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I have a Atwood 8525 II furnace and doesn't heat good. I have a (Like new) assembly (igniter, valve, orifice and burner etc) from a 8535 II. anybody know if i could exchange the 25 to the 35 as it looks the same and everything. Only diff i can see is the orifice is for 35,000 btu and the other is for a 25,000. The heat chamber even looks the same. We tried it and it fits and bolts in etc but didn't dare to try it without asking someone. Thanks for any help i can get. Rick