I'm not sure many of the folks here have your tank volume. I believe Caswell sells a new heater and controller combo for 15 gallon tanks with an outside electronic controller?
No reason you couldn't use one of Caswell's in your setup. Chances are it would be more cost effective than a custom design.
Alternatively you could probably do the same thing with an off the shelf used temperature controller module and a Caswell heater. You could put the thermocouple in a small glass tube and seal it with RTV. Then you could immerse it in your tank safely. If I go to a larger tank (5 gallons max for me!) this is what I plan to do.
I appreciate that temperature control is somewhat more important than it might seem at first. The resistivity of the solution is very strongly a function of temperature. That's why when people start referencing "volts" between anode and cathode, it is meaningless without knowing first what the tank temperature is.
Ken.
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