What is the year make and model of your RV.
If you have a valve system that can isolate each of the individual hot and cold lines to each faucet it may be possible that the hot water valve is not turned on all the way.
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Jim J
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
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