I have a 40 gallon Natural gas US Craftsman. I was looking at the serial number and it begins with 95 so I’m thinking it’s 5 years old, not 1 or 2 like I was led to believe. I was reading about the dip tub settlement, do you think it could be a problem with the dip tube? The low flow shower head…do I just go buy one and replace the current shower head? Thanks for your advice!