If you are looking for shop heat, consider a Modine Hot Dawg or a Reznor UDAP heater. I think you can buy the Hot Dawg heater at Mills Fleet Farm for about $400. Also the venting will add to the cost too. In the end instead of just a convection wall heater you get a heater hanging from the ceiling, out of the way, with a fan to help circulate the air. It depends on how big of shop you are heating as to the size of heater, of course! Greg