Here are the BTU possibilities from my owners manual, Atwood Hydro Flame 8500 IV LD series furnace. Problem is I have no clue what my model # is. But 30,000 dose sound familiar as to the BTU rating but not for sure.
8516- IV 16,000
8520-IV 20,000
8525-IV 25,000
8531-IV 30,000
8538 -IV 35,000
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