Blue-cold
Red-hot
White-recirculation
We have not installed our recerc pump, but the intent is to run the tankless to get hot water at the furthest locations/shower/laundry/spigot so that when you turn on the hot tap, it’s ready. They are sometimes tied in with a switch that activates the pump for whatever Circut is demanding the hot water. At least that is “one” theory behind the three and the reason the white is a smaller ID. Oh yeah, probably the biggest takeaway, is that it saves water by running through the pump rather than running down the drain.
Disclaimer, since I do not have first hand knowledge of this particular job, I am not 100% sure what the reason why they did this. I am only basing my general deduction solely on my personal experience with installing PEX and the three colors I used in our tankless install. BTW, we have the same unit and it kicks arse. Our partially filled propane tank lasted 2 years before filling to 75% insanely efficient buggers.
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