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I assume you are talking about a propane tankless water heater?
I am factory trained and certified by Bosch, Navien, Rinnai, Noritz, and Takaghi. For installation and service. I can saw that I see the least trouble with the New Bosch condensing units. The C-1050 would work very well for you, however I would find away to install it indoors.
After getting it installed adjust the fan speed for your elevation
Any other questions?