Just wondering if any one else has tried these I hooked up 4 of them.
I am actually using a sump pump on a 15 min timer to pause the heating of the water.
So it will pause 15 mins warm up the water then run for 15mins. Seems to work pretty good overall.
Just not sure of it will do any good early in the season in North Dakota.
Here is what a single one looks like I have 4 of them hooked up.