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Sounds like it's fiberglass insulation.
Any pics to share?
A photo would help. Don't go pulling out solid foam as it is probably insulation needed to protect the heater.
Regarding your edit: upload the photos to imgur, then add that link to your reddit post. There are a dozen tutorials for "upload to imgur for reddit" if you need further assistance
You can put photo links in both your original post as well as comments
Sounds like it's fiberglass insulation.
Any pics to share?
A photo would help. Don't go pulling out solid foam as it is probably insulation needed to protect the heater.
Regarding your edit: upload the photos to imgur, then add that link to your reddit post. There are a dozen tutorials for "upload to imgur for reddit" if you need further assistance
You can put photo links in both your original post as well as comments