Good point, didn't think of that.
To make things simple it's best to think simplistic. And the simplest way known to heat water is in a pot on a stove, whether wood, gas or electric etc...
Now, a very simplistic stove capable of transferring around 1300-1500-2000 watts of heat to a pot of water is the well known single burner "Hot Plate". Good heavy duty stainless steel "stock pots" are certainly fish and food safe, and readily available. In Aquaponics, it's important both that water circulates/flows throughout the system, and that temperature is pretty homogeneous throughout.
So Chris, couldn't your system be simplified by circulating your water through a stock pot on a hotplate? Food for thought. Hope it helps.
"EE" error displays on most single loop controllers mean that the probe or sensor wiring is either open, or shorted. If you can use a volt/ohm meter, disconnect both probe wires from the controller and measure the conductivity/resistance across them. you should get about 12kohms. or 12000 ohms of resistance. higher to infinity means the wire or probe circuit is broken. much lower than 12k or zero means it is shorted, and the wire or probe is pinched or touching where they shouldn't. temp probes sometimes are polarity sensitive and could fault the controller if reversed. The observance of rapid change while touching the probe is most indicative of a loose or partial open, OR in some cases can indicate that a chemical such as a penetrating oil like wintergreen or spearmint is present. The good news either way is that it is probably not a controller damage issue, but is just the probe or sensor. And those are often standard run of the mill probes that can be replaced with those readily available at electronics supply stores. Kinda like radio shack use to be but still exist as electronic component suppliers in the yellow pages. If you find a store, take your probe and wire to them and ask for advice.
hope this helps.
I was wondering how things were going. I figured no news was good. Spoke too soon.
While you are waiting for the resolution from Amazon, I would say you could put the heater either on a timer, or just plug it in at night and unplug in the morning. Since it is heating quite slowly, I don't imagine you run much risk in overheating the water.
Technical ?'s aside. How are your fish doing? Have they healed?
How are the fish doing?