Typically, the hot water in an RV is very hot compared to say your home hot water. This is by design. If it is TOO hot the hot water tank over pressure valve will open to vent the excess pressure. This is normal. A normal function of the hot water tank is to vent through the over pressure valve so one may see water coming out of the valve from time to time. This is normal. Having really hot water is a good thing most of the time in an RV!