Yeah, usually your furnace should be in the ballpark of 45,000-70,000, while a water heater... could be whatever you want really. I've seen 50 gallon models with 100,000 input. A tankless could be 200,000 or more. In that case generally the clearance will be 3 ft minimum, but it'll have to be double-checked against the manufacturer's instructions; it may be more.
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