Okay. Had a guy over here and it is definitely NOT the mixing valve. We did a temperature test and the hot water out of the boiler dropped off after a minute or two of running the hot water.
So..its the coil for sure.
Thinking of bypassing this oil-fired domestic hot water system all together since it runs 365/24/7. It's looking like a propane tankless on-demand system will cost me about as much as installing an indirect oil-fired 40 gallon system. Definitely not going the electric hot water heater route.
Having a very educational experience with this issue and interesting to hear what has happened with others.
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