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Some questions and thoughts.
Why would you limit the ability of the temperature sensor to control pump speed. If the sensor indicated a high temperature that alone should be able to adjust the pump to any speed required.(high temp reading light load)
I find it interesting you are considering load at all. Not saying it's a bad idea. Is this to obtain a more stable temperature? As long at there is sufficient flow to the temperature sensor it should respond indirectly to the load.
One other parameter you may want to add if you use load, load having little or no effect below a specified temperature.
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