Can the Xtreme Heater plug into a regular wall socket at my house?