Is there by any chance an inline water filter at the sink that could be reducing the flow or pressure.
I have tankless hot water in the sticks and bricks and I know that sometimes a mineral buildup in the shower heads reduces the flow enough that the hot water heater will not ignite.
I would try hooking an air compressor set at 50 PSI to the city water connection and blowing out all of the lines and to also determine if there is a drastic pressure drop at the fixtures.
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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