Remodel and 3/4 supply line

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wff68197

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In the process of a large home remodel. Starting to re-plumb the master bedroom side converting most of the existing copper to PEX-A. Once I got into walls and traced copper lines I'm concerned about flow/pressure issues and hoping for advice. Currently in the master bath there is a 3/4 cold supply coming up through the slab that acted as the supply for the cold side of the master tub, shower, 2 vanity sinks and a hose bib. It continued on to supply the cold water input to 2 40 gallon hot water heaters in parallel in the attic that then fed the hot side of the master tub, shower, 2 vanity sinks, and the hot side of another tub/shower and vanity. So the single 3/4 line coming through slab was feeding at least 11 outputs.
My plan was to replace the 2 hot water heaters with a single tankless and trying to determine if I need to try and find another main line to feed it from? Or should I not worry about it and will the single 3/4 line be sufficient to run a large master shower (2 heads) as well as a second shower at same time? I dont have the GPM ratings of faucets or shower heads yet, and dont have water pressure readings, so just looking for general advice or am I overthinking possible issue of overrunning the 3/4 line capacity?
 

John Gayewski

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Definitely 1 inch I would decide if you want tio use two depending on the pressure and how much pipe there is along with other fixtures. It all kind of goes together.
 

Jeff H Young

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Totally agree with above, 3/4 line picking all that up plus all the hot It will work and it might work ok but might be noticeable not desirable or code
 
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