My few thoughts:
Placement would be key to effectiveness. As a point of reference it takes 600*f to "light off" the O2 sensors that are not heated. A study using TempiLaq temperature indicating paints may help.
Conduction across multiple metal boundaries will reduce efficiency. If those boundaries are not bonded, but rather only in mechanical contact, then efficiency is further reduced.
System will need to be designed such that steam is vented rather than retained. Simply drawing from the bottom and returning to the top of the storage tank should do this, but experimentation is required to confirm.
Seems possible and reasonable, but Advise caution.
I used to swerve around my hallucinations, now I drive right through them.