I'm offering a Ruffneck FX4 Explosion-Proof Electric Heater with a liquid-to-air heat exchanger. Perfect for your garage, shop, farm, trailer or any sensitive area where you need serious, reliable heat Built like a tank, built in Calgary. Efficient, powerful, quiet, and extremely safe SPECS: In With Images Save thousands over new. Will be the last heater you ever buy! This heater is in excellent shape and has been well-maintained.