The burner itself consists of several different sub-assemblies. There is a frame that everything bolts on to, a motor, fan, pump, pump coupling, nozzle assembly, and it may have a transformer on it and a few other pieces that will never fail unless physically abused. The only thing that will hurt the frame is a sledge hammer and it is doubtful all those other pieces could fail together. The pump would be the pricey piece, MAYBE $200 bucks, everything else mentioned would be well under $100 except the motor which would be in that neighborhood and all of these items would take just minutes to install. As mentioned, you can usually pick up a good used burner for $20-100 from craigslist, flyers, etc.