I'm not sure exactly what you mean, but I never thought of using a hot water heating element. The trick with this kind of thing is getting good thermal conductivity to the solution. But you don't want any foreign metal like regular steel or copper in contact with the solution, since it could corrode and contaminate it. That's why people make titanium and quartz heaters. They don't react with the solutions.
I was thinking about a simple temperature sensor (thermocouple) being inserted into a glass pipette which could then be filled with water and sealed with RTV. I'm not sure if that idea would work with a heating element, since the element would try to boil the water around it and that would be a problem.
Ken
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