I bought two ceramic heaters from Walmart about 20 years ago. Both have the same issue which the plugs have burn marks after using them for 6 months. Obviously, this is a dangerous issue since it can catch the house on fire. Last year, I threw one out already. I was checking the second one this morning and after carefully inspecting the cord, there are burn marks at the plug. I am about to throw it out. Is there anything internal that I can salvage? Before I throw it out, I am curious how the unit works so I am planning to take it apart just to learn about it. Any thoughts?

Looking at either the 45 HDS (modine hot dawg 45 k btu) or a 40k Goodman furnace (80%). The unit heater has seperated combustion, but the furnace will be in its own space, with clean make up air. The unit heater may interfere with my gantry crane a little bit. The furnace can be ducted to heat both sides of garage (wall down the middle separating garage from my shop area). They cost about the same to purchase. What do you all think?