Chris. It sounds like your cold water inlet dip-tube is broken off short. Replace it and you'll see a difference. Just for the record: You will never get 50 gal's of hot water out of a 50 gal tank water heater, It's more like 35 gal's. The only way you'll ever get 50 gal's of cold in and 50 gal's of hot out, is with a tankless water heater. E-mail me & I'll send you info, or call me at 800 851 9891. Regards, Brian Wood.