Replace the component(s) that blew.
A good portion of the price of a new TM is the design, which you've already paid for. If you have a well-engineered machine, like a PowerClean, (which uses off-the shelf, non-propriatory components), just replace the components.
If the van exploded and the machine were totaled today, I'd look for a good deal on a used, like-new, Genesis or Thermalwave while I shopped for a new PowerClean.