Rinnai Tankless REU-V2520-EFU. (4-6 years old) Water isn't as warm as it used to be. Any ideas what might be causing this? Any suggestions on how to remedy it?
I did notice that the installer used a bathroom controller to control the unit, which limits the temperature to 120 degrees (instead of a master controller that allows temps up to 140 degrees.
Thanks in advance,