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Water Heater & Mixing Valve controls
Our building has a Turbomax Instantaneous Indirect Water Heater that is tied into a hot water loop with our steam boiler. The cold water goes into the tank and comes out hot, and then through a mixing valve with a cold line before heating to apartments - I assume this is to regulate the hot water.
Now the Aquastat on the Water Heater is set to 125F. Is there any reason it should be higher?
My question is whether to tinker with the aquastat or adjust the mixing valve to get the appropriate hot water temperature. It seems boiler techs will come and turn the aquastat up or down which might have been because the mixing valve is faulty and they're trying to compensate? I see there's a temperature gauge right after the mixing valve - so I assume I want to make sure that temp is always above 120F. Which then I could either raise the Aquastat on the water heater or adjust the mixing valve to let less cold water in? Does this sound correct?