I don’t heat my house with waste office paper. I had been using 2 sheets to start the updraft, then one sheet to catch the kindling. But most office paper that comes in the mail now just smolders. I think it is some flame retardant in the paper. Who knows.
When I collect a lot I just burn it in a pit in the back yard. I have to have a good hot wood fire or it doesn’t burn well there either.
I don’t heat my house with waste office paper.