I have a temperature difference problem bett. My kitchen sink and my faucet in my bathtub. My kitchen and bathroom are on the same floor about 10 feet away from each other. My house was built in 1982 and retains almost all the original fresh water lines. My hot water tank ( 40 G) is about 5 years old. It is electric. Both the kitchen faucet and the tub faucet have been replaced with in the last 10 years. The temp. at the kitchen faucet is 123 degrees. The temp. at the tub faucet is 110 degrees. The kitchen temp. is almost exactly where I've preferred it but the tub,being a steel/porcelain is too cool. HELP! Thanks!!