Jeff,
I live in zone 8b so I keep the water circulating because of the filter needed for my Koi pond.
I fall planted broccoli and carrots that I harvested in February.  No heat other than what the sun provided.
Here is a picture of the revise system, taken about 2 weeks ago.

Hi Paul. Nice set up you have there. I'm in lower Michigan whatever zone that is. I got into aquaponics 2 years ago and never had the desire to dig in the ground but started watching (too many) YouTube videos and was trapped. I patterned my wicking beds after Rob Bob's design. I also have compost beds, a worm farm, 3'x16' raised bed, and am in the middle of a 7'x20' garden for perennial veggies. Not to mention my 8'x20' greenhouse where the aquaponics goes on, at least part of it. The rest is in my basement. I did at least opt to forgo a pond even though with my low backyard I get one after every big rain.

Hi Jeff,
I inherited the pond when we purchased the house.  I have been forced to greatly modify my aquaponic system because I fight algae.  Here in zone 8b we get very few freezing nights so algae will grow even during the winter months.
The floating wicking bags are an attempt to shade the pond as much as I can from the sunlight.  You can see one float with holes where I attempted to do floating growing directly in the pond, with a diaper to keep the fish at bay.  It didn't work because the roots just became coated with algae and the plants did very poorly.  So I switched to the grow bags, filled with a coir mix and a wick into the water.
I use a fake chamois as my wicking material.  I get it locally for $1 for a 2X2' sheet.