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Old 11-21-15, 11:01 AM   #13
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That valve there is the i/c standard, wholesale, ultra common, generic replacement part from Parker. It will dismantle and can swap guts with many other valves in the line. With the "c charge" powerhead on it, the bottom of its control range is about 0 degF. It will work awesome for a water-based hx.

The measurement method you propose will work well if your vessel is highly insulated. Otherwise, with a half ton of capacity, too much heat will conduct directly out of the vessel and too much water will evaporate (if open container) to force anywhere near an accurate temperature change. I used a 75 gallon fish tank to heat a few rooms this way with a repurposed dehumidifier.
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