Rinnai Tankless Vent Question

I bought this house as a project to remodel the entire thing with the goal of learning and to save money, not to make it. The only reason it has taken me so many years on this remodel is because I have been doing a ton of research to make sure I am doing everything to code and learning the correct way to do things. It drives my wife nuts but when I'm done I'm satisfied. That is the whole reason I am posting here in search of code information. I am a mathematician and pretty detail oriented. I understand that because I live in a cold climate it is recommended to use the condensate trap. I will have one 90 degree elbow leading out of the house and will have it slanted inward towards the house per installation instructions. I am using the Ubbink vent system as recommended.

My single question was how high do I need to be outside? I'm within all specification in terms of distance from soffit, corners, other exhaust, windows, air conditioner, gas meters, etc.

I will look for local references to anticipated snow level but my town isn't really that big and often defers to state, national, or nearby codes of larger cities. And I do understand that most warranties require a licensed installer but do you have any idea how much money I have saved over the years by doing things myself? If I'm capable, the risk vs. reward is a simple decisions. Not meeting code when doing it myself is a deal breaker though as the risk becomes too high for me. I do understand that many people end up getting in over their head and require to be saved by local licensed tradesmen and that there are plenty of stories of how messed up people do things, I'm not that guy!

Thanks again for everyone's input. I'll keep looking.