outdoor wood furnaces high efficiency furnace corn burning stove OUTDOOR WOOD FURNACES We take pride in our quality workmanship in manufacturing the best furnaces for our customers. Pro-Fab Industries has been manufacturing high quality furnaces for over a decade. The Empyre outdoor wood furnaces continue to become a household name, designed in cold climates for cold climates. The Empyre can be counted on for quality, reliability, and savings. Empyre outdoor wood furnaces can heat a swimming pool using a water-to-water heat exchanger. This is the most cost effective way to heat a pool.