Hot zone life depends on several factors including type of construction, type of use (ie. heat treating versus brazing), cleanliness of the load being processed and maintenance. In general heat treating applications, a properly maintained hot zone should last 5 to 7 years. Once worn out, it can sometimes be rebuilt rather than replaced. VAC AERO can re-build and replace hot zones for any brand of vacuum furnace. We also offer preventive maintenance programs to extend the life of your furnace.