I have a Navien NPE-240A tankless hot water heater delivering hot water throughout the house. All of a sudden, I am only getting luke warm water at each of the showers (which have a single mixing valve for hot and cold). However, I get piping hot water at sinks and the master bath (which all have individual hot and cold faucets).
My first thought was the cartridge in the shower valve was restricting the flow of hot water. I was going to replace the cartridge, but this is happening at all...
Tankless Water Heater not delivering hot water to showers
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