Having both the outside faucets open can let the cold water bleed to the hot water side (and dilute the temperature). Depending on where that happens in your schematic, that could explain why it is hot in one room and not the other.
-Angus
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Joan & Angus Campbell
Winters in Las Cruces, NM, traveling the rest
2019 Pinnacle 36SSWS "Diana"
2019 F350 DRW Lariat CC Long Bed Diesel "Sheila"
3 Chihuahuas and 4 cats
We don't camp, we don't glamp, we LIVE.
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