What diameter PEX is most hot water efficient?
This is a follow up to the recent Q&A on tankless water heaters. One suggestion was smaller diameter pipe. I’ll be doing a PEX home run system and was thinking of 3/8 tube for all the hot fixtures. We are currently using a 1.6 gpm shower head and are happy with it so I’d think 3/8 should work for the shower and sinks but will this be enough to supply a dishwasher, fill a bath tub?
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