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Dug a little deeper and discovered that they are, in fact, the same. ADP makes these for themselves, Lennox and Armstrong(which is owned by lennox). Same heaters, different stickers. That's right...

Currently using Lennox LF24 200 unit heaters with propane and i like them so I bought a couple of used Armstrong UHPA200AE-3 units but they're on Nat. I could swear these are the same heaters but I'm...