Chris Bryant wrote:
There are 2 distinct reasons for these to catch fire- basically one is a sudden release of refrigerant *while running on LP*. This is fairly rare, as the largest component of the refrigerant is water, but it can and has caused fires. The more common failure is simple overheating, which will ignite surrounding flammable materials.
There are other reasons they will burn- electrical problems, critters nesting around the burner, etc.
Thank you Chris Bryant. In reading this
The more common failure is simple overheating, which will ignite surrounding flammable materials.
So, I'm thinking it would be worth while to keep an eye on temps around boiler plate and coils.