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the dc circuit is quite efficient, there is barely (only minimal) any heat loss on the power adapter nor the controller. not enough for sure to make a difference in heating the tank. I used an eheim 1262 for many years and glad to have replaced it with a dc pump. eheim runs hots. I posted a while back the apex temp chart to demonstrate it. I have to cool the tank a lot during summer with eheim pump. fan is ON a lot and results in higher evaporation and not to mention increases humidity, more frequent ATO refill, etc. There is no question in my mind DC pump is better than AC.
jebao return pump is currently the fourth (or is it fifth) generation and each generation has improvements over the previous. I'd say the latest dcp is probably perfect mechanically. controller can probably still see improvement, but that is all just firmware.
I use jebao dcp return pump, dc skimmer, dosing pump, and power head and they all work quite well.
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