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Thanks for the replies, somehow they did not hit my inbox hence my late response. I did use an IR thermometer on the output pipe at the unit but it was nowhere in ballpark. For the faucet temp, I used a kitchen thermometer in a cup while running the hot water. I am pretty confident that the unit...

I've recently been getting tepid water at my faucet. Navien NPE-240A about 8 years old. I tried cleaning the air filter, water inlet filter, and condenser drain. Descaled for 30 mins. No change. Then I started changing the set temp and recorded the output temp the heater reports vs. the temp at...