We just installed a new large tub. Realize that we our 50 gallon Hot water heater is not providing enough hot water. HWH is new so not looking to replace. Plumber recommended Sharkbite Tank Booster, which is basically a mixing valve that is attacehed atop the water heater. Water is then stored at 140-150 degrees and cold water is mixed in, thus creating more water at 110-120 degrees. Have you heard of this and is it effective?