Guys, if I put my PID thermometer in the water out valve of my recirculating eherms system, why do I need a dial thermometer in the side of the HLT? Seems redundant and would save me $20.
Thanks
Scott
There's something to be said for being able to know the HLT temp when it isn't recirculating (initial heating cycle, etc). A sensor outside the HLT is going to see water that is probably cooling. I'll be using a temp sensor/PID looking at the HLT during initial heating and another sensor/PID looking at recirc water during recirc, with the appropriate one controlling the HLT burner at a given time).
If it is not recirculating, then which temperature are you taking? Stratification....
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