Sorry for the delay guys, busy updating the OntarioACHI services. I find it difficult to be in two places at the same time.
You got it almost right Doug. They are ceiling radiant heat panels, there was a class action lawsuit against ThermaWatt. The CSA did get included. The manufacturers re-made the panels and from 1990 the original manufacturer re-issued installation instruction.
From what I can identify, the panels were never actually banned in Ontario, but the risk is still there.
The Electrical panel should actually have a sticker identifying that the radiant panels are installed, and for safety sake, if they are still operational should be connected to an AFCI.
They should never be installed as the sole heat source.
The correct recommendation is, regardless of the manufacture or install date, as always, “Further inspection by a licensed master electrician is recommended”.
Personally I can’t see the point in heating the ceiling. Heat rises, and you would be spending a fortune in electricity heating the insulation which should be laid on top.
Author-edit: Further information
They are difficult to see in an attic because of the fact they are covered by insulation. These were easy to see because the insulation had been removed in this attic because of a fire. Fire wasn’t related to the panels in this case.