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Old 08-17-2019, 02:18 PM   #12
Bacchus
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City: Seneca Lake NY
Vessel Name: Bacchus
Vessel Model: MS 34 HT Trawler
Join Date: Nov 2014
Posts: 7,828
Do you have a shower with a shut off at the spray head?
If you do and shut off at the sprayer and not at the temp control valve you can get cross feed of hot to cold piping.
Common occurrence on RVs with an outdoor shower.
Otherwise I agree best to follow and diagram your piping to understand possible causes.
Is this something new? Always been that way? Or boat new to you?
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2008 MS 34 HT Trawler
"Bacchus"
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