This is going to be a nice install. I must say that if you had issues with mod/con boilers at altitude, you didn't pick the right boiler. Unfortunately, the US made boilers don't have the combustion side of things figured out as well as the Germans do.
On the HP, I would keep a thermostatic valve on the input from any solar assist to the heat pump set at about 20C (72F) to keep the head pressure stable, just in case.
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