Differential Thermostat KIT
A Differential Thermostat is actually the same
thing as a Differential Controller when it's used to respond to a temperature
difference. Click on the illustration above to get all the details on the
differential thermostat kit.
You'll get a rough idea of the temperature difference between collector and
storage by measuring the the voltage at J2 pin 2 but if an observation of
the actual temperature of the collector and storage tank are needed an AC/DC
controller would be your best bet.
This Basic Differential Controller is easy to build from a schematic and even easier to build with a KIT and set of instructions. The quarter is not part of the KIT and you'll have to supply your own solder, but I'll throw in a set of thermistors, 4 mounting screws, 4 standoffs and free shipping for $49. If you're going to drive an AC pump you'll need a tiny DC wall transformer to power the controller. I do have have wall transformers but if you have a little 9 Volt Wall transformer laying around you're all set. Here is basically what you get with the basic differential controller:
When mounted the Basic Differential Controller would appear as illustrated above. If you need a differential controller that displays temperature check out the AC/DC Differential Controller
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