We have a Ruud Pacemaker,model PE52-2 C 50 gal unit. It was installed into a newly built house we moved into in May 2002. Just two weeks ago we could only get a half tub of hot water vs. 2+ tubs before. Also, what water we did get was REALLY hot! We adjusted by waiting about 15-20 min to repeat the process for next user. Later, I turned both thermostats up to cut down wait time, but I'm sure we're using much more electricity now to heat up same amount of water. What gives?