Customer States: They are running out of hot water too fast. Especially when more than one fixture is used. Tub drain in master bathroom is slow. Technician Notes: Out today to look into potential issue with the water heater and a tub drain. Water heater is a 40 gallon natural gas Rheem manufactured in December of 2022. I tested water heater for any issues. Heat setting was turned all the way up. Hot water flowed from three handle shower valve tub spout for 8 minutes. Higher flow/ GPM valve. No irregularities in the amount of hot water. Tub drain was draining slow due to the push stopper washer being turned upside down. Also measured pressure at 90psi. This is over code. Attempted to adjust PRV, this did not work. High pressure can contribute to running out of hot water faster. Resolution: Set water heater temp to 140, was at 150 upon arrival. This should not be set all the way up. Fixed tub drain by flipping washer. Replaced the Wilkins double union PRV in the garage and set pressur